feat(nodes): setting the fastest BLE advertising frequency to 1 minute instead of 2

This is motivated by the measure period by the css811 sensor, which is 1 minute and cannot be set to 2.
Hence, we adverstise every minute to avoid trashing half of the measurements

.github/CODEOWNERS

@@ -2,4 +2,4 @@
 /gateway @DjeAvd
 /db/ @Klagarge
 /ui/ @khalil-bot
-/ml @imfeldd
+/model @AlisonLec

.pre-commit-config.yaml

@@ -0,0 +1,9 @@
+repos:
+  - repo: local
+    hooks:
+      - id: swag-init
+        name: swag init
+        entry: bash -c 'export PATH=$PATH:$(go env GOPATH)/bin && cd db/src && swag init'
+        language: system
+        files: ^db/src/.*\.go$
+        pass_filenames: false

db/.env.template

@@ -1,4 +1,10 @@
 INFLUX_PORT=8181
 UI_PORT=8093
+INFLUX_DATABASE=provence
+
+REST_USERNAME=
+REST_PASSWORD=
+
+MQTT_BROKER_URL=tls://mqtt.e.kb28.ch:8883
 MQTT_USERNAME=
 MQTT_PASSWORD=

db/.gitignore

@@ -0,0 +1,28 @@
+### Go template
+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+go.work.sum
+
+# env file
+.env
+
+mapping.json

db/Dockerfile

@@ -0,0 +1,26 @@
+FROM golang:1.25-alpine AS builder
+
+WORKDIR /app
+
+COPY ./src/go.mod ./src/go.sum ./
+RUN go mod tidy
+
+COPY ./src .
+RUN CGO_ENABLED=0 go build -ldflags="-w -s" -o /gateway .
+
+
+FROM alpine:latest AS certs
+RUN apk --no-cache add ca-certificates
+
+FROM scratch AS final
+LABEL   org.opencontainers.image.authors="remi.heredero@hevs.ch" \
+        org.opencontainers.image.title="PI-E2EEDA Gateway MQTT/Influx/REST" \
+        org.opencontainers.image.description="This container is an application for the E2EEDA PI. Use MQTT to communicate with devices, enabling real-time updates and control. Time-series data, such as device states, is stored in InfluxDB for analytics and monitoring. A REST API provides external access for managing devices and retrieving data." \
+        org.opencontainers.image.source="https://github.com/PI-E2EEDA/Plein-de-eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-project"
+
+COPY --from=builder /gateway /gateway
+COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+
+EXPOSE 8080
+
+ENTRYPOINT ["/gateway"]

db/README.md

@@ -1,4 +1,4 @@
-# Deployement
+# Deployment
 
 1. Create the Influx token offline:
 
@@ -18,5 +18,24 @@ cp .env.template .env
 docker compose up -d
 ```
 
+## Development
+
+### Swagger Documentation
+To ensure the Swagger documentation is always up to date, we use [pre-commit](https://pre-commit.com/). It runs `swag init` automatically before each commit if any Go files in `db/src` have changed.
+
+To install the hooks:
+```bash
+pre-commit install
+```
+
+Alternatively, you can run it manually:
+```bash
+pre-commit run --all-files
+```
+or from `db/src`:
+```bash
+swag init
+```
+
 ## Traefik
 A traefik config file is available on [traefik.yml](./traefik.yml). It can be used with an OIDC provider ([Authentik](https://github.com/goauthentik/authentik) in our case) to control access to the database explorer.

db/docker-compose.yml

@@ -12,6 +12,7 @@ services:
         --object-store=file \
         --data-dir=/var/lib/influxdb3/data \
         --admin-token-file=/tmp/admin-token.json \
+        --query-file-limit=1000 \
         --disable-authz=health
       '
     secrets:
@@ -63,6 +64,7 @@ services:
   mqtt:
     image: rabbitmq:4-management-alpine
     container_name: mqtt
+    hostname: "mqtt"
     restart: unless-stopped
     ports:
       - "15672:15672" # Management plugin HTTP port
@@ -74,6 +76,36 @@ services:
       - RABBITMQ_DEFAULT_PASS=${MQTT_PASSWORD:?MQTT_PASSWORD is required}
     command: sh -c "rabbitmq-plugins enable rabbitmq_mqtt && rabbitmq-server"
 
+  gateway:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    depends_on:
+      influxdb:
+        condition: service_healthy
+      mqtt:
+        condition: service_started
+    environment:
+      - MQTT_BROKER_URL=${MQTT_BROKER_URL:-mqtt://mqtt:1883}
+      - MQTT_USERNAME=${MQTT_USERNAME:?MQTT_USERNAME is required}
+      - MQTT_PASSWORD=${MQTT_PASSWORD:?MQTT_PASSWORD is required}
+      - INFLUX_URL=${INFLUX_URL:-http://influxdb:${INFLUX_PORT:-8181}}
+      - INFLUX_DATABASE=${INFLUX_DATABASE}
+      - INFLUX_TOKEN_FILE=/run/secrets/admin-token
+      - REST_PORT=${REST_PORT:-8080}
+      - REST_USERNAME=${REST_USERNAME}
+      - REST_PASSWORD=${REST_PASSWORD}
+      - MAPPING_CONFIG_PATH=/config/mapping.json
+      - CO2_THREASHOLD_MAX=1400
+      - CO2_THREASHOLD_MIN=1000
+    secrets:
+      - admin-token
+    volumes:
+      - ./mapping.json:/config/mapping.json:ro
+    ports:
+      - "${REST_PORT:-8080}:8080"
+    restart: unless-stopped
+
 volumes:
   influxdb3_data:
   rabbitmq_data:

db/export-csv-loop.http

@@ -0,0 +1,49 @@
+@host = localhost:8080
+@username = user
+@password = password
+@from = 2026-05-27T14:00:00+02:00
+@to = 2026-05-27T18:00:00+02:00
+
+### Export CSV - Room A2 - loop over all nodes
+< {%
+  request.variables.set("nodesA2", [
+    {"room": "A2", "mac": "E1:C0:30:15:4E:89"},
+    {"room": "A2", "mac": "C6:7E:0A:DE:DA:74"},
+    {"room": "A2", "mac": "E8:F3:0A:F7:3B:F3"},
+    {"room": "A2", "mac": "C2:64:0F:68:35:3E"},
+    {"room": "A2", "mac": "F5:80:05:76:53:F0"},
+    {"room": "A2", "mac": "C6:95:1B:A6:49:E6"}
+  ])
+%}
+
+GET {{host}}/api/v1/export/csv?node={{$.nodesA2..mac}}&from={{from}}&to={{to}}
+Authorization: Basic {{username}} {{password}}
+
+> {%
+  let current = request.variables.get("nodesA2")[request.iteration()]
+  client.test(`Export CSV - Room ${current.room} - Node ${current.mac}`, () => {
+    client.assert(response.status === 200, `Expected 200, got ${response.status}`)
+  })
+%}
+
+### Export CSV - Room A3 - loop over all nodes
+< {%
+  request.variables.set("nodesA3", [
+    {"room": "A3", "mac": "ED:B2:F3:74:3E:C2"},
+    {"room": "A3", "mac": "CE:25:63:38:34:05"},
+    {"room": "A3", "mac": "E6:8A:79:C8:87:25"},
+    {"room": "A3", "mac": "DC:06:D9:40:7A:CB"},
+    {"room": "A3", "mac": "D5:2F:7E:30:10:5A"},
+    {"room": "A3", "mac": "EA:1A:AD:15:5E:9F"}
+  ])
+%}
+
+GET {{host}}/api/v1/export/csv?node={{$.nodesA3..mac}}&from={{from}}&to={{to}}
+Authorization: Basic {{username}} {{password}}
+
+> {%
+  let current = request.variables.get("nodesA3")[request.iteration()]
+  client.test(`Export CSV - Room ${current.room} - Node ${current.mac}`, () => {
+    client.assert(response.status === 200, `Expected 200, got ${response.status}`)
+  })
+%}

db/get-db.http

@@ -0,0 +1,31 @@
+@host = https://api.db.e.kb28.ch
+@room-id = B3
+@username = PIE2EEDA
+@password =
+
+### GET last value of temp, co2, humidity, windows states
+GET {{host}}/api/v1/rooms/{{room-id}}/current
+Authorization: Basic {{username}} {{password}}
+
+### GET history of a room
+@window = 1 day
+GET {{host}}/api/v1/rooms/{{room-id}}/history?window={{window}}
+Authorization: Basic {{username}} {{password}}
+
+### GET CO2 status of all rooms
+GET {{host}}/api/v1/rooms/high-co2
+Authorization: Basic {{username}} {{password}}
+
+### GET all rooms
+GET {{host}}/api/v1/rooms
+Authorization: Basic {{username}} {{password}}
+
+### GET battery status of all devices
+GET {{host}}/api/v1/battery
+
+### Export sensor data as CSV for a node over a time range
+@node = C2:64:0F:68:35:3E
+@from = 2026-05-27T14:00:00+02:00
+@to = 2026-05-27T18:00:00+02:00
+GET {{host}}/api/v1/export/csv?node={{node}}&from={{from}}&to={{to}}
+Authorization: Basic {{username}} {{password}}

db/mapping.json.template

@@ -0,0 +1,8 @@
+{
+  "campus": {
+    "provence": ["gw-01"]
+  },
+  "room": {
+    "B3": ["E1:C0:30:15:4E:89", "F9:CE:0C:A4:7C:A4"]
+  }
+}

db/src/docs/docs.go

@@ -0,0 +1,337 @@
+// Package docs Code generated by swaggo/swag. DO NOT EDIT
+package docs
+
+import "github.com/swaggo/swag"
+
+const docTemplate = `{
+    "schemes": {{ marshal .Schemes }},
+    "swagger": "2.0",
+    "info": {
+        "description": "{{escape .Description}}",
+        "title": "{{.Title}}",
+        "contact": {},
+        "version": "{{.Version}}"
+    },
+    "host": "{{.Host}}",
+    "basePath": "{{.BasePath}}",
+    "paths": {
+        "/battery": {
+            "get": {
+                "security": [
+                    {
+                        "BasicAuth": []
+                    }
+                ],
+                "description": "Get the last battery level for each node grouped by room",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "battery"
+                ],
+                "summary": "Get last battery level for each node",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": {
+                                "type": "object",
+                                "additionalProperties": {
+                                    "type": "object",
+                                    "additionalProperties": true
+                                }
+                            }
+                        }
+                    },
+                    "500": {
+                        "description": "Internal Server Error",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": {
+                                "type": "string"
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "/export/csv": {
+            "get": {
+                "security": [
+                    {
+                        "BasicAuth": []
+                    }
+                ],
+                "description": "Export CO2, temperature, humidity, window status and battery data for a node over a time range",
+                "produces": [
+                    "text/csv"
+                ],
+                "tags": [
+                    "export"
+                ],
+                "summary": "Export sensor data as CSV",
+                "parameters": [
+                    {
+                        "type": "string",
+                        "description": "Node MAC address (e.g. E8:F3:0A:F7:3B:F3)",
+                        "name": "node",
+                        "in": "query",
+                        "required": true
+                    },
+                    {
+                        "type": "string",
+                        "description": "Start time in RFC3339 format (e.g. 2026-05-27T13:00:00Z)",
+                        "name": "from",
+                        "in": "query",
+                        "required": true
+                    },
+                    {
+                        "type": "string",
+                        "description": "End time in RFC3339 format (e.g. 2026-05-27T15:00:00Z)",
+                        "name": "to",
+                        "in": "query",
+                        "required": true
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "CSV file",
+                        "schema": {
+                            "type": "string"
+                        }
+                    },
+                    "400": {
+                        "description": "Bad Request",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": {
+                                "type": "string"
+                            }
+                        }
+                    },
+                    "500": {
+                        "description": "Internal Server Error",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": {
+                                "type": "string"
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "/rooms": {
+            "get": {
+                "security": [
+                    {
+                        "BasicAuth": []
+                    }
+                ],
+                "description": "Get a list of all unique rooms from the measurement",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "rooms"
+                ],
+                "summary": "Get all unique rooms",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "array",
+                            "items": {
+                                "type": "string"
+                            }
+                        }
+                    },
+                    "500": {
+                        "description": "Internal Server Error",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": {
+                                "type": "string"
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "/rooms/high-co2": {
+            "get": {
+                "security": [
+                    {
+                        "BasicAuth": []
+                    }
+                ],
+                "description": "Get a list of rooms where CO2 levels are above the threshold",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "rooms"
+                ],
+                "summary": "Get rooms with high CO2 levels",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "array",
+                            "items": {
+                                "$ref": "#/definitions/rest.RoomCO2Status"
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "/rooms/{room-id}/current": {
+            "get": {
+                "security": [
+                    {
+                        "BasicAuth": []
+                    }
+                ],
+                "description": "Get the latest record for a specific room",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "rooms"
+                ],
+                "summary": "Get current data for a room",
+                "parameters": [
+                    {
+                        "type": "string",
+                        "description": "Room ID",
+                        "name": "room-id",
+                        "in": "path",
+                        "required": true
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": true
+                        }
+                    },
+                    "404": {
+                        "description": "Not Found",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": {
+                                "type": "string"
+                            }
+                        }
+                    },
+                    "500": {
+                        "description": "Internal Server Error",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": {
+                                "type": "string"
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "/rooms/{room-id}/history": {
+            "get": {
+                "security": [
+                    {
+                        "BasicAuth": []
+                    }
+                ],
+                "description": "Get history for a specific room",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "rooms"
+                ],
+                "summary": "Get history for a room",
+                "parameters": [
+                    {
+                        "type": "string",
+                        "description": "Room ID",
+                        "name": "room-id",
+                        "in": "path",
+                        "required": true
+                    },
+                    {
+                        "type": "string",
+                        "default": "1 day",
+                        "description": "Time window (e.g., 1 day, 1 hour, 30 min)",
+                        "name": "window",
+                        "in": "query"
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "array",
+                            "items": {
+                                "type": "object",
+                                "additionalProperties": true
+                            }
+                        }
+                    },
+                    "500": {
+                        "description": "Internal Server Error",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": {
+                                "type": "string"
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    },
+    "definitions": {
+        "rest.RoomCO2Status": {
+            "type": "object",
+            "properties": {
+                "co2": {
+                    "type": "integer"
+                },
+                "is_high": {
+                    "type": "boolean"
+                },
+                "room": {
+                    "type": "string"
+                }
+            }
+        }
+    },
+    "securityDefinitions": {
+        "BasicAuth": {
+            "type": "basic"
+        }
+    }
+}`
+
+// SwaggerInfo holds exported Swagger Info so clients can modify it
+var SwaggerInfo = &swag.Spec{
+	Version:          "1.0",
+	Host:             "api.db.e.kb28.ch",
+	BasePath:         "/api/v1",
+	Schemes:          []string{},
+	Title:            "Gateway API",
+	Description:      "This is a gateway API for IoT data.",
+	InfoInstanceName: "swagger",
+	SwaggerTemplate:  docTemplate,
+	LeftDelim:        "{{",
+	RightDelim:       "}}",
+}
+
+func init() {
+	swag.Register(SwaggerInfo.InstanceName(), SwaggerInfo)
+}

db/src/docs/swagger.json

@@ -0,0 +1,313 @@
+{
+    "swagger": "2.0",
+    "info": {
+        "description": "This is a gateway API for IoT data.",
+        "title": "Gateway API",
+        "contact": {},
+        "version": "1.0"
+    },
+    "host": "api.db.e.kb28.ch",
+    "basePath": "/api/v1",
+    "paths": {
+        "/battery": {
+            "get": {
+                "security": [
+                    {
+                        "BasicAuth": []
+                    }
+                ],
+                "description": "Get the last battery level for each node grouped by room",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "battery"
+                ],
+                "summary": "Get last battery level for each node",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": {
+                                "type": "object",
+                                "additionalProperties": {
+                                    "type": "object",
+                                    "additionalProperties": true
+                                }
+                            }
+                        }
+                    },
+                    "500": {
+                        "description": "Internal Server Error",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": {
+                                "type": "string"
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "/export/csv": {
+            "get": {
+                "security": [
+                    {
+                        "BasicAuth": []
+                    }
+                ],
+                "description": "Export CO2, temperature, humidity, window status and battery data for a node over a time range",
+                "produces": [
+                    "text/csv"
+                ],
+                "tags": [
+                    "export"
+                ],
+                "summary": "Export sensor data as CSV",
+                "parameters": [
+                    {
+                        "type": "string",
+                        "description": "Node MAC address (e.g. E8:F3:0A:F7:3B:F3)",
+                        "name": "node",
+                        "in": "query",
+                        "required": true
+                    },
+                    {
+                        "type": "string",
+                        "description": "Start time in RFC3339 format (e.g. 2026-05-27T13:00:00Z)",
+                        "name": "from",
+                        "in": "query",
+                        "required": true
+                    },
+                    {
+                        "type": "string",
+                        "description": "End time in RFC3339 format (e.g. 2026-05-27T15:00:00Z)",
+                        "name": "to",
+                        "in": "query",
+                        "required": true
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "CSV file",
+                        "schema": {
+                            "type": "string"
+                        }
+                    },
+                    "400": {
+                        "description": "Bad Request",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": {
+                                "type": "string"
+                            }
+                        }
+                    },
+                    "500": {
+                        "description": "Internal Server Error",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": {
+                                "type": "string"
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "/rooms": {
+            "get": {
+                "security": [
+                    {
+                        "BasicAuth": []
+                    }
+                ],
+                "description": "Get a list of all unique rooms from the measurement",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "rooms"
+                ],
+                "summary": "Get all unique rooms",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "array",
+                            "items": {
+                                "type": "string"
+                            }
+                        }
+                    },
+                    "500": {
+                        "description": "Internal Server Error",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": {
+                                "type": "string"
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "/rooms/high-co2": {
+            "get": {
+                "security": [
+                    {
+                        "BasicAuth": []
+                    }
+                ],
+                "description": "Get a list of rooms where CO2 levels are above the threshold",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "rooms"
+                ],
+                "summary": "Get rooms with high CO2 levels",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "array",
+                            "items": {
+                                "$ref": "#/definitions/rest.RoomCO2Status"
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "/rooms/{room-id}/current": {
+            "get": {
+                "security": [
+                    {
+                        "BasicAuth": []
+                    }
+                ],
+                "description": "Get the latest record for a specific room",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "rooms"
+                ],
+                "summary": "Get current data for a room",
+                "parameters": [
+                    {
+                        "type": "string",
+                        "description": "Room ID",
+                        "name": "room-id",
+                        "in": "path",
+                        "required": true
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": true
+                        }
+                    },
+                    "404": {
+                        "description": "Not Found",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": {
+                                "type": "string"
+                            }
+                        }
+                    },
+                    "500": {
+                        "description": "Internal Server Error",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": {
+                                "type": "string"
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "/rooms/{room-id}/history": {
+            "get": {
+                "security": [
+                    {
+                        "BasicAuth": []
+                    }
+                ],
+                "description": "Get history for a specific room",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "rooms"
+                ],
+                "summary": "Get history for a room",
+                "parameters": [
+                    {
+                        "type": "string",
+                        "description": "Room ID",
+                        "name": "room-id",
+                        "in": "path",
+                        "required": true
+                    },
+                    {
+                        "type": "string",
+                        "default": "1 day",
+                        "description": "Time window (e.g., 1 day, 1 hour, 30 min)",
+                        "name": "window",
+                        "in": "query"
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "array",
+                            "items": {
+                                "type": "object",
+                                "additionalProperties": true
+                            }
+                        }
+                    },
+                    "500": {
+                        "description": "Internal Server Error",
+                        "schema": {
+                            "type": "object",
+                            "additionalProperties": {
+                                "type": "string"
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    },
+    "definitions": {
+        "rest.RoomCO2Status": {
+            "type": "object",
+            "properties": {
+                "co2": {
+                    "type": "integer"
+                },
+                "is_high": {
+                    "type": "boolean"
+                },
+                "room": {
+                    "type": "string"
+                }
+            }
+        }
+    },
+    "securityDefinitions": {
+        "BasicAuth": {
+            "type": "basic"
+        }
+    }
+}

db/src/docs/swagger.yaml

@@ -0,0 +1,201 @@
+basePath: /api/v1
+definitions:
+  rest.RoomCO2Status:
+    properties:
+      co2:
+        type: integer
+      is_high:
+        type: boolean
+      room:
+        type: string
+    type: object
+host: api.db.e.kb28.ch
+info:
+  contact: {}
+  description: This is a gateway API for IoT data.
+  title: Gateway API
+  version: "1.0"
+paths:
+  /battery:
+    get:
+      description: Get the last battery level for each node grouped by room
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            additionalProperties:
+              additionalProperties:
+                additionalProperties: true
+                type: object
+              type: object
+            type: object
+        "500":
+          description: Internal Server Error
+          schema:
+            additionalProperties:
+              type: string
+            type: object
+      security:
+      - BasicAuth: []
+      summary: Get last battery level for each node
+      tags:
+      - battery
+  /export/csv:
+    get:
+      description: Export CO2, temperature, humidity, window status and battery data
+        for a node over a time range
+      parameters:
+      - description: Node MAC address (e.g. E8:F3:0A:F7:3B:F3)
+        in: query
+        name: node
+        required: true
+        type: string
+      - description: Start time in RFC3339 format (e.g. 2026-05-27T13:00:00Z)
+        in: query
+        name: from
+        required: true
+        type: string
+      - description: End time in RFC3339 format (e.g. 2026-05-27T15:00:00Z)
+        in: query
+        name: to
+        required: true
+        type: string
+      produces:
+      - text/csv
+      responses:
+        "200":
+          description: CSV file
+          schema:
+            type: string
+        "400":
+          description: Bad Request
+          schema:
+            additionalProperties:
+              type: string
+            type: object
+        "500":
+          description: Internal Server Error
+          schema:
+            additionalProperties:
+              type: string
+            type: object
+      security:
+      - BasicAuth: []
+      summary: Export sensor data as CSV
+      tags:
+      - export
+  /rooms:
+    get:
+      description: Get a list of all unique rooms from the measurement
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            items:
+              type: string
+            type: array
+        "500":
+          description: Internal Server Error
+          schema:
+            additionalProperties:
+              type: string
+            type: object
+      security:
+      - BasicAuth: []
+      summary: Get all unique rooms
+      tags:
+      - rooms
+  /rooms/{room-id}/current:
+    get:
+      description: Get the latest record for a specific room
+      parameters:
+      - description: Room ID
+        in: path
+        name: room-id
+        required: true
+        type: string
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            additionalProperties: true
+            type: object
+        "404":
+          description: Not Found
+          schema:
+            additionalProperties:
+              type: string
+            type: object
+        "500":
+          description: Internal Server Error
+          schema:
+            additionalProperties:
+              type: string
+            type: object
+      security:
+      - BasicAuth: []
+      summary: Get current data for a room
+      tags:
+      - rooms
+  /rooms/{room-id}/history:
+    get:
+      description: Get history for a specific room
+      parameters:
+      - description: Room ID
+        in: path
+        name: room-id
+        required: true
+        type: string
+      - default: 1 day
+        description: Time window (e.g., 1 day, 1 hour, 30 min)
+        in: query
+        name: window
+        type: string
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            items:
+              additionalProperties: true
+              type: object
+            type: array
+        "500":
+          description: Internal Server Error
+          schema:
+            additionalProperties:
+              type: string
+            type: object
+      security:
+      - BasicAuth: []
+      summary: Get history for a room
+      tags:
+      - rooms
+  /rooms/high-co2:
+    get:
+      description: Get a list of rooms where CO2 levels are above the threshold
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            items:
+              $ref: '#/definitions/rest.RoomCO2Status'
+            type: array
+      security:
+      - BasicAuth: []
+      summary: Get rooms with high CO2 levels
+      tags:
+      - rooms
+securityDefinitions:
+  BasicAuth:
+    type: basic
+swagger: "2.0"

db/src/go.mod

@@ -0,0 +1,71 @@
+module gateway
+
+go 1.25.0
+
+require (
+	github.com/InfluxCommunity/influxdb3-go/v2 v2.13.0
+	github.com/eclipse/paho.mqtt.golang v1.5.1
+	github.com/gin-contrib/cors v1.7.2
+	github.com/gin-gonic/gin v1.12.0
+	github.com/swaggo/files v1.0.1
+	github.com/swaggo/gin-swagger v1.6.1
+	github.com/swaggo/swag v1.16.4
+)
+
+require (
+	github.com/KyleBanks/depth v1.2.1 // indirect
+	github.com/PuerkitoBio/purell v1.1.1 // indirect
+	github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect
+	github.com/apache/arrow-go/v18 v18.5.1 // indirect
+	github.com/bytedance/gopkg v0.1.3 // indirect
+	github.com/bytedance/sonic v1.15.0 // indirect
+	github.com/bytedance/sonic/loader v0.5.0 // indirect
+	github.com/cloudwego/base64x v0.1.6 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.12 // indirect
+	github.com/gin-contrib/sse v1.1.0 // indirect
+	github.com/go-openapi/jsonpointer v0.19.5 // indirect
+	github.com/go-openapi/jsonreference v0.19.6 // indirect
+	github.com/go-openapi/spec v0.20.4 // indirect
+	github.com/go-openapi/swag v0.19.15 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.30.1 // indirect
+	github.com/goccy/go-json v0.10.5 // indirect
+	github.com/goccy/go-yaml v1.19.2 // indirect
+	github.com/google/flatbuffers v25.12.19+incompatible // indirect
+	github.com/gorilla/websocket v1.5.3 // indirect
+	github.com/influxdata/line-protocol/v2 v2.2.1 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/compress v1.18.2 // indirect
+	github.com/klauspost/cpuid/v2 v2.3.0 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mailru/easyjson v0.7.6 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
+	github.com/pierrec/lz4/v4 v4.1.23 // indirect
+	github.com/quic-go/qpack v0.6.0 // indirect
+	github.com/quic-go/quic-go v0.59.0 // indirect
+	github.com/rogpeppe/go-internal v1.14.1 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.3.1 // indirect
+	github.com/zeebo/xxh3 v1.0.2 // indirect
+	go.mongodb.org/mongo-driver/v2 v2.5.0 // indirect
+	golang.org/x/arch v0.22.0 // indirect
+	golang.org/x/crypto v0.48.0 // indirect
+	golang.org/x/exp v0.0.0-20250408133849-7e4ce0ab07d0 // indirect
+	golang.org/x/mod v0.32.0 // indirect
+	golang.org/x/net v0.51.0 // indirect
+	golang.org/x/sync v0.19.0 // indirect
+	golang.org/x/sys v0.41.0 // indirect
+	golang.org/x/telemetry v0.0.0-20260109210033-bd525da824e2 // indirect
+	golang.org/x/text v0.34.0 // indirect
+	golang.org/x/tools v0.41.0 // indirect
+	golang.org/x/xerrors v0.0.0-20240903120638-7835f813f4da // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217 // indirect
+	google.golang.org/grpc v1.79.3 // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)

db/src/go.sum

@@ -0,0 +1,258 @@
+github.com/InfluxCommunity/influxdb3-go/v2 v2.13.0 h1:IQVpiJ0t92OsJXf/RJ0+HHoIbK3mgJaMntEfLRgxS9Q=
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+github.com/KyleBanks/depth v1.2.1 h1:5h8fQADFrWtarTdtDudMmGsC7GPbOAu6RVB3ffsVFHc=
+github.com/KyleBanks/depth v1.2.1/go.mod h1:jzSb9d0L43HxTQfT+oSA1EEp2q+ne2uh6XgeJcm8brE=
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+github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
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+github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
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db/src/influx/influx.go

@@ -0,0 +1,96 @@
+// Package influx provides an abstraction to the client influx.
+package influx
+
+import (
+	"context"
+	datapoint "gateway/point"
+
+	"github.com/InfluxCommunity/influxdb3-go/v2/influxdb3"
+	"github.com/InfluxCommunity/influxdb3-go/v2/influxdb3/batching"
+)
+
+const BatchSize = 50     // Number of points to batch before pushing to InfluxDB
+const BatchCapacity = 50 // Capacity maximum of the buffer
+
+// Gateway provides the abstraction of all gateways to send data points
+type Gateway interface {
+	AddDatapoint(dp datapoint.DataPointInfo) error
+	Close() error
+	Flush() error
+	Query(ctx context.Context, query string) (*influxdb3.QueryIterator, error)
+}
+
+// An InfluxGateway is the abstracted influx gateway.
+// It provides the influx parameters to initialize the connection
+// and the batcher to batch the points before pushing to Influx.
+type InfluxGateway struct {
+	client  *influxdb3.Client
+	batcher *batching.Batcher
+}
+
+// NewInfluxGateway creates a new InfluxGateway with the given parameters.
+func NewInfluxGateway(url string, token string, database string) (*InfluxGateway, error) {
+
+	client, err := influxdb3.New(influxdb3.ClientConfig{
+		Host:     url,
+		Token:    token,
+		Database: database,
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &InfluxGateway{
+		client: client,
+		batcher: batching.NewBatcher(
+			batching.WithSize(BatchSize),
+			batching.WithInitialCapacity(BatchCapacity),
+		),
+	}, nil
+}
+
+// AddDatapoint is used to add a datapoint in the batcher. It uses the
+// DataPointInfo interface for abstracting the generic type of the DataPoint.
+// It pushes the batch of point when the number of points >= batch size.
+func (g *InfluxGateway) AddDatapoint(dp datapoint.DataPointInfo) error {
+
+	tagsList := map[string]string{}
+	for _, t := range dp.Tags() {
+		tagsList[t.Subject] = t.Content
+	}
+	g.batcher.Add(
+		influxdb3.NewPoint(
+			dp.MeasurementName(),
+			tagsList,
+			dp.PayloadAsAny(),
+			dp.Timestamp(),
+		),
+	)
+
+	// if not ready, we are done
+	if g.batcher.Ready() {
+		return nil
+	}
+
+	// If ready, flush and return the result directly
+	return g.Flush()
+}
+
+// Flush sends the current batch of points to InfluxDB.
+func (g *InfluxGateway) Flush() error {
+	// Send batch to influx DB
+	err := g.client.WritePoints(context.Background(), g.batcher.Emit())
+
+	return err
+}
+
+// Close closes the InfluxGateway client.
+func (g *InfluxGateway) Close() error {
+	return g.client.Close()
+}
+
+// Query executes a SQL query against InfluxDB using the Arrow Flight (gRPC) API.
+func (g *InfluxGateway) Query(ctx context.Context, query string) (*influxdb3.QueryIterator, error) {
+	return g.client.Query(ctx, query)
+}

db/src/main.go

@@ -0,0 +1,195 @@
+package main
+
+import (
+	"fmt"
+	"gateway/influx"
+	"gateway/mqtt"
+	point "gateway/point"
+	"gateway/rest"
+	"log"
+	"os"
+	"slices"
+	"strings"
+	"time"
+)
+
+func getEnv(key, fallback string) string {
+	if value := os.Getenv(key); value != "" {
+		return value
+	}
+	return fallback
+}
+
+type ProvenceData struct {
+	CO2PPM   int     `json:"co2_ppm"`
+	Temp     float64 `json:"temp"`
+	Humidity int     `json:"humidity"`
+	Battery  int     `json:"battery"`
+	Window   bool    `json:"window_open"`
+}
+
+func mqttConnection() *mqtt.MqttGateway {
+	BrokerUrl := getEnv("MQTT_BROKER_URL", "tls://localhost:8883")
+	Username := getEnv("MQTT_USERNAME", "user")
+	Password := getEnv("MQTT_PASSWORD", "password")
+
+	ClientId := "mqtt-gateway-test-client_" + fmt.Sprint(time.Now().Unix())
+
+	// Create config & gateway
+	mqttP := &mqtt.MqttParams{
+		Broker:           BrokerUrl,
+		ClientId:         ClientId,
+		Qos:              1,
+		Username:         Username,
+		Password:         Password,
+		TlsConfig:        nil,
+		OnConnect:        nil,
+		OnConnectionLost: nil,
+		Timeout:          1 * time.Second,
+	}
+	gateway, err := mqtt.NewMqttGateway(*mqttP)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	return gateway
+}
+
+func influxConnection() *influx.InfluxGateway {
+	influxUrl := getEnv("INFLUX_URL", "http://influxdb:8181")
+
+	influxDatabase := getEnv("INFLUX_DATABASE", "provence")
+	influxToken := getEnv("INFLUX_TOKEN", "")
+	if influxToken == "" {
+		if tokenFile := getEnv("INFLUX_TOKEN_FILE", "/run/secrets/admin-token"); tokenFile != "" {
+			content, err := os.ReadFile(tokenFile)
+			if err == nil {
+				influxToken = strings.TrimSpace(string(content))
+			} else {
+				log.Printf("[Main] Warning: could not read token file %s: %v\n", tokenFile, err)
+			}
+		}
+	}
+
+	if influxToken == "" {
+		influxToken = "password"
+	}
+
+	log.Printf("[Main] InfluxDB config: URL=%s, DB=%s\n", influxUrl, influxDatabase)
+
+	// Create the gateway
+	gateway, err := influx.NewInfluxGateway(influxUrl, influxToken, influxDatabase)
+	if err != nil {
+		log.Fatalf("Creating gateway failed !, %v", err)
+	}
+
+	return gateway
+}
+
+// @title Gateway API
+// @version 1.0
+// @description This is a gateway API for IoT data.
+// @host api.db.e.kb28.ch
+// @BasePath /api/v1
+// @securityDefinitions.basic BasicAuth
+func main() {
+	noMqtt := slices.Contains(os.Args[1:], "--no-mqtt")
+
+	// Load mapping configuration (reloaded dynamically on each access)
+	mappingPath := getEnv("MAPPING_CONFIG_PATH", "mapping.json")
+	mapping := NewDynamicMapping(mappingPath)
+
+	influxGateway := influxConnection()
+	defer influxGateway.Close()
+
+	measurementName := getEnv("CAMPUS", "provence")
+
+	if !noMqtt {
+		mqttGateway := mqttConnection()
+		defer mqttGateway.Disconnect()
+
+		// Create measurement for provence topic
+		provenceMeasurement := point.CreateMeasurement[ProvenceData](measurementName)
+		// The incoming MQTT topic structure is: <gateway_id>/<node_id>/update
+		topicStructur := []string{"gateway", "node"}
+		err := mqtt.SubscribeTyped(mqttGateway, "+/+/update", provenceMeasurement, topicStructur, func(dp point.DataPoint[ProvenceData]) {
+			var gatewayID, nodeID string
+			for _, tag := range dp.Tags() {
+				switch tag.Subject {
+				case "gateway":
+					gatewayID = tag.Content
+				case "node":
+					nodeID = tag.Content
+				}
+			}
+
+			campus, campusOk := mapping.GetCampus(gatewayID)
+			room, roomOk := mapping.GetRoom(nodeID)
+
+			batteryLevel := dp.GetValues().Battery
+			log.Printf("[Main] Received gateway=%s node=%s -> campus=%s room=%s (Battery %d%%)\n", gatewayID, nodeID, campus, room, batteryLevel)
+
+			var influxTags []point.Topic
+
+			if !campusOk {
+				log.Printf("[Main] No mapping found for gateway=%s\n", gatewayID)
+				influxTags = []point.Topic{
+					{Subject: "node", Content: nodeID},
+				}
+			} else if !roomOk {
+				log.Printf("[Main] No mapping found for gateway=%s\n", gatewayID)
+				influxTags = []point.Topic{
+					{Subject: "campus", Content: campus},
+					{Subject: "node", Content: nodeID},
+				}
+			} else {
+				influxTags = []point.Topic{
+					{Subject: "campus", Content: campus},
+					{Subject: "room", Content: room},
+					{Subject: "node", Content: nodeID},
+				}
+			}
+
+			// If CO2PPM value is present and over 1,000,000,000 delete the field, it's calibration value
+			values := dp.GetValues()
+			if values.CO2PPM > 1000000000 {
+				log.Printf("[Main] Warning: CO2PPM value %d is calibrating, setting to 0\n", values.CO2PPM)
+				values.CO2PPM = 0
+			}
+
+			// Still too high value, something wrong, dropping datapoint
+			if values.CO2PPM > 10000 {
+				log.Printf("[Main] Error: CO2PPM value %d is over threshold, dropping Datapoint\n", values.CO2PPM)
+				return
+			}
+
+			translatedDp := provenceMeasurement.CreateDataPoint(influxTags, values, dp.Timestamp())
+
+			if err := influxGateway.AddDatapoint(&translatedDp); err != nil {
+				log.Printf("[Main] Error adding datapoint to influx: %v\n", err)
+			}
+			if err := influxGateway.Flush(); err != nil {
+				log.Printf("[Main] Error flushing to influx: %v\n", err)
+			}
+		})
+		if err != nil {
+			log.Fatal(err)
+		}
+	} else {
+		log.Println("[Main] MQTT disabled (--no-mqtt flag set)")
+	}
+
+	// Initialize and start REST Gateway
+	restUsername := getEnv("REST_USERNAME", "user")
+	restPassword := getEnv("REST_PASSWORD", "password")
+	restGateway := rest.NewRestGateway(influxGateway, mapping, measurementName, restUsername, restPassword)
+
+	port := getEnv("REST_PORT", "8080")
+
+	log.Printf("[Main] Starting REST Gateway on port %s\n", port)
+	if err := restGateway.Run(":" + port); err != nil {
+		log.Fatalf("[Main] Failed to start REST Gateway: %v", err)
+	}
+
+	select {}
+}

db/src/mapping.go

@@ -0,0 +1,152 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+)
+
+// mappingFile is the structure of the JSON config file.
+// Campus names map to the list of gateway IDs that belong to them.
+// Room names map to the list of node IDs that belong to them.
+type mappingFile struct {
+	Campus map[string][]string `json:"campus"`
+	Room   map[string][]string `json:"room"`
+}
+
+// MappingConfig holds the reverse lookup maps built from the config file:
+//
+//	gateway_id -> campus name
+//	node_id    -> room name
+type MappingConfig struct {
+	gatewayToCampus map[string]string
+	nodeToRoom      map[string]string
+}
+
+// DynamicMapping reloads the mapping file on every access so that changes
+// to the JSON file take effect without restarting the programme.
+type DynamicMapping struct {
+	path string
+}
+
+// NewDynamicMapping creates a DynamicMapping that reads from the given path.
+func NewDynamicMapping(path string) *DynamicMapping {
+	return &DynamicMapping{path: path}
+}
+
+func (d *DynamicMapping) load() *MappingConfig {
+	cfg, err := LoadMapping(d.path)
+	if err != nil {
+		return EmptyMapping()
+	}
+	return cfg
+}
+
+func (d *DynamicMapping) GetCampus(gatewayID string) (string, bool) {
+	return d.load().GetCampus(gatewayID)
+}
+
+func (d *DynamicMapping) GetRoom(nodeID string) (string, bool) {
+	return d.load().GetRoom(nodeID)
+}
+
+func (d *DynamicMapping) NodesForRoom(room string) []string {
+	return d.load().NodesForRoom(room)
+}
+
+func (d *DynamicMapping) AllNodes() []string {
+	return d.load().AllNodes()
+}
+
+func (d *DynamicMapping) Rooms() []string {
+	return d.load().Rooms()
+}
+
+// EmptyMapping returns a MappingConfig with no entries.
+// GetCampus and GetRoom will return their "unknown_*" fallback values.
+func EmptyMapping() *MappingConfig {
+	return &MappingConfig{
+		gatewayToCampus: make(map[string]string),
+		nodeToRoom:      make(map[string]string),
+	}
+}
+
+// LoadMapping reads the mapping configuration from a JSON file and builds
+// the internal reverse-lookup tables.
+func LoadMapping(path string) (*MappingConfig, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read mapping file %q: %w", path, err)
+	}
+
+	var raw mappingFile
+	if err := json.Unmarshal(data, &raw); err != nil {
+		return nil, fmt.Errorf("failed to parse mapping JSON: %w", err)
+	}
+
+	cfg := &MappingConfig{
+		gatewayToCampus: make(map[string]string),
+		nodeToRoom:      make(map[string]string),
+	}
+
+	for campus, gateways := range raw.Campus {
+		for _, gwID := range gateways {
+			cfg.gatewayToCampus[gwID] = campus
+		}
+	}
+
+	for room, nodes := range raw.Room {
+		for _, nodeID := range nodes {
+			cfg.nodeToRoom[nodeID] = room
+		}
+	}
+
+	return cfg, nil
+}
+
+// GetCampus returns the campus name for a given gateway ID.
+// The boolean is false if the gateway ID has no mapping.
+func (c *MappingConfig) GetCampus(gatewayID string) (string, bool) {
+	campus, ok := c.gatewayToCampus[gatewayID]
+	return campus, ok
+}
+
+// GetRoom returns the room name for a given node ID.
+// The boolean is false if the node ID has no mapping.
+func (c *MappingConfig) GetRoom(nodeID string) (string, bool) {
+	room, ok := c.nodeToRoom[nodeID]
+	return room, ok
+}
+
+// NodesForRoom returns the list of node IDs that belong to the given room.
+func (c *MappingConfig) NodesForRoom(room string) []string {
+	var nodes []string
+	for nodeID, r := range c.nodeToRoom {
+		if r == room {
+			nodes = append(nodes, nodeID)
+		}
+	}
+	return nodes
+}
+
+// AllNodes returns all node IDs defined in the mapping.
+func (c *MappingConfig) AllNodes() []string {
+	nodes := make([]string, 0, len(c.nodeToRoom))
+	for nodeID := range c.nodeToRoom {
+		nodes = append(nodes, nodeID)
+	}
+	return nodes
+}
+
+// Rooms returns the list of all room names defined in the mapping.
+func (c *MappingConfig) Rooms() []string {
+	seen := make(map[string]struct{})
+	for _, room := range c.nodeToRoom {
+		seen[room] = struct{}{}
+	}
+	rooms := make([]string, 0, len(seen))
+	for room := range seen {
+		rooms = append(rooms, room)
+	}
+	return rooms
+}

db/src/mqtt/mqtt.go

@@ -0,0 +1,248 @@
+// Package mqtt_gateway provides an abstraction to an MQTT broker client.
+package mqtt
+
+import (
+	"crypto/tls"
+	"encoding/json"
+	"errors"
+	"fmt"
+	dp "gateway/point"
+	"log"
+	"strings"
+	"time"
+
+	mqtt "github.com/eclipse/paho.mqtt.golang"
+)
+
+const (
+	maxQoS       	= 2
+	defaultTimeout	= 5 * time.Second
+)
+
+// A MqttParams is the abstracted MQTT gateway.
+// It provides the MQTT parameters to initialize the connection and the method to add data.
+type MqttParams struct {
+	Broker           string
+	ClientId         string
+	Qos              byte
+	Username         string
+	Password         string
+	TlsConfig        *tls.Config
+	OnConnect        mqtt.OnConnectHandler
+	OnConnectionLost mqtt.ConnectionLostHandler
+	Timeout          time.Duration
+}
+
+// MqttGateway is the abstracted MQTT gateway.
+// It connects to the MQTT broker and provides the method to send data to the broker.
+type MqttGateway struct {
+	MqttParams MqttParams
+	Client     mqtt.Client
+}
+
+// mqttPayload is the JSON structure published to the broker in a specific topic.
+// It contains the values and the timestamp of the data.
+type mqttPayload map[string]any
+
+// connectHandler is called when the client connects to the broker. It prints a message to the console.
+var connectHandler mqtt.OnConnectHandler = func(client mqtt.Client) {
+	log.Println("[MQTT Gateway] Connected to MQTT Broker")
+}
+
+// connectLostHandler is called when the client loses connection to the broker. It prints a message to the console with the error.
+var connectLostHandler mqtt.ConnectionLostHandler = func(client mqtt.Client, err error) {
+	log.Printf("[MQTT Gateway] Connection lost: %v\n", err)
+}
+
+func getTopic(t []dp.Topic) string {
+	var topic []string
+	for _, t := range t {
+		topic = append(topic, t.Content)
+	}
+	return strings.Join(topic, "/")
+}
+
+// NewMqttGateway creates a new MqttGateway with the given parameters.
+// And establishes the connection
+func NewMqttGateway(p MqttParams) (*MqttGateway, error) {
+	// Verify input variable
+	if p.Broker == "" {
+		return nil, errors.New("[MQTT Gateway] Invalid broker address")
+	}
+
+	if p.ClientId == "" {
+		return nil, errors.New("[MQTT Gateway] Invalid client id")
+	}
+
+	if p.Qos > maxQoS {
+		return nil, errors.New("[MQTT Gateway] Invalid QoS level")
+	}
+
+	if p.Timeout == 0 {
+		// Set to default value
+		p.Timeout = defaultTimeout
+	}
+
+	opts := mqtt.NewClientOptions()
+	opts.AddBroker(p.Broker)
+	opts.SetClientID(p.ClientId)
+
+	if p.TlsConfig != nil {
+		opts.SetTLSConfig(p.TlsConfig)
+	}
+
+	if p.OnConnect != nil {
+		opts.SetOnConnectHandler(p.OnConnect)
+	} else {
+		opts.SetOnConnectHandler(connectHandler)
+	}
+
+	if p.OnConnectionLost != nil {
+		opts.SetConnectionLostHandler(p.OnConnectionLost)
+	} else {
+		opts.SetConnectionLostHandler(connectLostHandler)
+	}
+
+	if p.Username != "" {
+		opts.SetUsername(p.Username)
+		opts.SetPassword(p.Password)
+	}
+
+	client := mqtt.NewClient(opts)
+	token := client.Connect()
+	if !token.WaitTimeout(p.Timeout) {
+		return nil, fmt.Errorf("[MQTT Gateway] Mqtt connect timed out")
+	}
+	if err := token.Error(); err != nil {
+		return nil, fmt.Errorf("[MQTT Gateway] Mqtt connect failed: %w", err)
+	}
+
+	return &MqttGateway{
+		MqttParams: p,
+		Client:     client,
+	}, nil
+}
+
+// SendData is used to send data in the MQTT gateway.
+// It uses the DataPointInfo interface for abstracting the generic type of the DataPoint
+func (g *MqttGateway) SendData(msg dp.DataPointInfo) error {
+
+	topic := getTopic(msg.Tags())
+	if topic == "" {
+		return errors.New("[MQTT Gateway] Invalid topic")
+	}
+
+	payload := mqttPayload{
+		"timestamp": msg.Timestamp().Unix(),
+	}
+
+	for key, value := range msg.PayloadAsAny() {
+		payload[key] = value
+	}
+
+	payloadJson, err := json.Marshal(payload)
+	if err != nil {
+		return fmt.Errorf("[MQTT Gateway] Failed to marshal payload: %w", err)
+	}
+
+	token := g.Client.Publish(topic, g.MqttParams.Qos, false, payloadJson)
+	if !token.WaitTimeout(g.MqttParams.Timeout) {
+		return fmt.Errorf("[MQTT Gateway] Mqtt connect timed out")
+	}
+	if token.Error() != nil {
+		return fmt.Errorf("[MQTT Gateway] Failed to publish message: %w", token.Error())
+	}
+
+	return nil
+}
+
+// Disconnect is used to disconnect the MQTT gateway from the broker.
+// It prints a message to the console when the disconnection is successful.
+func (g *MqttGateway) Disconnect() {
+	g.Client.Disconnect(0)
+	log.Println("[MQTT Gateway] Disconnected from MQTT Broker")
+}
+
+// Subscribe is used to subscribe to a topic in the MQTT gateway.
+// It takes a topic and a callback function as parameters.
+// The callback function is called when a message is received on the subscribed topic.
+func (g *MqttGateway) Subscribe(topic string, callback mqtt.MessageHandler) error {
+	token := g.Client.Subscribe(topic, g.MqttParams.Qos, callback)
+	if !token.WaitTimeout(g.MqttParams.Timeout) {
+		return fmt.Errorf("[MQTT Gateway] MQTT gateway timed out")
+	}
+	if token.Error() != nil {
+		return fmt.Errorf("[MQTT Gateway] MQTT gateway failed to subscribe: %w", token.Error())
+	}
+
+	log.Printf("[MQTT Gateway] Subscribed to topic: %s\n", topic)
+	return nil
+}
+
+// Unsubscribe is used to unsubscribe from a topic in the MQTT gateway.
+func (g *MqttGateway) Unsubscribe(topic string) error {
+	token := g.Client.Unsubscribe(topic)
+	if !token.WaitTimeout(g.MqttParams.Timeout) {
+		return fmt.Errorf("[MQTT Gateway] MQTT gateway timed out")
+	}
+	if token.Error() != nil {
+		return fmt.Errorf("[MQTT Gateway] MQTT gateway failed to unsubscribe: %w", token.Error())
+	}
+
+	log.Printf("[MQTT Gateway] Unsubscribed from topic: %s\n", topic)
+	return nil
+}
+
+// SubscribeTyped is a helper to subscribe to a topic and automatically convert
+// the received JSON message to a DataPoint of type T.
+// T should be a struct or a map that matches the JSON payload (excluding timestamp).
+// tagSubjects is a list of tag subjects that correspond to the parts of the topic.
+// For example, if the topic is "provence/B3/update" and tagSubjects is ["city", "room"],
+// it will create tags {Subject: "city", Content: "provence"} and {Subject: "room", Content: "B3"}.
+func SubscribeTyped[T any](g *MqttGateway, topic string, m dp.Measurement[T], tagSubjects []string, handler func(dp.DataPoint[T])) error {
+	return g.Subscribe(topic, func(client mqtt.Client, msg mqtt.Message) {
+		// Unmarshal into T for fields
+		var fields T
+		if err := json.Unmarshal(msg.Payload(), &fields); err != nil {
+			log.Printf("[MQTT Gateway] Error unmarshaling fields: %v", err)
+			return
+		}
+
+		// Unmarshal into a map to extract timestamp
+		var raw map[string]any
+		if err := json.Unmarshal(msg.Payload(), &raw); err != nil {
+			log.Printf("[MQTT Gateway] Error unmarshaling raw: %v", err)
+			return
+		}
+
+		ts := time.Now()
+		if tsRaw, ok := raw["timestamp"].(string); ok {
+			// Try RFC3339 first (default)
+			if parsedTs, err := time.Parse(time.RFC3339, tsRaw); err == nil {
+				ts = parsedTs
+			} else {
+				log.Printf("[MQTT Gateway] Failed to parse timestamp '%s' as RFC3339: %v", tsRaw, err)
+			}
+		} else if tsRaw, ok := raw["timestamp"].(float64); ok {
+			// Handle Unix timestamp in seconds
+			ts = time.Unix(int64(tsRaw), 0)
+		}
+
+		// Extract tags from topic
+		parts := strings.Split(msg.Topic(), "/")
+		var tags []dp.Topic
+		for i, subject := range tagSubjects {
+			if i < len(parts) && subject != "" {
+				tags = append(tags, dp.Topic{Subject: subject, Content: parts[i]})
+			}
+		}
+
+		// Fallback for backward compatibility if no tagSubjects provided
+		if len(tagSubjects) == 0 && len(parts) > 1 {
+			tags = append(tags, dp.Topic{Subject: "id", Content: parts[1]})
+		}
+
+		dp := m.CreateDataPoint(tags, fields, ts)
+		handler(dp)
+	})
+}

db/src/point/datapoint.go

@@ -0,0 +1,82 @@
+// Package datapoint implements measurement and datapoint
+// for database gateways.
+package datapoint
+
+import (
+	"encoding/json"
+	"time"
+)
+
+type Topic struct {
+	Subject string
+	Content string
+}
+
+// DataPointInfo provides an interface for accessing
+// all fields of a DataPoint.
+type DataPointInfo interface {
+	MeasurementName() string
+	Tags() []Topic
+	PayloadAsAny() map[string]any
+	Timestamp() time.Time
+}
+
+// A Measurement represents a type of measurement such as
+// temperature, humidity, ...
+type Measurement[T any] struct {
+	name string
+}
+
+// A DataPoint represents values associated with a measurement, along with tags,
+// values, and a timestamp. It contains a pointer to its parent Measurement
+type DataPoint[T any] struct {
+	measurement *Measurement[T]
+	tags        []Topic
+	values      T
+	timestamp   time.Time
+}
+
+func CreateMeasurement[T any](name string) Measurement[T] {
+	return Measurement[T]{
+		name: name,
+	}
+}
+
+// CreateDataPoint forces the creation of DataPoint with the type according
+// to the generic.
+func (m *Measurement[T]) CreateDataPoint(tags []Topic, values T, timestamp time.Time) DataPoint[T] {
+	return DataPoint[T]{
+		measurement: m,
+		tags:        tags,
+		values:      values,
+		timestamp:   timestamp,
+	}
+}
+
+func (dp *DataPoint[T]) MeasurementName() string {
+	return dp.measurement.name
+}
+
+func (dp *DataPoint[T]) Tags() []Topic {
+	return dp.tags
+}
+
+func (dp *DataPoint[T]) GetValues() T {
+	return dp.values
+}
+
+// PayloadAsAny returns the DataPoint value with type any.
+// (useful for adding the DataPoint for batching)
+func (dp *DataPoint[T]) PayloadAsAny() map[string]any {
+	b, err := json.Marshal(dp.values)
+	if err != nil {
+		return nil
+	}
+	var res map[string]any
+	_ = json.Unmarshal(b, &res)
+	return res
+}
+
+func (dp *DataPoint[T]) Timestamp() time.Time {
+	return dp.timestamp
+}

db/src/rest/rest.go

@@ -0,0 +1,598 @@
+package rest
+
+import (
+	"context"
+	"encoding/csv"
+	"fmt"
+	_ "gateway/docs"
+	"gateway/influx"
+	"log"
+	"net/http"
+	"os"
+	"regexp"
+	"slices"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/apache/arrow-go/v18/arrow"
+	"github.com/gin-contrib/cors"
+	"github.com/gin-gonic/gin"
+	swaggerFiles "github.com/swaggo/files"
+	ginSwagger "github.com/swaggo/gin-swagger"
+)
+
+// RoomMapper is an interface for mapping node IDs to rooms and listing rooms.
+type RoomMapper interface {
+	Rooms() []string
+	NodesForRoom(room string) []string
+	AllNodes() []string
+	GetRoom(nodeID string) (string, bool)
+}
+
+type RestGateway struct {
+	influxGateway   *influx.InfluxGateway
+	mapping         RoomMapper
+	engine          *gin.Engine
+	measurementName string
+	username        string
+	password        string
+	co2ThresholdMax int
+	co2ThresholdMin int
+	roomStatus      map[string]*RoomCO2Status
+	statusMu        sync.RWMutex
+}
+
+type RoomCO2Status struct {
+	RoomID string `json:"room"`
+	IsHigh bool   `json:"is_high"`
+	CO2    int    `json:"co2"`
+}
+
+func NewRestGateway(influxGateway *influx.InfluxGateway, mapping RoomMapper, measurementName string, username, password string) *RestGateway {
+	maxThreshold, _ := strconv.Atoi(os.Getenv("CO2_THREASHOLD_MAX"))
+	if maxThreshold == 0 {
+		maxThreshold = 1400
+	}
+	minThreshold, _ := strconv.Atoi(os.Getenv("CO2_THREASHOLD_MIN"))
+	if minThreshold == 0 {
+		minThreshold = 1000
+	}
+
+	g := &RestGateway{
+		influxGateway:   influxGateway,
+		mapping:         mapping,
+		engine:          gin.Default(),
+		measurementName: measurementName,
+		username:        username,
+		password:        password,
+		co2ThresholdMax: maxThreshold,
+		co2ThresholdMin: minThreshold,
+		roomStatus:      make(map[string]*RoomCO2Status),
+	}
+
+	g.setupRoutes()
+	go g.runWatchdog()
+	return g
+}
+
+func (g *RestGateway) setupRoutes() {
+	// Setup CORS middleware to allow all *.e.kb28.ch origins
+	corsConfig := cors.Config{
+		AllowOriginFunc: func(origin string) bool {
+			// Match any origin like *.e.kb28.ch
+			pattern := regexp.MustCompile(`^https://.*\.e\.kb28\.ch$`)
+			return pattern.MatchString(origin)
+		},
+		AllowMethods:     []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
+		AllowHeaders:     []string{"Origin", "Authorization", "Content-Type"},
+		ExposeHeaders:    []string{"Content-Length"},
+		AllowCredentials: true,
+	}
+	g.engine.Use(cors.New(corsConfig))
+
+	v1 := g.engine.Group("/api/v1")
+
+	// Public endpoints (no auth required)
+	v1.GET("/battery", g.getBattery)
+
+	if g.username != "" && g.password != "" {
+		v1.Use(gin.BasicAuth(gin.Accounts{
+			g.username: g.password,
+		}))
+	}
+
+	{
+		v1.GET("/rooms", g.getRooms)
+		v1.GET("/rooms/:room-id/current", g.getRoomCurrent)
+		v1.GET("/rooms/:room-id/history", g.getRoomHistory)
+		v1.GET("/rooms/high-co2", g.getHighCO2Rooms)
+		v1.GET("/export/csv", g.getExportCSV)
+	}
+
+	g.engine.GET("/swagger/*any", ginSwagger.WrapHandler(swaggerFiles.Handler))
+}
+
+// buildNodeFilter builds a SQL WHERE clause fragment matching any of the given node IDs.
+func buildNodeFilter(nodes []string) string {
+	quotedNodes := make([]string, len(nodes))
+	for i, n := range nodes {
+		quotedNodes[i] = fmt.Sprintf("'%s'", n)
+	}
+	return fmt.Sprintf(`"node" IN (%s)`, strings.Join(quotedNodes, ", "))
+}
+
+// GET /api/v1/battery
+// getBattery godoc
+// @Summary Get last battery level for each node
+// @Description Get the last battery level for each node grouped by room
+// @Tags battery
+// @Produce json
+// @Success 200 {object} map[string]map[string]map[string]any
+// @Failure 500 {object} map[string]string
+// @Security BasicAuth
+// @Router /battery [get]
+func (g *RestGateway) getBattery(c *gin.Context) {
+	allNodes := g.mapping.AllNodes()
+	if len(allNodes) == 0 {
+		c.JSON(http.StatusOK, gin.H{})
+		return
+	}
+
+	nodeFilter := buildNodeFilter(allNodes)
+	query := fmt.Sprintf(`
+		SELECT
+			"node",
+			"battery"
+		FROM "%s"
+			WHERE %s
+			AND time > now() - INTERVAL '30 minutes'
+		ORDER BY time DESC
+		`, g.measurementName, nodeFilter,
+	)
+
+	it, err := g.influxGateway.Query(context.Background(), query)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Collect last battery per node (first occurrence = most recent due to DESC order)
+	nodeBattery := make(map[string]any)
+	for it.Next() {
+		row := it.Value()
+		nodeVal, ok := row["node"]
+		if !ok {
+			continue
+		}
+		nodeID, ok := nodeVal.(string)
+		if !ok {
+			continue
+		}
+		if _, seen := nodeBattery[nodeID]; !seen {
+			nodeBattery[nodeID] = row["battery"]
+		}
+	}
+
+	if err := it.Err(); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Group by room
+	result := make(map[string]map[string]map[string]any)
+	for _, nodeID := range allNodes {
+		room, ok := g.mapping.GetRoom(nodeID)
+		if !ok {
+			room = "not-attributed"
+		}
+		if result[room] == nil {
+			result[room] = make(map[string]map[string]any)
+		}
+		battery, hasData := nodeBattery[nodeID]
+		if !hasData {
+			battery = "offline (30 min)"
+		}
+		result[room][nodeID] = map[string]any{"battery": battery}
+	}
+
+	c.JSON(http.StatusOK, result)
+}
+
+// This function is 100% AI generated with Junie (Claude Sonnet 4.6)
+// GET /api/v1/export/csv
+// getExportCSV godoc
+// @Summary Export sensor data as CSV
+// @Description Export CO2, temperature, humidity, window status and battery data for a node over a time range
+// @Tags export
+// @Produce text/csv
+// @Param node query string true "Node MAC address (e.g. E8:F3:0A:F7:3B:F3)"
+// @Param from query string true "Start time in RFC3339 format (e.g. 2026-05-27T13:00:00Z)"
+// @Param to query string true "End time in RFC3339 format (e.g. 2026-05-27T15:00:00Z)"
+// @Success 200 {string} string "CSV file"
+// @Failure 400 {object} map[string]string
+// @Failure 500 {object} map[string]string
+// @Security BasicAuth
+// @Router /export/csv [get]
+func (g *RestGateway) getExportCSV(c *gin.Context) {
+	node := c.Query("node")
+	from := c.Query("from")
+	to := c.Query("to")
+
+	if node == "" || from == "" || to == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "node, from and to query parameters are required"})
+		return
+	}
+
+	if _, err := time.Parse(time.RFC3339, from); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "from must be a valid RFC3339 timestamp"})
+		return
+	}
+	if _, err := time.Parse(time.RFC3339, to); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "to must be a valid RFC3339 timestamp"})
+		return
+	}
+
+	query := fmt.Sprintf(`
+		SELECT
+			time,
+		    co2_ppm,
+		    temp,
+		    battery,
+		    humidity,
+		    window_open
+		FROM "%s"
+			WHERE time >= '%s'
+			AND time <= '%s'
+			AND "node" = '%s'
+		ORDER BY time ASC
+		`, g.measurementName, from, to, node,
+	)
+
+	it, err := g.influxGateway.Query(context.Background(), query)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.Header("Content-Disposition", fmt.Sprintf(`attachment; filename="export-%s.csv"`, strings.ReplaceAll(node, ":", "_")))
+	c.Header("Content-Type", "text/csv")
+
+	w := csv.NewWriter(c.Writer)
+	_ = w.Write([]string{"time", "co2", "temperature", "humidity", "windows", "battery"})
+
+	for it.Next() {
+		row := it.Value()
+
+		var tsStr string
+		if t, ok := row["time"]; ok {
+			var tt time.Time
+			switch v := t.(type) {
+			case time.Time:
+				tt = v
+			case int64:
+				tt = time.Unix(0, v)
+			}
+			loc := time.FixedZone("UTC+2", 2*60*60)
+			tsStr = tt.In(loc).Format("2006-01-02T15:04:05")
+		}
+
+		co2 := formatField(row["co2_ppm"])
+		temp := formatField(row["temp"])
+		humidity := formatField(row["humidity"])
+		windowOpen := formatField(row["window_open"])
+		battery := formatField(row["battery"])
+
+		_ = w.Write([]string{
+			tsStr,
+			co2,
+			temp,
+			humidity,
+			windowOpen,
+			battery,
+		})
+	}
+
+	if err := it.Err(); err != nil {
+		// Headers already sent; best effort
+		_ = w.Write([]string{"error", err.Error()})
+	}
+
+	w.Flush()
+}
+
+// formatField converts an any value to its string representation for CSV output.
+func formatField(v any) string {
+	if v == nil {
+		return ""
+	}
+	switch val := v.(type) {
+	case float64:
+		return strconv.FormatFloat(val, 'f', -1, 64)
+	case float32:
+		return strconv.FormatFloat(float64(val), 'f', -1, 32)
+	case int64:
+		return strconv.FormatInt(val, 10)
+	case int32:
+		return strconv.FormatInt(int64(val), 10)
+	case bool:
+		if val {
+			return "1"
+		}
+		return "0"
+	default:
+		return fmt.Sprintf("%v", v)
+	}
+}
+
+// formatTime normalizes a time value (possibly a nanosecond int64) into an RFC3339 UTC string.
+func formatTime(v any) any {
+	switch t := v.(type) {
+	case time.Time:
+		return t.UTC().Format(time.RFC3339)
+	case arrow.Timestamp:
+		return time.Unix(0, int64(t)).UTC().Format(time.RFC3339)
+	case int64:
+		return time.Unix(0, t).UTC().Format(time.RFC3339)
+	default:
+		return v
+	}
+}
+
+func (g *RestGateway) Run(addr string) error {
+	return g.engine.Run(addr)
+}
+
+// GET /api/v1/rooms
+// getRooms godoc
+// @Summary Get all unique rooms
+// @Description Get a list of all unique rooms from the measurement
+// @Tags rooms
+// @Produce json
+// @Success 200 {array} string
+// @Failure 500 {object} map[string]string
+// @Security BasicAuth
+// @Router /rooms [get]
+func (g *RestGateway) getRooms(c *gin.Context) {
+	rooms := g.mapping.Rooms()
+	slices.Sort(rooms)
+	c.JSON(http.StatusOK, rooms)
+}
+
+// GET /api/v1/rooms/{room-id}/current
+// getRoomCurrent godoc
+// @Summary Get current data for a room
+// @Description Get the latest record for a specific room
+// @Tags rooms
+// @Produce json
+// @Param room-id path string true "Room ID"
+// @Success 200 {object} map[string]any
+// @Failure 404 {object} map[string]string
+// @Failure 500 {object} map[string]string
+// @Security BasicAuth
+// @Router /rooms/{room-id}/current [get]
+func (g *RestGateway) getRoomCurrent(c *gin.Context) {
+	roomID := c.Param("room-id")
+
+	nodes := g.mapping.NodesForRoom(roomID)
+	if len(nodes) == 0 {
+		c.JSON(http.StatusNotFound, gin.H{"error": "Room not found in mapping"})
+		return
+	}
+	nodeFilter := buildNodeFilter(nodes)
+
+	// Get the last record for the specific room by matching node IDs, aggregated by 5m intervals
+	query := fmt.Sprintf(`
+		SELECT
+		  date_bin(INTERVAL '5 minutes', time)::TIMESTAMP AS time,
+		  ROUND(AVG(co2_ppm)) AS co2_ppm,
+		  ROUND(AVG(temp), 2) AS temp,
+		  ROUND(AVG(humidity), 2) AS humidity,
+		  MAX(window_open) AS window_open
+		FROM "%s"
+		  WHERE time > now() - INTERVAL '1 day'
+		  AND %s
+		GROUP BY date_bin(INTERVAL '5 minutes', time)
+		ORDER BY time DESC
+		LIMIT 1
+		`, g.measurementName, nodeFilter,
+	)
+
+	// Using context.Background() as seen in working snippet
+	it, err := g.influxGateway.Query(context.Background(), query)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	if it.Next() {
+		val := it.Value()
+		val["room"] = roomID
+		val["window"] = val["window_open"]
+		delete(val, "window_open")
+		if t, ok := val["time"]; ok {
+			val["time"] = formatTime(t)
+		}
+		c.JSON(http.StatusOK, val)
+		return
+	}
+
+	if err := it.Err(); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusNotFound, gin.H{"error": "Room not found or no data available"})
+}
+
+// GET /api/v1/rooms/{room-id}/history
+// getRoomHistory godoc
+// @Summary Get history for a room
+// @Description Get history for a specific room
+// @Tags rooms
+// @Produce json
+// @Param room-id path string true "Room ID"
+// @Param window query string false "Time window (e.g., 1 day, 1 hour, 30 min)" default(1 day)
+// @Success 200 {array} map[string]any
+// @Failure 500 {object} map[string]string
+// @Security BasicAuth
+// @Router /rooms/{room-id}/history [get]
+func (g *RestGateway) getRoomHistory(c *gin.Context) {
+	roomID := c.Param("room-id")
+	window := c.DefaultQuery("window", "1 day")
+
+	nodes := g.mapping.NodesForRoom(roomID)
+	if len(nodes) == 0 {
+		c.JSON(http.StatusNotFound, gin.H{"error": "Room not found in mapping"})
+		return
+	}
+	nodeFilter := buildNodeFilter(nodes)
+
+	query := fmt.Sprintf(`
+		WITH binned AS (
+			SELECT
+			  date_bin(INTERVAL '1 minute', time)::TIMESTAMP AS time,
+			  AVG(co2_ppm) AS co2_ppm,
+			  AVG(temp) AS temp,
+			  AVG(humidity) AS humidity,
+			  MAX(window_open) AS window_open
+			FROM "%s"
+			  WHERE time > now() - INTERVAL '%s' - INTERVAL '5 minutes'
+			  AND %s
+			GROUP BY date_bin(INTERVAL '1 minute', time)
+		)
+		SELECT
+		  time,
+		  ROUND(AVG(co2_ppm) OVER (ORDER BY time RANGE BETWEEN INTERVAL '4 minutes' PRECEDING AND CURRENT ROW)) AS co2_ppm,
+		  ROUND(AVG(temp) OVER (ORDER BY time RANGE BETWEEN INTERVAL '4 minutes' PRECEDING AND CURRENT ROW), 2) AS temp,
+		  ROUND(AVG(humidity) OVER (ORDER BY time RANGE BETWEEN INTERVAL '4 minutes' PRECEDING AND CURRENT ROW), 2) AS humidity,
+		  window_open
+		FROM binned
+		WHERE time > now() - INTERVAL '%s'
+		ORDER BY time DESC
+		`, g.measurementName, window, nodeFilter, window,
+	)
+
+	// Using context.Background() as seen in working snippet
+	it, err := g.influxGateway.Query(context.Background(), query)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	var history []map[string]any
+	for it.Next() {
+		val := it.Value()
+		val["room"] = roomID
+		val["window"] = val["window_open"]
+		delete(val, "window_open")
+		if t, ok := val["time"]; ok {
+			val["time"] = formatTime(t)
+		}
+		history = append(history, val)
+	}
+
+	if err := it.Err(); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, history)
+}
+
+func (g *RestGateway) runWatchdog() {
+	// Initial check
+	g.checkCO2()
+
+	ticker := time.NewTicker(1 * time.Minute)
+	defer ticker.Stop()
+	for range ticker.C {
+		g.checkCO2()
+	}
+}
+
+func (g *RestGateway) checkCO2() {
+	rooms := g.mapping.Rooms()
+	for _, roomID := range rooms {
+		nodes := g.mapping.NodesForRoom(roomID)
+		if len(nodes) == 0 {
+			continue
+		}
+		nodeFilter := buildNodeFilter(nodes)
+
+		// Get the last record for the specific room by matching node IDs, aggregated by 5m intervals
+		// Same logic as getRoomCurrent
+		query := fmt.Sprintf(`
+			SELECT
+				date_bin(INTERVAL '5 minutes', time)::TIMESTAMP AS time,
+		  		ROUND(AVG(co2_ppm)) AS co2_ppm
+			FROM "%s"
+		  		WHERE time > now() - INTERVAL '1 day'
+		  		AND %s
+			GROUP BY date_bin(INTERVAL '5 minutes', time)
+			ORDER BY time ASC
+			LIMIT 1
+		`, g.measurementName, nodeFilter,
+		)
+
+		it, err := g.influxGateway.Query(context.Background(), query)
+		if err != nil {
+			log.Printf("[Watchdog] Error querying CO2 for room %s: %v\n", roomID, err)
+			continue
+		}
+
+		if it.Next() {
+			val := it.Value()
+			if co2Val, ok := val["co2_ppm"]; ok {
+				co2 := int(co2Val.(float64))
+
+				g.statusMu.Lock()
+				status, ok := g.roomStatus[roomID]
+				if !ok {
+					status = &RoomCO2Status{RoomID: roomID}
+					g.roomStatus[roomID] = status
+				}
+				status.CO2 = co2
+
+				if co2 > g.co2ThresholdMax {
+					status.IsHigh = true
+				} else if co2 < g.co2ThresholdMin {
+					status.IsHigh = false
+				}
+				g.statusMu.Unlock()
+			}
+		}
+		if err := it.Err(); err != nil {
+			log.Printf("[Watchdog] Error in iterator for room %s: %v\n", roomID, err)
+		}
+	}
+}
+
+// GET /api/v1/rooms/high-co2
+// getHighCO2Rooms godoc
+// @Summary Get rooms with high CO2 levels
+// @Description Get a list of rooms where CO2 levels are above the threshold
+// @Tags rooms
+// @Produce json
+// @Success 200 {array} RoomCO2Status
+// @Security BasicAuth
+// @Router /rooms/high-co2 [get]
+func (g *RestGateway) getHighCO2Rooms(c *gin.Context) {
+	g.statusMu.RLock()
+	defer g.statusMu.RUnlock()
+
+	var result = []RoomCO2Status{}
+	for _, status := range g.roomStatus {
+		if status.IsHigh {
+			result = append(result, *status)
+		}
+	}
+
+	// Sort by room ID for stability
+	slices.SortFunc(result, func(a, b RoomCO2Status) int {
+		return strings.Compare(a.RoomID, b.RoomID)
+	})
+
+	c.JSON(http.StatusOK, result)
+}

db/traefik.yml

@@ -1,4 +1,9 @@
 http:
+  middlewares:
+    pi-db-doc-redirect:
+      redirectRegex:
+        regex: "^https://doc.db.e.kb28.ch/$"
+        replacement: "https://doc.db.e.kb28.ch/swagger/index.html"
   # middlewares:
   #   oidc-auth-pi-db:
   #     plugin:
@@ -10,15 +15,22 @@ http:
   #           ClientId: ""
   #           ClientSecret: ""
   routers:
+    pi-db-ui:
+      rule: "Host(`ui.db.e.kb28.ch`)"
+      entryPoints:
+        - websecure
+      service: pi-db-ui
+      tls:
+        certResolver: letsencrypt
+      # middlewares:
+      #   - oidc-auth-pi-db@file
     pi-db:
-      rule: "Host(`ui.e.kb28.ch`)"
+      rule: "Host(`db.e.kb28.ch`)"
       entryPoints:
         - websecure
       service: pi-db
       tls:
         certResolver: letsencrypt
-      # middlewares:
-      #   - oidc-auth-pi-db@file
     pi-mqtt-management:
       rule: "Host(`mqtt.e.kb28.ch`)"
       entryPoints:
@@ -26,18 +38,55 @@ http:
       service: pi-mqtt-management
       tls:
         certResolver: letsencrypt
+    pi-db-api:
+      rule: "Host(`api.db.e.kb28.ch`)"
+      entryPoints:
+        - websecure
+      service: pi-db-api
+      tls:
+        certResolver: letsencrypt
+    pi-db-doc:
+      rule: "Host(`doc.db.e.kb28.ch`)"
+      entryPoints:
+        - websecure
+      service: pi-db-api
+      tls:
+        certResolver: letsencrypt
+      middlewares:
+        - pi-db-doc-redirect
+    pi-ui:
+      rule: "Host(`ui.e.kb28.ch`)"
+      entryPoints:
+        - websecure
+      service: pi-ui
+      tls:
+        certResolver: letsencrypt
 
   services:
-    pi-db:
+    pi-db-ui:
       loadBalancer:
         servers:
           - url: "http://192.168.42.211:8093"
         passHostHeader: true
+    pi-db:
+      loadBalancer:
+        servers:
+          - url: "h2c://192.168.42.211:8181"
+        passHostHeader: true
     pi-mqtt-management:
       loadBalancer:
         servers:
           - url: "http://192.168.42.211:15672"
         passHostHeader: true
+    pi-db-api:
+      loadBalancer:
+        servers:
+          - url: "http://192.168.42.211:8080"
+        passHostHeader: true
+    pi-ui:
+      loadBalancer:
+        servers:
+          - url: "http://192.168.42.211:80"
 
 tcp:
   routers:

doc_resources/gateway/sequence_data_collection.puml

@@ -32,7 +32,6 @@ else
                 gw -> gw : add UTC timestamp
                 gw -> broker : publish JSON\n{gateway_id}/{mac}/update
                 broker --> gw : on_publish confirmed
-                broker -> db : store measurement
             end
         end
     end

doc_resources/nodes/class_diagram.puml

@@ -15,6 +15,7 @@ class "Window_status" as win{}
 class "Hygrometer" as hygro{}
 class "Thermometer" as thermo{}
 class "CO2_level" as co2{}
+class "Battery_level" as batt{}
 
 sup o-d- ble
 sup o-u- sens
@@ -22,5 +23,6 @@ sens <|-l- win
 sens <|-u- hygro
 sens <|-u- thermo
 sens <|-r- co2
+sens <|-- batt
 
 @enduml

model/Study_CO2_concentration_no_window_opening.py

@@ -0,0 +1,227 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Created on Thu Mar 26 16:19:28 2026
+
+@author: alisonlecointre
+"""
+
+import pandas as pd
+import matplotlib.pyplot as plt
+import numpy as np
+import glob
+import os
+
+# %%=============================
+# File loading
+# ===============================
+
+def load_file(file_name):   
+    sheet= pd.read_excel(file_name, sheet_name=None) #loading file, sheat_name=None : return dictionary containing df for each sheet
+    
+    for sheet_name, df in sheet.items(): #loading all sheets from the file
+        df = df.dropna(axis=1, how="all") #remove empty column "all" : all elements missing
+        df.columns = df.columns.str.strip() #remove leading character
+        sheet[sheet_name]=df
+    return sheet
+
+def load_all_files(folder): #load all .xlsx files from the folder
+    files = glob.glob(f"{folder}/*.xlsx")
+    all_data={} #create dictionnary of all dictionnary of each file
+    
+    for file in files:
+        name = os.path.basename(file)
+        all_data[name] = load_file(file)
+    return all_data
+
+folder = os.getcwd()
+data = load_all_files(folder)
+
+# %%=============================
+# Parameters Provence classrooms 
+# ===============================
+
+df_Provence_rooms = pd.DataFrame({
+    "classrooms": ["A2", "A3","A4","A5","A6","A7"],
+    "volume": [308, 480, 326,274,323,272],
+    "n_student_max": [40, 78, 48,32,58,36]
+})
+
+print (df_Provence_rooms)
+
+# %%=============================
+# Calculation
+# ===============================
+
+# ===============================
+# Air volume per person
+# ===============================
+
+def calculation_air_volum_per_pers (df) :
+    air_volume_per_pers = df["Mean room volume (m3)"]/ df["Mean number of students (-)"]
+    return air_volume_per_pers
+    
+
+calculation = {}   #new dictionnary to store the air volum per person
+
+for file_name, sheet in data.items() : #for each file including sheets from this file and all included in data
+    calculation [file_name] = {}
+    for sheet_name, df in sheet.items() : #df in all sheets
+        calculation[file_name][sheet_name] = calculation_air_volum_per_pers(df)
+        
+# ================================
+# New data frame for simulation model of CO2 concentration increase over time
+# ================================
+
+def model_no_windows_opening (CO2_t0=None, N=None, V=None, df=None) : 
+    CO2_prod_th = 0.0155/60 #m3/min <=> ajusted at 15.5 l/h after crossing data with simaria model [20 l/h CO2 production per person during normal activity (cf. article 16 822.113 Ordonnance 3 du 18 août 1993 relative à la loi sur le travail (OLT 3) (Protection de la santé))
+    t = np.arange(0, 181, 1)    
+    if df is not None :
+        CO2_t0 = df["CO2 rate (ppm)"].iloc[0]
+        N = df["Mean number of students (-)"].iloc[0]
+        V = df["Mean room volume (m3)"].iloc[0]
+    CO2_t_model = CO2_t0 + ((N * CO2_prod_th * t *1e6) / V)
+    return t, CO2_t_model
+
+model = {}
+
+for file_name, sheet in data.items() : #for each file including sheets from this file and all included in data
+    model [file_name] = {}
+    for sheet_name, df in sheet.items() : #df in all sheets
+        t, CO2_t_model = model_no_windows_opening(df=df)
+        model [file_name][sheet_name] = {"t": t, "CO2_t_model": CO2_t_model}
+
+# ================================
+# Find threshold time
+# ================================
+
+threshold = 1400
+
+def find_threshold_time(t, CO2_t_model, threshold):
+    indices = np.where(CO2_t_model >= threshold)[0]
+    if len(indices) == 0:
+        return None  # never reached
+    return t[indices[0]]
+
+threshold_time = {}
+
+for file_name, sheet in model.items():
+    threshold_time[file_name] = {}
+    for sheet_name, values in sheet.items():
+        t = values["t"]
+        CO2_t_model = values["CO2_t_model"]
+        threshold_time[file_name][sheet_name] = find_threshold_time(t, CO2_t_model, threshold)
+
+# ================================
+# Air quality thresholds for graphs
+# ================================
+thresholds = {
+    "Good air quality":(0, 1400,"green"),
+    "Bad air quality": (1400, 2000,"orange"),
+    "Really bad air quality": (2000, np.inf,"red"),
+}
+
+def plot_air_quality_zones (ax, thresholds):
+    xmin, xmax = ax.get_xlim()
+    ymin, ymax = ax.get_ylim()
+    
+    for label, (y_min, y_max, color) in thresholds.items():
+        if y_max != np.inf:
+            ax.axhline(y=y_max, linestyle="--", color=color)
+        y_top = min(y_max, ymax)
+        y_bottom = max(y_min, ymin)
+        y_mid = (y_bottom + y_top) / 2
+        ax.axhspan(y_bottom, y_top, color=color, alpha=0.2)
+        ax.text(
+            (xmin + xmax) / 2,
+            y_mid,
+            label,
+            ha="center",
+            va="center",
+            color="black",
+            bbox=dict(facecolor="white", alpha=0.5)
+        )
+
+# %% =============================
+# Visualisation
+# ================================
+
+# ================================
+# Graph time evolution of CO2 concentration open data
+# ================================
+
+for file_name, sheet in data.items():
+    fig0, ax = plt.subplots(figsize=(11, 7))
+    
+    for sheet_name, df in sheet.items():
+        t = model[file_name][sheet_name]["t"]
+        CO2_t_model = model[file_name][sheet_name]["CO2_t_model"]
+        t_threshold = threshold_time[file_name][sheet_name]   
+        ax.plot(df["time (min)"], df["CO2 rate (ppm)"], label=f"{file_name} - {sheet_name}")
+        ax.plot(t,CO2_t_model, label = f"{file_name} - {sheet_name} simulated", linestyle="--")
+         
+ #       if t_threshold is not None :
+ #           ax.axvline(x = t_threshold, label = "time reaching threshold", linestyle=":", color="red")       
+        ax.legend(
+        loc="upper center",
+        bbox_to_anchor=(0.45, -0.08),
+        ncol=3 if len(ax.get_legend_handles_labels()[1]) > 1 else 1
+        )
+
+        fig0.tight_layout()
+
+    ax.set_ylim(400, 4000)   
+    plot_air_quality_zones(ax, thresholds)
+    ax.grid(True, alpha=0.7)
+    ax.set_xlabel("time (min)")
+    ax.set_ylabel("CO2 concentration (ppm)")
+    ax.set_title("CO2 concentration over time")
+
+
+# %%==========================================================================================
+# User
+# ==========================================================================================
+
+print("\n")
+volume_room = float(input("Total volume (m3): "))
+n_student = float(input("Nomber of students : "))
+initial_CO2_level = float(input("Initial CO2 level (ppm): "))
+while initial_CO2_level < 400:
+    print("The value must be >= 400 ppm, which correspond to the normal CO2 concentration in air. Try again.")
+    initial_CO2_level = float(input("Initial CO2 level (ppm): "))
+
+    
+#Create CO2 concentration evolution over time using simulation model and give time reaching threshold
+
+t_user, CO2_t_model_user = model_no_windows_opening(CO2_t0=initial_CO2_level, N=n_student, V=volume_room, df=None)
+t_threshold = find_threshold_time(t_user, CO2_t_model_user, threshold)
+
+print(f"Time reaching threshold of {threshold} ppm =", round(t_threshold),"minutes")
+
+#Display CO2 concentration evolution over time
+reponse = input("Display CO2 evolution over time? (yes/no) : ").strip().lower()
+if reponse == "yes":
+    
+    fig10, ax = plt.subplots(figsize=(10, 6))
+    ax.plot(t_user, CO2_t_model_user , label="CO2 concentration over time (simulated)")
+
+    if t_threshold is not None :
+        ax.axvline(x = t_threshold, label = "time reaching threshold", linestyle=":", color="red")       
+        ax.legend(
+        loc="upper center",
+        bbox_to_anchor=(0.45, -0.07),
+        ncol=3 if len(ax.get_legend_handles_labels()[1]) > 1 else 1
+        )
+        fig10.tight_layout()
+       
+    plot_air_quality_zones(ax, thresholds)
+    
+    ax.set_title("Time evolution of CO2 concentration - Simulated")
+    ax.set_xlabel("Time (min)")
+    ax.set_ylabel("CO2 concentration (ppm)")
+    ax.set_ylim(500, 5000)  
+    ax.grid(True)
+
+else:
+    print("Answer only with yes or no")
+

model/Study_CO2_concentration_window_opening.py

@@ -0,0 +1,292 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Created on Thu Mar 26 16:19:28 2026
+
+@author: alisonlecointre
+"""
+
+import pandas as pd
+import matplotlib.pyplot as plt
+import matplotlib.pyplot as ticker
+import numpy as np
+import glob
+import os
+
+# %%=============================
+# File loading
+# ===============================
+
+def load_file(file_name):   
+    sheet= pd.read_excel(file_name, sheet_name=None) #loading file, sheat_name=None : return dictionary containing df for each sheet
+    
+    for sheet_name, df in sheet.items(): #loading all sheets from the file
+        df = df.dropna(axis=1, how="all") #remove empty column "all" : all elements missing
+        df.columns = df.columns.str.strip() #remove leading character
+        sheet[sheet_name]=df
+    return sheet
+
+def load_all_files(folder): #load all .xlsx files from the folder
+    files = glob.glob(f"{folder}/*.xlsx")
+    all_data={} #create dictionnary of all dictionnary of each file
+    
+    for file in files:
+        name = os.path.basename(file)
+        all_data[name] = load_file(file)
+    return all_data
+
+folder = os.getcwd()
+data = load_all_files(folder)
+
+# %%=============================
+# Parameters Provence classrooms 
+# ===============================
+
+df_Provence_rooms = pd.DataFrame({
+    "classrooms": ["A2","A3","A4","A5","A6","A7"],
+    "volume": [308, 480, 326,274,323,272],
+    "n_student_max": [40, 78, 48,32,58,36],
+    "windows_surface": [3.23, 22.12, 3.23, 22.12, 3.23, 5.53] 
+})
+
+print (df_Provence_rooms)
+
+# %%=============================
+# Calculation
+# ===============================
+
+# ===============================
+# Air volume per person
+# ===============================
+
+def calculation_air_volum_per_pers (df) :
+    air_volume_per_pers = df["Mean room volume (m3)"]/ df["Mean number of students (-)"]
+    return air_volume_per_pers
+    
+
+calculation = {}   #new dictionnary to store the air volum per person
+
+for file_name, sheet in data.items() : #for each file including sheets from this file and all included in data
+    calculation [file_name] = {}
+    for sheet_name, df in sheet.items() : #df in all sheets
+        calculation[file_name][sheet_name] = calculation_air_volum_per_pers(df)
+        
+# ================================
+# New data frame for simulation model of CO2 concentration increase over time
+# ================================
+CO2_prod_th = 0.0155/60 #m3/min <=> ajusted at 15.5 l/h after crossing data with simaria model [20 l/h CO2 production per person during normal activity (cf. article 16 822.113 Ordonnance 3 du 18 août 1993 relative à la loi sur le travail (OLT 3) (Protection de la santé))
+
+def model_no_windows_opening (CO2_t0=None, N=None, V=None, df=None) : 
+    t = np.arange(0, 181, 1)    
+    if df is not None :
+        CO2_t0 = df["CO2 rate (ppm)"].iloc[0]
+        N = df["Mean number of students (-)"].iloc[0]
+        V = df["Mean room volume (m3)"].iloc[0]
+    CO2_t_model = CO2_t0 + ((N * CO2_prod_th * t *1e6) / V)
+    return t, CO2_t_model
+
+model = {}
+
+for file_name, sheet in data.items() : #for each file including sheets from this file and all included in data
+    model [file_name] = {}
+    for sheet_name, df in sheet.items() : #df in all sheets
+        t, CO2_t_model = model_no_windows_opening(df=df)
+        model [file_name][sheet_name] = {"t": t, "CO2_t_model": CO2_t_model}
+
+# ================================
+# Find threshold time
+# ================================
+
+threshold = 1400
+
+def find_threshold_time(t, CO2_t_model, threshold):
+    indices = np.where(CO2_t_model >= threshold)[0]
+    if len(indices) == 0:
+        return None  # never reached
+    return t[indices[0]]
+
+threshold_time = {}
+
+for file_name, sheet in model.items():
+    threshold_time[file_name] = {}
+    for sheet_name, values in sheet.items():
+        t = values["t"]
+        CO2_t_model = values["CO2_t_model"]
+        threshold_time[file_name][sheet_name] = find_threshold_time(t, CO2_t_model, threshold)
+        
+# ================================
+# New data frame for simulation model of CO2 concentration decrease over time (using SIA 382/1 norm)
+# ================================
+v_air = 0.5 #m/s Assumption (cf. article)
+
+def model_windows_opening_CO2 (S_windows=None, volume=None, df=None): 
+    t = np.arange(0, 1, 0.01)  
+    if df is not None:    
+        for i, row in df.iterrows():
+            S_windows = df_Provence_rooms["windows_surface"].iloc[i]
+            volume = df_Provence_rooms["volume"].iloc[i]
+    q_air_change = S_windows * v_air * 3600  #m3/h
+    CO2_ext = 400 #ppm
+    CO2_int_0 = threshold #ppm
+    CO2_t_model_ventilation = ((CO2_int_0 - CO2_ext - ((0.001 * (CO2_prod_th * 1000*60))/q_air_change))* np.exp((-q_air_change * t)/volume) + CO2_ext + ((0.001 * (CO2_prod_th * 1000*60))/q_air_change) ) #ppm    CO2_t_model_ventilation = ((CO2_int_0 - CO2_ext - ((0.001 * (CO2_prod_thx))/q_air_change))* np.exp((-q_air_change * t)/volume) + CO2_ext + ((0.001 * (CO2_prod_thx))/q_air_change) ) #ppm
+    t = t*60
+    return t, CO2_t_model_ventilation
+    
+model_with_windows = {}
+for i, row in df.iterrows():
+    t, CO2_t_model_ventilation = model_windows_opening_CO2(df=row.to_frame().T)
+    model_with_windows[i] = pd.DataFrame({"CO2_t_model_ventilation" : CO2_t_model_ventilation, "t" : t})
+
+# ================================
+# Find window opening duration
+# ================================
+
+def find_windows_opening_time (t,CO2_t_model_ventilation):
+    windows_opening_duration = np.interp(405, CO2_t_model_ventilation[::-1] , t[::-1])
+    return windows_opening_duration
+
+
+# ================================
+# Air quality thresholds for graphs
+# ================================
+thresholds = {
+    "Good air quality":(0, 1400,"green"),
+    "Bad air quality": (1400, 2000,"orange"),
+    "Really bad air quality": (2000, np.inf,"red"),
+}
+
+def plot_air_quality_zones (ax, thresholds):
+    xmin, xmax = ax.get_xlim()
+    ymin, ymax = ax.get_ylim()
+    
+    for label, (y_min, y_max, color) in thresholds.items():
+        if y_max != np.inf:
+            ax.axhline(y=y_max, linestyle="--", color=color)
+        y_top = min(y_max, ymax)
+        y_bottom = max(y_min, ymin)
+        y_mid = (y_bottom + y_top) / 2
+        ax.axhspan(y_bottom, y_top, color=color, alpha=0.2)
+        ax.text(
+            (xmin + xmax) / 2,
+            y_mid,
+            label,
+            ha="center",
+            va="center",
+            color="black",
+            bbox=dict(facecolor="white", alpha=0.5)
+        )
+
+# %% =============================
+# Visualisation
+# ================================
+
+# ================================
+# Graph time evolution of CO2 concentration open data
+# ================================
+
+for file_name, sheet in data.items():
+    fig0, ax = plt.subplots(figsize=(10, 7))
+    
+    for sheet_name, df in sheet.items():
+        t = model[file_name][sheet_name]["t"]
+        CO2_t_model = model[file_name][sheet_name]["CO2_t_model"]
+        t_threshold = threshold_time[file_name][sheet_name]   
+        ax.plot(df["time (min)"], df["CO2 rate (ppm)"], label=f"{file_name} - {sheet_name}")
+        ax.plot(t,CO2_t_model, label = f"{file_name} - {sheet_name} simulated", linestyle="--")
+         
+        if t_threshold is not None :
+            ax.axvline(x = t_threshold, label = "time reaching threshold", linestyle=":", color="red")       
+        ax.legend(
+        loc="upper center",
+        bbox_to_anchor=(0.45, -0.08),
+        ncol=3 if len(ax.get_legend_handles_labels()[1]) > 1 else 1
+        )
+
+        fig0.tight_layout()
+
+    ax.set_ylim(0, 5000)   
+    plot_air_quality_zones (ax, thresholds)
+    ax.grid(True, alpha=0.7)
+    ax.set_xlabel("time (min)")
+    ax.set_ylabel("CO2 concentration (ppm)")
+    ax.set_title("CO2 concentration over time")
+
+# ================================
+# Graph time evolution of CO2 concentration after window opening
+# ================================
+
+fig1, ax= plt.subplots(figsize=(10, 6))
+for i in model_with_windows:
+    t = model_with_windows [i]["t"]
+    CO2_t_model_ventilation = model_with_windows[i]["CO2_t_model_ventilation"]
+    ax.plot(t, CO2_t_model_ventilation, label=df_Provence_rooms.loc[i, "classrooms"])
+    ax.legend()
+ax.xaxis.set_major_locator(ticker.MultipleLocator(2))
+ax.set_xlim(0, 20)   
+ax.grid(True, alpha=0.7)
+ax.set_xlabel("time (min)")
+ax.set_ylabel("CO2 concentration (ppm)")
+ax.set_title("CO2 concentration over time after window opening - with open data")
+
+# %%==========================================================================================
+# User
+# ==========================================================================================
+
+print("\n")
+name_classroom = input("Classroom number (A2 to A7) : ")
+volume_room = df_Provence_rooms.loc[df_Provence_rooms["classrooms"] == name_classroom, "volume"].values
+S_windows_room = df_Provence_rooms.loc[df_Provence_rooms["classrooms"] == name_classroom, "windows_surface"].values
+
+n_student = float(input("Number of students : "))
+
+initial_CO2_level = float(input("Initial CO2 level (ppm): "))
+
+while initial_CO2_level < 400:
+    print("The value must be >= 400 ppm, which correspond to the normal CO2 concentration in air. Try again.")
+    initial_CO2_level = float(input("Initial CO2 level (ppm): "))
+
+    
+#Create CO2 concentration evolution over time using simulation model and give time reaching threshold
+
+t_user, CO2_t_model_user = model_no_windows_opening(CO2_t0=initial_CO2_level, N=n_student, V=volume_room, df=None)
+t_threshold = find_threshold_time(t_user, CO2_t_model_user, threshold)
+
+t_user2, CO2_t_model_ventilation_user =  model_windows_opening_CO2(S_windows =S_windows_room, volume = volume_room, df=None)
+t_user3 = t_user2 + t_threshold #start at the time reaching threshold
+
+windows_opening_duration = find_windows_opening_time (t_user2, CO2_t_model_ventilation_user)
+
+print(f"Time reaching threshold of {threshold} ppm =", round(t_threshold),"minutes")
+print(f"Open windows for {windows_opening_duration:.0f} min after reaching threshold")
+
+#Display CO2 concentration evolution over time
+reponse = input("Display CO2 evolution over time? (yes/no) : ").strip().lower()
+while reponse not in ["yes", "no"]:
+    print("Answer with yes or no")
+    reponse = input("Display CO2 evolution over time? (yes/no) : ").strip().lower()
+
+if reponse == "yes":
+    
+    fig10, ax = plt.subplots(figsize=(10, 6))
+    ax.plot(t_user, CO2_t_model_user , label="CO2 concentration over time (simulated)")
+    ax.plot(t_user3, CO2_t_model_ventilation_user, label="with opened windows", color="brown")
+
+    if t_threshold is not None :
+        ax.axvline(x = t_threshold, label = "time reaching threshold", linestyle=":", color="red")       
+        ax.legend(
+        loc="upper center",
+        bbox_to_anchor=(0.45, -0.07),
+        ncol=3 if len(ax.get_legend_handles_labels()[1]) > 1 else 1
+        )
+        fig10.tight_layout()
+       
+    plot_air_quality_zones(ax, thresholds)
+    
+    ax.set_title("Time evolution of CO2 concentration - Simulated")
+    ax.set_xlabel("Time (min)")
+    ax.set_ylabel("CO2 concentration (ppm)")
+    ax.set_xlim(0, 150)  
+    ax.set_ylim(400, 5000)  
+    ax.grid(True)
+
+

model/requirements.txt

@@ -0,0 +1,4 @@
+pandas
+matplotlib
+numpy
+openpyxl

nodes/CMakeLists.txt

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(plein_de_eeeeeeeeeeee)
+
+target_sources(app PRIVATE src/main.c src/window_status.c src/window_status.h src/thermometer.c src/thermometer.h src/hygrometer.c src/hygrometer.h src/co2_level.c src/co2_level.h src/supervisor.c src/supervisor.h src/ble_advertiser.c src/ble_advertiser.h src/battery_percent.h src/battery_percent.c)
+target_sources(app PRIVATE src/modules/battery.h src/modules/battery.c)

nodes/README.rst

@@ -0,0 +1,97 @@
+.. zephyr:code-sample:: blinky
+   :name: Blinky
+   :relevant-api: gpio_interface
+
+   Blink an LED forever using the GPIO API.
+
+Overview
+********
+
+The Blinky sample blinks an LED forever using the :ref:`GPIO API <gpio_api>`.
+
+The source code shows how to:
+
+#. Get a pin specification from the :ref:`devicetree <dt-guide>` as a
+   :c:struct:`gpio_dt_spec`
+#. Configure the GPIO pin as an output
+#. Toggle the pin forever
+
+See :zephyr:code-sample:`pwm-blinky` for a similar sample that uses the PWM API instead.
+
+.. _blinky-sample-requirements:
+
+Requirements
+************
+
+Your board must:
+
+#. Have an LED connected via a GPIO pin (these are called "User LEDs" on many of
+   Zephyr's :ref:`boards`).
+#. Have the LED configured using the ``led0`` devicetree alias.
+
+Building and Running
+********************
+
+Build and flash Blinky as follows, changing ``reel_board`` for your board:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/basic/blinky
+   :board: reel_board
+   :goals: build flash
+   :compact:
+
+After flashing, the LED starts to blink and messages with the current LED state
+are printed on the console. If a runtime error occurs, the sample exits without
+printing to the console.
+
+Build errors
+************
+
+You will see a build error at the source code line defining the ``struct
+gpio_dt_spec led`` variable if you try to build Blinky for an unsupported
+board.
+
+On GCC-based toolchains, the error looks like this:
+
+.. code-block:: none
+
+   error: '__device_dts_ord_DT_N_ALIAS_led_P_gpios_IDX_0_PH_ORD' undeclared here (not in a function)
+
+Adding board support
+********************
+
+To add support for your board, add something like this to your devicetree:
+
+.. code-block:: DTS
+
+   / {
+   	aliases {
+   		led0 = &myled0;
+   	};
+
+   	leds {
+   		compatible = "gpio-leds";
+   		myled0: led_0 {
+   			gpios = <&gpio0 13 GPIO_ACTIVE_LOW>;
+                };
+   	};
+   };
+
+The above sets your board's ``led0`` alias to use pin 13 on GPIO controller
+``gpio0``. The pin flags :c:macro:`GPIO_ACTIVE_LOW` mean the LED is on when
+the pin is set to its low state, and off when the pin is in its high state.
+
+Tips:
+
+- See :dtcompatible:`gpio-leds` for more information on defining GPIO-based LEDs
+  in devicetree.
+
+- If you're not sure what to do, check the devicetrees for supported boards which
+  use the same SoC as your target. See :ref:`get-devicetree-outputs` for details.
+
+- See :zephyr_file:`include/zephyr/dt-bindings/gpio/gpio.h` for the flags you can use
+  in devicetree.
+
+- If the LED is built in to your board hardware, the alias should be defined in
+  your :ref:`BOARD.dts file <devicetree-in-out-files>`. Otherwise, you can
+  define one in a :ref:`devicetree overlay <set-devicetree-overlays>`.

nodes/app.overlay

@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: Apache-2.0 */
+
+/ {
+    buttons{
+        compatible = "gpio-keys";
+        window_switch: window_switch {
+            gpios = <&sx1509b 0 GPIO_ACTIVE_LOW>;
+            label = "Window Switch";
+        };
+    };
+};

nodes/prj.conf

@@ -0,0 +1,16 @@
+CONFIG_ADC=y
+CONFIG_I2C=y
+CONFIG_SENSOR=y
+CONFIG_BT=y
+CONFIG_GPIO=y
+
+CONFIG_LOG=n
+CONFIG_CONSOLE=n
+CONFIG_SERIAL=n
+CONFIG_PRINTK=n
+CONFIG_UART_CONSOLE=n
+
+CONFIG_PM=y
+CONFIG_PM_DEVICE=y
+CONFIG_PM_DEVICE_RUNTIME=y
+CONFIG_CCS811_DRIVE_MODE_3=y

nodes/sample.yaml

@@ -0,0 +1,12 @@
+sample:
+  name: Blinky Sample
+tests:
+  sample.basic.blinky:
+    tags:
+      - LED
+      - gpio
+    filter: dt_enabled_alias_with_parent_compat("led0", "gpio-leds")
+    depends_on: gpio
+    harness: led
+    integration_platforms:
+      - frdm_k64f

nodes/src/battery_percent.c

@@ -0,0 +1,42 @@
+#include "battery_percent.h"
+
+/** 
+*   Taken from sample/board/nordic/battery/src/main.c
+*   A discharge curve specific to the power source. 
+*/
+static const struct battery_level_point levels[] = {
+    /* "Curve" here eyeballed from captured data for the [Adafruit
+     * 3.7v 2000 mAh](https://www.adafruit.com/product/2011) LIPO
+     * under full load that started with a charge of 3.96 V and
+     * dropped about linearly to 3.58 V over 15 hours.  It then
+     * dropped rapidly to 3.10 V over one hour, at which point it
+     * stopped transmitting.
+     *
+     * Based on eyeball comparisons we'll say that 15/16 of life
+     * goes between 3.95 and 3.55 V, and 1/16 goes between 3.55 V
+     * and 3.1 V.
+     */
+
+    { 10000, 3950 },
+    { 625, 3550 },
+    { 0, 3100 },
+};
+
+enum error_code battery_init(){
+    enum error_code ret = init_failed;
+    if(0 == battery_measure_enable(true)){
+        ret = success;
+    }else{}
+    return ret;
+}
+
+enum error_code battery_get_value(int* holder){
+    enum error_code ret = read_failed;
+    // battery_voltage in [mV]
+    int battery_voltage = battery_sample();
+    if(battery_voltage >= 0){
+        *holder = (battery_level_pptt(battery_voltage, levels)/100);
+        ret = success;
+    }else{}
+    return ret;
+}

nodes/src/battery_percent.h

@@ -0,0 +1,27 @@
+#ifndef BATTERY_PERCENT_H
+#define BATTERY_PERCENT_H
+
+#include <zephyr/kernel.h>
+
+#include "modules/battery.h"
+
+#include "error_code.h"
+
+/**
+*   @brief  init the battery module
+*   @return init_failed upon any error during init
+*   @return success     otherwise
+*/
+enum error_code battery_init();
+
+/**
+*   @brief      Retrieve the battery charge percentage and stores it in the given parameter
+*   @param[out] holder : pointer where the measurement will be stored
+*   @return     read_failed upon any error occuring during measurement
+*   @return     success     otherwise
+*   @note       the content of holder should not be trusted upon returning something else than success
+*/
+enum error_code battery_get_value(int* holder);
+
+#endif //BATTERY_PERCENT_H
+

nodes/src/ble_advertiser.c

@@ -0,0 +1,79 @@
+#include "ble_advertiser.h"
+
+static const int BT_MS_ADV_UP = 500;   // [ms] time during which the advertising is active
+
+// keys as defined in the specs
+static const char BT_KEY_SIZE = 1;  // [B]
+static const char BT_KEY_WINDOW = 0x01;
+static const char BT_KEY_HUMIDITY = 0x02;
+static const char BT_KEY_TEMP = 0x03;
+static const char BT_KEY_CO2_LVL = 0x04;
+static const char BT_KEY_BATT = 0x05;
+
+// value size [B]
+static const char BT_PREAMBLE_SIZE = 2;
+static const char BT_VALUE_SIZE_WINDOW = 1;
+static const char BT_VALUE_SIZE_HUMIDITY = 1;
+static const char BT_VALUE_SIZE_TEMP = 2;
+static const char BT_VALUE_SIZE_CO2_LVL = 4;
+static const char BT_VALUE_SIZE_BATT = 1;
+
+// value start index in the frame - equal to {prior field index + prior value size + key size}
+static const int BT_AD_DATA_INDEX_WINDOW = BT_PREAMBLE_SIZE + BT_KEY_SIZE;
+static const int BT_AD_DATA_INDEX_HUMIDITY = BT_AD_DATA_INDEX_WINDOW + BT_VALUE_SIZE_WINDOW + BT_KEY_SIZE;
+static const int BT_AD_DATA_INDEX_TEMP = BT_AD_DATA_INDEX_HUMIDITY + BT_VALUE_SIZE_HUMIDITY + BT_KEY_SIZE;
+static const int BT_AD_DATA_INDEX_CO2_LVL = BT_AD_DATA_INDEX_TEMP + BT_VALUE_SIZE_TEMP + BT_KEY_SIZE;
+static const int BT_AD_DATA_INDEX_BATT = BT_AD_DATA_INDEX_CO2_LVL + BT_VALUE_SIZE_CO2_LVL + BT_KEY_SIZE;
+
+// sum of all value size + size for all keys + size preamble
+static const char BT_AD_TOTAL_SIZE = 
+    BT_PREAMBLE_SIZE + (5 * BT_KEY_SIZE) + 
+    BT_VALUE_SIZE_WINDOW + BT_VALUE_SIZE_HUMIDITY + BT_VALUE_SIZE_TEMP + BT_VALUE_SIZE_CO2_LVL + BT_VALUE_SIZE_BATT;
+
+// data field in the broadcasted frame
+// all values are set to 0 and the "company id" field is set to 0xffff
+static uint8_t ad_data[] = {
+    0xff, 0xff, 
+    BT_KEY_WINDOW, 0x00, 
+    BT_KEY_HUMIDITY, 0x00, 
+    BT_KEY_TEMP, 0x00, 0x00, 
+    BT_KEY_CO2_LVL, 0x00, 0x00, 0x00, 0x00,
+    BT_KEY_BATT, 0x00
+};
+// frame that will be broadcasted
+static const struct bt_data ad[] = {
+    BT_DATA(BT_DATA_MANUFACTURER_DATA, ad_data, BT_AD_TOTAL_SIZE),
+};
+
+enum error_code ble_init(){
+    return ((0 == bt_enable(NULL)) ? success : init_failed);
+}
+
+enum error_code ble_advertise(
+    enum window_status window_value,
+    int hygro_value,
+    int thermo_value,
+    int co2_lvl_value,
+    int batt_value
+){
+    enum error_code ret = write_failed;
+    int shift = 0;
+    ad_data[BT_AD_DATA_INDEX_WINDOW] = (uint8_t)(window_value == open ? 0x1 : 0x0);
+    ad_data[BT_AD_DATA_INDEX_HUMIDITY] = (uint8_t)(hygro_value & 0xff);
+    ad_data[BT_AD_DATA_INDEX_BATT] = (uint8_t)(batt_value & 0xff);
+    for(int i=0;i<BT_VALUE_SIZE_TEMP;i++){
+        shift = 8 * (BT_VALUE_SIZE_TEMP - i - 1);
+        ad_data[BT_AD_DATA_INDEX_TEMP + i] = (uint8_t)((thermo_value>>(shift)) & 0xff);
+    }
+    for(int i=0;i<BT_VALUE_SIZE_CO2_LVL;i++){
+        shift = 8 * (BT_VALUE_SIZE_CO2_LVL - i - 1);
+        ad_data[BT_AD_DATA_INDEX_CO2_LVL + i] = (uint8_t)((co2_lvl_value>>(shift)) & 0xff);
+    }
+    if(0 == bt_le_adv_start(BT_LE_ADV_NCONN_IDENTITY, ad, ARRAY_SIZE(ad), NULL, 0)){
+        k_msleep(BT_MS_ADV_UP);
+        if(0 == bt_le_adv_stop()){
+            ret = success;
+        }else{}
+    }else{}
+    return ret;
+}

nodes/src/ble_advertiser.h

@@ -0,0 +1,37 @@
+#ifndef BLE_ADVERTISER_H
+#define BLE_ADVERTISER_H
+
+#include <zephyr/kernel.h>
+#include <zephyr/bluetooth/assigned_numbers.h>
+#include <zephyr/bluetooth/bluetooth.h>
+
+#include "error_code.h"
+#include "window_status.h"
+
+/**
+*   @brief  Initialise the ble module
+*   @return init_failed upon any error occuring during init
+*   @return success otherwise
+*/
+enum error_code ble_init();
+
+/**
+*   @brief  Sets the given values as data and broadcast the BLE frame
+*   @param  window_value :          window opening status in {open/closed}
+*   @param  hygro_value :           humidity percentage [%]
+*   @param  thermo_value :          temperature in [d°C]
+*   @param  co2_lvl_value :         co2 level in [ppm]
+*   @param  battery_percent_value : battery current level of charge [%]
+*   @return write_failed    if any problem occur during the BLE broadcast
+*   @return success         otherwise
+*   @note   The broadcast is stopped at the return time
+*/
+enum error_code ble_advertise(
+    enum window_status window_value,
+    int hygro_value,
+    int thermo_value,
+    int co2_lvl_value,
+    int batt_value
+);
+
+#endif //BLE_ADVERTISER_H

nodes/src/co2_level.c

@@ -0,0 +1,37 @@
+#include "co2_level.h"
+
+static const struct device* dev = DEVICE_DT_GET_ONE(ams_ccs811);
+
+const int CO2_LEVEL_EMPTY_ROOM = 400;   // [ppm]
+
+enum error_code co2_lvl_init(){
+    enum error_code ret = init_failed;
+    if(device_is_ready(dev)){
+        ret = success;
+    }else{}
+    return ret;
+}
+
+enum error_code co2_lvl_get_value(int* holder){
+    struct sensor_value temp, humidity, co2;
+    enum error_code ret = read_failed;
+    int temp_value, humidity_value;
+    if( (success == thermo_get_value(&temp_value)) && (success == hygro_get_value(&humidity_value)) ){
+        // temperature conversion from deci, no function in the API
+        temp.val1 = temp_value/10;
+        temp.val2 = temp_value%10;
+        // humidity conversion is straight away
+        humidity.val1 = humidity_value;
+        if( 
+            // co2 measurement requires temperature and humidity
+            (0 == ccs811_envdata_update(dev, &temp, &humidity)) &&
+            // fetch is required to update sensor read data
+            (0 == sensor_sample_fetch(dev)) && 
+            (0 == sensor_channel_get(dev, SENSOR_CHAN_CO2, &co2))
+        ){
+            *holder = co2.val1; // taking only the integer part
+            ret = success;
+        }else{}
+    }else{}
+    return success;
+}

nodes/src/co2_level.h

@@ -0,0 +1,30 @@
+#ifndef CO2_LEVEL_H
+#define CO2_LEVEL_H
+
+#include <zephyr/drivers/sensor.h>
+#include <zephyr/drivers/sensor/ccs811.h>
+
+#include "error_code.h"
+#include "hygrometer.h"
+#include "thermometer.h"
+
+extern const int CO2_LEVEL_EMPTY_ROOM;  // [ppm]
+
+/**
+*   @brief  init the co2 level measurement module
+*   @return init_failed upon any error during init
+*   @return success     otherwise
+*/
+enum error_code co2_lvl_init();
+
+/**
+*   @brief      Retrieve the CO2 level measurement and stores it in the given parameter
+*   @param[out] holder : pointer where the measurement will be stored
+*   @return     read_failed upon any error occuring during measurement
+*   @return     success     otherwise
+*   @note       the content of holder should not be trusted upon returning something else than success
+*   @note       the value is not read for the first few measurements after a reboot
+*/
+enum error_code co2_lvl_get_value(int* holder);
+
+#endif //CO2_LEVEL_H

nodes/src/error_code.h

@@ -0,0 +1,16 @@
+#ifndef ERROR_CODE_H
+#define ERROR_CODE_H
+
+#include <limits.h>
+
+// enum of all error code that may occur during the plein_de_eeeeeeeeeeeeeee application runtime
+enum error_code{
+    success = 0,        // any kind of success
+    init_failed,        // error related to initialization
+    read_failed,        // error related to reading action
+    write_failed,       // error related to writing action
+    error_unknown,      // any error not linked to other code
+    error_code_last,    // iteration purpose
+};
+
+#endif //ERROR_CODE_H

nodes/src/hygrometer.c

@@ -0,0 +1,25 @@
+#include "hygrometer.h"
+
+static const struct device* dev = DEVICE_DT_GET_ONE(st_hts221);
+
+enum error_code hygro_init(){
+    enum error_code ret = init_failed;
+    if(device_is_ready(dev)){
+        ret = success;
+    }else{}
+    return ret;
+}
+
+enum error_code hygro_get_value(int* holder){
+    enum error_code ret = read_failed;
+    struct sensor_value humidity;
+    if( 
+        // fetch is required to update sensor read data
+        (sensor_sample_fetch(dev) >= 0) &&
+        (sensor_channel_get(dev, SENSOR_CHAN_HUMIDITY, &humidity) >= 0) 
+    ){
+        *holder = humidity.val1;    //taking only the integer part
+        ret = success;
+    }else{}
+    return ret;
+}

nodes/src/hygrometer.h

@@ -0,0 +1,26 @@
+#ifndef HYGROMETER_H
+#define HYGROMETER_H
+
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+#include <zephyr/drivers/sensor.h>
+
+#include "error_code.h"
+
+/**
+*   @brief  init the hygrometer module
+*   @return init_failed upon any error during init
+*   @return success     otherwise
+*/
+enum error_code hygro_init();
+
+/**
+*   @brief      Retrieve the humidity level and stores it in the given parameter
+*   @param[out] holder : pointer where the measurement will be stored
+*   @return     read_failed upon any error occuring during measurement
+*   @return     success     otherwise
+*   @note       the content of holder should not be trusted upon returning something else than success
+*/
+enum error_code hygro_get_value(int* holder);
+
+#endif //HYGROMETER_H

nodes/src/main.c

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2016 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdio.h>
+#include <zephyr/kernel.h>
+#include <zephyr/drivers/gpio.h>
+
+#include "supervisor.h"
+
+// size of a stack used by the supervisor thread
+#define STACKSIZE 1024
+// scheduling priority used by the supervisor thread
+#define PRIORITY 7
+
+K_THREAD_DEFINE(supervisor_id, STACKSIZE, thread_supervisor, NULL, NULL, NULL, PRIORITY, 0, 0);

nodes/src/modules/battery.c

@@ -0,0 +1,231 @@
+/*
+ * Copyright (c) 2018-2019 Peter Bigot Consulting, LLC
+ * Copyright (c) 2019-2020 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <zephyr/kernel.h>
+#include <zephyr/init.h>
+#include <zephyr/drivers/gpio.h>
+#include <zephyr/drivers/adc.h>
+#include <zephyr/drivers/sensor.h>
+#include <zephyr/logging/log.h>
+
+#include "battery.h"
+
+LOG_MODULE_REGISTER(BATTERY, CONFIG_ADC_LOG_LEVEL);
+
+#define VBATT DT_PATH(vbatt)
+#define ZEPHYR_USER DT_PATH(zephyr_user)
+
+#ifdef CONFIG_BOARD_THINGY52_NRF52832
+/* This board uses a divider that reduces max voltage to
+ * reference voltage (600 mV).
+ */
+#define BATTERY_ADC_GAIN ADC_GAIN_1
+#else
+/* Other boards may use dividers that only reduce battery voltage to
+ * the maximum supported by the hardware (3.6 V)
+ */
+#define BATTERY_ADC_GAIN ADC_GAIN_1_6
+#endif
+
+struct io_channel_config {
+	uint8_t channel;
+};
+
+struct divider_config {
+	struct io_channel_config io_channel;
+	struct gpio_dt_spec power_gpios;
+	/* output_ohm is used as a flag value: if it is nonzero then
+	 * the battery is measured through a voltage divider;
+	 * otherwise it is assumed to be directly connected to Vdd.
+	 */
+	uint32_t output_ohm;
+	uint32_t full_ohm;
+};
+
+static const struct divider_config divider_config = {
+#if DT_NODE_HAS_STATUS_OKAY(VBATT)
+	.io_channel = {
+		DT_IO_CHANNELS_INPUT(VBATT),
+	},
+	.power_gpios = GPIO_DT_SPEC_GET_OR(VBATT, power_gpios, {}),
+	.output_ohm = DT_PROP(VBATT, output_ohms),
+	.full_ohm = DT_PROP(VBATT, full_ohms),
+#else /* /vbatt exists */
+	.io_channel = {
+		DT_IO_CHANNELS_INPUT(ZEPHYR_USER),
+	},
+#endif /* /vbatt exists */
+};
+
+struct divider_data {
+	const struct device *adc;
+	struct adc_channel_cfg adc_cfg;
+	struct adc_sequence adc_seq;
+	int16_t raw;
+};
+static struct divider_data divider_data = {
+#if DT_NODE_HAS_STATUS_OKAY(VBATT)
+	.adc = DEVICE_DT_GET(DT_IO_CHANNELS_CTLR(VBATT)),
+#else
+	.adc = DEVICE_DT_GET(DT_IO_CHANNELS_CTLR(ZEPHYR_USER)),
+#endif
+};
+
+static int divider_setup(void)
+{
+	const struct divider_config *cfg = &divider_config;
+	const struct io_channel_config *iocp = &cfg->io_channel;
+	const struct gpio_dt_spec *gcp = &cfg->power_gpios;
+	struct divider_data *ddp = &divider_data;
+	struct adc_sequence *asp = &ddp->adc_seq;
+	struct adc_channel_cfg *accp = &ddp->adc_cfg;
+	int rc;
+
+	if (!device_is_ready(ddp->adc)) {
+		LOG_ERR("ADC device is not ready %s", ddp->adc->name);
+		return -ENOENT;
+	}
+
+	if (gcp->port) {
+		if (!device_is_ready(gcp->port)) {
+			LOG_ERR("%s: device not ready", gcp->port->name);
+			return -ENOENT;
+		}
+		rc = gpio_pin_configure_dt(gcp, GPIO_OUTPUT_INACTIVE);
+		if (rc != 0) {
+			LOG_ERR("Failed to control feed %s.%u: %d",
+				gcp->port->name, gcp->pin, rc);
+			return rc;
+		}
+	}
+
+	*asp = (struct adc_sequence){
+		.channels = BIT(0),
+		.buffer = &ddp->raw,
+		.buffer_size = sizeof(ddp->raw),
+		.oversampling = 4,
+		.calibrate = true,
+	};
+
+#ifdef CONFIG_ADC_NRFX_SAADC
+	*accp = (struct adc_channel_cfg){
+		.gain = BATTERY_ADC_GAIN,
+		.reference = ADC_REF_INTERNAL,
+		.acquisition_time = ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 40),
+	};
+
+	if (cfg->output_ohm != 0) {
+		accp->input_positive = SAADC_CH_PSELP_PSELP_AnalogInput0
+			+ iocp->channel;
+	} else {
+		accp->input_positive = SAADC_CH_PSELP_PSELP_VDD;
+	}
+
+	asp->resolution = 14;
+#else /* CONFIG_ADC_var */
+#error Unsupported ADC
+#endif /* CONFIG_ADC_var */
+
+	rc = adc_channel_setup(ddp->adc, accp);
+	LOG_INF("Setup AIN%u got %d", iocp->channel, rc);
+
+	return rc;
+}
+
+static bool battery_ok;
+
+static int battery_setup(void)
+{
+	int rc = divider_setup();
+
+	battery_ok = (rc == 0);
+	LOG_INF("Battery setup: %d %d", rc, battery_ok);
+	return rc;
+}
+
+SYS_INIT(battery_setup, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);
+
+int battery_measure_enable(bool enable)
+{
+	int rc = -ENOENT;
+
+	if (battery_ok) {
+		const struct gpio_dt_spec *gcp = &divider_config.power_gpios;
+
+		rc = 0;
+		if (gcp->port) {
+			rc = gpio_pin_set_dt(gcp, enable);
+		}
+	}
+	return rc;
+}
+
+int battery_sample(void)
+{
+	int rc = -ENOENT;
+
+	if (battery_ok) {
+		struct divider_data *ddp = &divider_data;
+		const struct divider_config *dcp = &divider_config;
+		struct adc_sequence *sp = &ddp->adc_seq;
+
+		rc = adc_read(ddp->adc, sp);
+		sp->calibrate = false;
+		if (rc == 0) {
+			int32_t val = ddp->raw;
+
+			adc_raw_to_millivolts(adc_ref_internal(ddp->adc),
+					      ddp->adc_cfg.gain,
+					      sp->resolution,
+					      &val);
+
+			if (dcp->output_ohm != 0) {
+				rc = val * (uint64_t)dcp->full_ohm
+					/ dcp->output_ohm;
+				LOG_INF("raw %u ~ %u mV => %d mV\n",
+					ddp->raw, val, rc);
+			} else {
+				rc = val;
+				LOG_INF("raw %u ~ %u mV\n", ddp->raw, val);
+			}
+		}
+	}
+
+	return rc;
+}
+
+unsigned int battery_level_pptt(unsigned int batt_mV,
+				const struct battery_level_point *curve)
+{
+	const struct battery_level_point *pb = curve;
+
+	if (batt_mV >= pb->lvl_mV) {
+		/* Measured voltage above highest point, cap at maximum. */
+		return pb->lvl_pptt;
+	}
+	/* Go down to the last point at or below the measured voltage. */
+	while ((pb->lvl_pptt > 0)
+	       && (batt_mV < pb->lvl_mV)) {
+		++pb;
+	}
+	if (batt_mV < pb->lvl_mV) {
+		/* Below lowest point, cap at minimum */
+		return pb->lvl_pptt;
+	}
+
+	/* Linear interpolation between below and above points. */
+	const struct battery_level_point *pa = pb - 1;
+
+	return pb->lvl_pptt
+	       + ((pa->lvl_pptt - pb->lvl_pptt)
+		  * (batt_mV - pb->lvl_mV)
+		  / (pa->lvl_mV - pb->lvl_mV));
+}

nodes/src/modules/battery.h

@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2018-2019 Peter Bigot Consulting, LLC
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef APPLICATION_BATTERY_H_
+#define APPLICATION_BATTERY_H_
+
+/** Enable or disable measurement of the battery voltage.
+ *
+ * @param enable true to enable, false to disable
+ *
+ * @return zero on success, or a negative error code.
+ */
+int battery_measure_enable(bool enable);
+
+/** Measure the battery voltage.
+ *
+ * @return the battery voltage in millivolts, or a negative error
+ * code.
+ */
+int battery_sample(void);
+
+/** A point in a battery discharge curve sequence.
+ *
+ * A discharge curve is defined as a sequence of these points, where
+ * the first point has #lvl_pptt set to 10000 and the last point has
+ * #lvl_pptt set to zero.  Both #lvl_pptt and #lvl_mV should be
+ * monotonic decreasing within the sequence.
+ */
+struct battery_level_point {
+	/** Remaining life at #lvl_mV. */
+	uint16_t lvl_pptt;
+
+	/** Battery voltage at #lvl_pptt remaining life. */
+	uint16_t lvl_mV;
+};
+
+/** Calculate the estimated battery level based on a measured voltage.
+ *
+ * @param batt_mV a measured battery voltage level.
+ *
+ * @param curve the discharge curve for the type of battery installed
+ * on the system.
+ *
+ * @return the estimated remaining capacity in parts per ten
+ * thousand.
+ */
+unsigned int battery_level_pptt(unsigned int batt_mV,
+				const struct battery_level_point *curve);
+
+#endif /* APPLICATION_BATTERY_H_ */

nodes/src/supervisor.c

@@ -0,0 +1,75 @@
+#include "supervisor.h"
+
+const int SLEEP_GRANULARITY = 1;                    // [min]
+const int SLEEP_MIN_DURATION = SLEEP_GRANULARITY;   // [min]
+const int SLEEP_MAX_DURATION = 30;                  // [min]
+
+// Zephyr related stuff
+
+void thread_supervisor(){
+    supervisor_init();
+    supervisor_run();
+    //should never return
+}
+
+// supervisor stuff
+
+enum error_code supervisor_init(){
+    enum error_code ret = init_failed;
+    if(
+        success == ble_init() &&
+        success == co2_lvl_init() &&
+        success == hygro_init() &&
+        success == thermo_init() &&
+        success == window_init() &&
+        success == battery_init()
+    ){
+        ret = success;
+    }else{}
+    return ret;
+}
+
+enum error_code supervisor_run(){
+    int co2_lvl_value = -1;
+    int hygro_value = -1;
+    int thermo_value = -1;
+    int batt_value = -1;
+    enum window_status window_value = unknown;
+    enum error_code co2_lvl_status, hygro_status, thermo_status, window_status, batt_status;
+    int current_sleep_time = SLEEP_MIN_DURATION;
+    while(1){
+        co2_lvl_status = co2_lvl_get_value(&co2_lvl_value);
+        hygro_status = hygro_get_value(&hygro_value);
+        thermo_status = thermo_get_value(&thermo_value);
+        window_status = window_get_value(&window_value);
+        batt_status = battery_get_value(&batt_value);
+        if(success != window_status){
+            window_value = unknown;
+        }else{}
+        if(success != hygro_status){
+            hygro_value = -1;
+        }else{}
+        if(success != thermo_status){
+            thermo_value = -1;
+        }else{}
+        if(success != co2_lvl_status){
+            co2_lvl_value = -1;
+        }else{}
+        if(success != batt_status){
+            batt_value = -1;
+        }else{}
+        ble_advertise(window_value, hygro_value, thermo_value, co2_lvl_value, batt_value);
+        if((co2_lvl_value > CO2_LEVEL_EMPTY_ROOM) || (window_value == open)){
+            // there are people in the room, or someone forgot to close the window
+            current_sleep_time = SLEEP_MIN_DURATION;
+        }else{
+            // no one is in the room, we can wait a litle bit longer before getting the next data point
+            current_sleep_time += SLEEP_GRANULARITY;
+            if(current_sleep_time > SLEEP_MAX_DURATION){
+                current_sleep_time = SLEEP_MAX_DURATION;
+            }else{}
+        }
+        k_sleep(K_MINUTES(current_sleep_time));
+    }
+    return error_unknown;   // should never return
+}

nodes/src/supervisor.h

@@ -0,0 +1,38 @@
+#ifndef SUPERVISOR_H
+#define SUPERVISOR_H
+
+#include <zephyr/kernel.h>
+
+#include "error_code.h"
+
+#include "ble_advertiser.h"
+#include "window_status.h"
+#include "thermometer.h"
+#include "hygrometer.h"
+#include "co2_level.h"
+#include "battery_percent.h"
+
+extern const int SLEEP_GRANULARITY;     // [min]
+extern const int SLEEP_MIN_DURATION;    // [min]
+extern const int SLEEP_MAX_DURATION;    // [min]
+
+/**
+*   @brief  thread function to run the supervisor in zephyr environment
+*/
+void thread_supervisor();
+
+/**
+*   @brief  init the supervisor, and thus the complete plein_de_ee application
+*   @return init_failed upon any error occurring during the initialisation of any module
+*   @return success     otherwise
+*/
+enum error_code supervisor_init();
+
+/**
+*   @brief  exexcute the plein_de_eeeeeee application
+*   @return error_unknown
+*   @note   should never return
+*/
+enum error_code supervisor_run();
+
+#endif //SUPERVISOR_H

nodes/src/thermometer.c

@@ -0,0 +1,23 @@
+#include "thermometer.h"
+
+static const struct device* dev = DEVICE_DT_GET_ONE(st_hts221);
+
+enum error_code thermo_init(){
+    enum error_code ret = init_failed;
+    if(device_is_ready(dev)){
+        ret = success;
+    }else{}
+    return ret;
+}
+
+enum error_code thermo_get_value(int* holder){
+    enum error_code ret = read_failed;
+    struct sensor_value temp;
+    if( (sensor_sample_fetch(dev) >= 0) &&
+        (sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &temp) >= 0) 
+    ){
+        *holder = sensor_value_to_deci(&temp);
+        ret = success;
+    }else{}
+    return ret;
+}

nodes/src/thermometer.h

@@ -0,0 +1,26 @@
+#ifndef THERMOMETER_H
+#define THERMOMETER_H
+
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+#include <zephyr/drivers/sensor.h>
+
+#include "error_code.h"
+
+/**
+*   @brief  init the thermometer module
+*   @return init_failed upon any error during init
+*   @return success     otherwise
+*/
+enum error_code thermo_init();
+
+/**
+*   @brief      Retrieve the temperature and stores it in the given parameter
+*   @param[out] holder : pointer where the measurement will be stored
+*   @return     read_failed upon any error occuring during measurement
+*   @return     success     otherwise
+*   @note       the content of holder should not be trusted upon returning something else than success
+*/
+enum error_code thermo_get_value(int* holder);
+
+#endif //THERMOMETER_H

nodes/src/window_status.c

@@ -0,0 +1,17 @@
+#include "window_status.h"
+
+static const struct gpio_dt_spec window_switch = GPIO_DT_SPEC_GET(DT_NODELABEL(window_switch), gpios);
+
+enum error_code window_init(){
+    enum error_code ret = init_failed;
+    if(gpio_is_ready_dt(&window_switch) && (0 == gpio_pin_configure_dt(&window_switch, GPIO_INPUT))){
+        ret = success;
+    }else{}
+    return ret;
+}
+
+enum error_code window_get_value(enum window_status* holder){
+    // active high
+    *holder = (gpio_pin_get_dt(&window_switch) ? closed : open);
+    return success;
+}

nodes/src/window_status.h

@@ -0,0 +1,31 @@
+#ifndef WINDOW_STATUS_H
+#define WINDOW_STATUS_H
+
+#include <zephyr/drivers/gpio.h>
+
+#include "error_code.h"
+
+enum window_status{
+    closed = 0,             // window is closed or sensor is not connected
+    open,                   // window is opened
+    unknown,                // window opening status could not be read
+    windows_status_last,    // iteration purpose
+};
+
+/**
+*   @brief  init the window opening status module
+*   @return init_failed upon any error during init
+*   @return success     otherwise
+*/
+enum error_code window_init();
+
+/**
+*   @brief      Retrieve the window opening status and stores it in the given parameter
+*   @param[out] holder : pointer where the measurement will be stored
+*   @return     read_failed upon any error occuring during measurement
+*   @return     success     otherwise
+*   @note       the content of holder should not be trusted upon returning something else than success
+*/
+enum error_code window_get_value(enum window_status* holder);
+
+#endif //WINDOW_STATUS_