67 lines
1.3 KiB
Typst
67 lines
1.3 KiB
Typst
#import "/metadata.typ": *
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#import "/tail/bibliography.typ": *
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#import "/tail/glossary.typ": *
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#import "/main/architecture/description.typ": *
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#import "/resources/slides.typ": *
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== Gateway — BLE to MQTT Bridge
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#slide[
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#grid(
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columns: (1fr, 1fr),
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gutter: 2em,
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[
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*Architecture*
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- Raspberry Pi 4 — Python
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- Passive BLE scan (bleak)
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- MQTTS publisher (paho-mqtt)
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- systemd service — auto-restart
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- Remote access via Tailscale
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],
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[
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*Data flow*
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Thingy:52
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-> BLE advertising
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Raspberry Pi
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-> MQTTS (TLS)
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RabbitMQ broker
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->
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InfluxDB
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]
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)
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]
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== Gateway — Key Challenges
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#slide[
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#grid(
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columns: (1fr, 1fr),
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gutter: 2em,
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[
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*BLE filtering*
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- GATT → passive advertising
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(BlueZ limitation)
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- Filter: `company_id = 0xffff`
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- exactly 14 bytes
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- Continuous BLE scan (100% duty cycle)
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- Deduplication: 10s cache per MAC address
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],
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[
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*Reliability*
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- MQTT auto-restart via systemd
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- `os._exit(1)` on disconnection
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- Validated with 2 cases:
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- Network disconnection
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- Wrong MQTT credentials
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]
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)
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]
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== Gateway — Data Collection Flow
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#slide[
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#align(center)[
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#image("/resources/img/sequence_data_collection.svg", height: 85%)
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]
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] |