2a7546fe8b
Implement Gateway class that discovers Nordic Thingy:52 nodes via BLE
and publishes sensor data to MQTT broker on each notification received.
- Automatic node discovery via BLE service UUID (ef680100)
- GATT notifications for temperature, humidity and CO2
- Publish immediately on reception to {gateway_id}/{mac}/update
- Connection timeout to avoid blocking on unreachable nodes
- Disconnection detection and automatic reintegration into scan
- Logging with DEBUG/INFO/WARNING/ERROR levels
Assisted-by: Claude:claude-sonnet-4-6 — debugging BLE parallel connections (BlueZ InProgress error), GATT UUID discovery (ef680100 vs ef680200), byte decoding for temperature/humidity/CO2, async connection timeout implementation