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Visit: Web Bluetooth App
When device is plugged in it will automatically assume a standard stop light operating mode which randomly picks a 10-90 second delay before changing. The yellow light is the standard delay for a 35mph road in the United States.
| State | Name |
|---|---|
| G | Green |
| Y | Yellow |
| R | Red |
The mode is how the device operates its lights. Autometical will automatically pick random timings between Green and Red. Flashing will flash the current light.
| Mode | Name |
|---|---|
| O | Off - Lights turned off |
| A | Automatic - Timings are automatic between 10 and 90 seconds |
| M | Manual - Light stays fixed on current state |
| F | Flashing - Light flashes at 1hz |
The device can automatically connect to a MQTT server to send and receive status updates.
MQTT TOPICS:
- traffic/{customer-key}/{device-mac-address}/state - device listens for state changes
- traffic/{customer-key}/{device-mac-address}/state/current - device publishes state changes
The device automatically broadcasts a bluetooth BLE beacon advertising the core UART service.
When connecting to the device it will automatically flash all lights indicating successful connection.
Telemetry details is streamed over the UART TX characteristic
Device Name: Traffic-Light
Standard BLE UART Service ID: 6e400001-b5a3-f393-e0a9-e50e24dcca9e
| Attrib | ID | Write | Read | Notify |
|---|---|---|---|---|
| UART RX | 6E400002-B5A3-F393-E0A9-E50E24DCCA9E | [X] | ||
| UART TX | 6E400003-B5A3-F393-E0A9-E50E24DCCA9E | [X] | [X] |
Standard Device Information Service ID: 0000180a-0000-1000-8000-00805f9b34fb
| Attrib | ID | Write | Read | Notify |
|---|---|---|---|---|
| Make | 0x2a29 | [X] | ||
| Model | 0x2a24 | [X] | ||
| Serial | 0x2a25 | [X] | ||
| Hardware Ver | 0x2a26 | [X] | ||
| Firmware Ver | 0x2a28 | [X] | ||
| CPU Temperature | 0x2a1c | [X] | [X] |
The telemetry data that is transmitted from the BLE UART TX attribute is based on the Things Library Telemetry protocol which is based on GPS data over NMEA 0183. Telemetry sentences can be converted right into Things Library Telemetry Event objects which is a simple but powerful data structure.
$801845240|s|m:A|t:26|s:G*17
$801869353|s|m:A|t:23|s:Y*01
$801869357|s|m:A|t:23|s:R*0E