This is a simple MQTT to brMesh (Broadlink Fastcon) gateway. It is not a real-world ready app, just a proof of concept. Supports LED lights only, all types.
HomeAssistant video: https://youtu.be/gQ_EAsYz9jI
Compatible lights are those, that can be controlled by brMesh or Broadlink BLE mobile apps.
Be warned - there is also brLight app, while it has the same design as brMesh, the protocol is different.
I have bought MELPO flood lights from Amazon and found they are based on some weird Broadlink mesh, with no direct control possible. Special thanks goes to Moody for his initial research, read his blog here: https://mooody.me/posts/2023-04/reverse-the-fastcon-ble-protocol/ (with translator)
To use this MQTT->brMesh gateway you first need to setup your devices, using Android phone. Or at least the first one. When first device added - Android app generates unique Mesh key. All subsequent devices would use this initial key.
It is possible to handle device registration directly, without an app, but it is outside the scope of this research/poc.
To get the key you need to run "adb logcat | grep jyq", send some commands and wait for a string like
jyq_helper: getPayloadWithInnerRetry---> payload:220300000000000000000000, key: b2fd16aa
Where b2fd16aa would be your mesh key. Second byte in the payload string is light's ID in the mesh, ID 3 in this case.
I have used Ubuntu Linux host with the following Realtek USB stick:
2550:8761 Realtek Bluetooth Radio
I have no idea if other adapters work.
This "gateway" would connect to your MQTT server and subscribe to brMesh topic. Expected control messages are: brMesh/deviceId/set { json payload }
Examples:
brMesh/3/set { "state": "OFF" }
brMesh/3/set { "state": "ON" }
brMesh/3/set { "state": "ON", "color": {"r": 255,"g": 0,"b": 25} }
brMesh/3/set { "state": "ON", "color_temp": 500 }
brMesh/3/set { "state": "ON", "brightness": 40 }To register light in HomeAssistant using MQTT, you can issue:
mosquitto_pub -h MQTT_SERVER_IP -t 'homeassistant/light/brMesh3/config' -m '{ "name":"brMesh3", "schema":"json", "command_topic":"brMesh/3/set", "rgb":"true", "brightness":"true", "optimistic":"true", "color_temp":"false", "effect":"false", "color_temp":"true", "device":{"identifiers":["brmesh2mqtt_3"], "manufacturer":"MELPO","model":"RGB light"}, "unique_id":"brmesh2mqtt_3"}'All the above examples assume your LED light has ID 3.
All "temperature" settings, but the most left "warm white" are ignored.
For now we use shell invocation of btmgmt to set BLE advertising data and it really should be done in a nicer way, programmatically.
Python implementation added, that uses DBus to talk to BlueZ. See python folder for details.