esp-matter/examples/zigbee_bridge

Zigbee Bridge

This example demonstrates a Matter-Zigbee Bridge that bridges Zigbee devices to Matter fabric.

The Matter Bridge device is composed of two parts: The RCP running on ESP32-H2 and the bridge app running on ESP32.

See the docs for more information about building and flashing the firmware.

1. Additional Environment Setup

1.1 Hardware connection

Connect the two SoCs via UART, below is an example setup with ESP32 DevKitC and ESP32-H2 DevKitC:

ESP32 Pin	ESP32-H2 Pin
GND	GND
GPIO4	GPIO7
GPIO5	GPIO8

1.2 Build and flash the RCP (ESP32-H2)

cd ${IDF_PATH}/examples/zigbee/esp_zigbee_rcp/
idf.py --preview set-target esp32h2
idf.py -p <port> build flash

The Matter Bridge will run on the ESP32 and Zigbee network will be formed.

2. Post Commissioning Setup

2.1 Discovering Zigbee Devices

You can read the parts list from the Bridge to get the number of the bridged devices.

descriptor read parts-list 0x7283 0x0

If there is no other Zigbee device on the Zigbee Network, you will get an empty result. Example:

Data = [

],

2.2 Setup Zigbee Bulb on ESP32-H2

Build and run Zigbee Bulb app on another ESP32-H2 board.

cd ${IDF_PATH}/examples/zigbee/light_sample/light_bulb
idf.py --preview set-target esp32h2
idf.py -p <port> build flash monitor

The Zigbee Bulb will be added to the Zigbee Network and a dynamic endpoint will be added on the Bridge device. You can read the parts list again to get the dynamic endpoint ID.

descriptor read parts-list 0x7283 0x0

The data will now contain the information of the connected Zigbee devices. Example:

Data = [
    1, 
],

It means that the Zigbee Bulb is added as Endpoint 1 on the Bridge device. You can read the cluster servers list on the dynamic endpoint.

descriptor read server-list 0x7283 0x1

This will give the list of supported server clusters. Example:

OnDescriptorServerListListAttributeResponse: 4 entries
    [1]: 6
    [2]: 29
    [3]: 57
    [4]: 64

2.3 Control the bulb with chip-tool

Now you can control the Zigbee bulb using the chip tool.

onoff toggle 0x7283 0x1

3. Device Performance

3.1 Memory usage

The following is the Memory and Flash Usage.

• Bootup == Device just finished booting up. Device is not commissioned or connected to wifi yet.
• After Commissioning == Device is connected to wifi and is also commissioned and is rebooted.
• device used: esp32c3_devkit_m
• tested on: 6a244a7 (2022-06-16)

	Bootup	After Commissioning
Free Internal Memory	66KB	62KB

Flash Usage: Firmware binary size: 1.5MB

This should give you a good idea about the amount of free memory that is available for you to run your application's code.

Applications that do not require BLE post commissioning, can disable it using app_ble_disable() once commissioning is complete. It is not done explicitly because of a known issue with esp32c3 and will be fixed with the next IDF release (v4.4.2).