This example starts the OpenThread and Zigbee stacks side-by-side on a single host SoC, sharing one 802.15.4 RCP over UART. The host runs both stacks; the RCP firmware multiplexes them via Spinel IIDs.

What It Demonstrates

Shared RCP backend initialization via esp_radio_spinel_multipan_init() before either stack starts. This opens the UART RCP once; OpenThread and Zigbee then attach as clients.
OpenThread stack startup via esp_openthread_start()
Zigbee 2.0 stack startup via esp_zigbee_init() + esp_zigbee_start()
Shared UART-RCP usage with OpenThread multipan (CONFIG_OPENTHREAD_MULTIPAN_HOST_ENABLE=y)
Auto-start of the OpenThread Border Router on top of multipan

Hardware Setup

You need two chips:

Host chip running this example
802.15.4 RCP chip running examples/openthread/ot_rcp, built with:
- CONFIG_IEEE802154_MULTI_PAN_ENABLE=y
- CONFIG_OPENTHREAD_MULTIPAN_RCP_ENABLE=y

Default UART wiring:

Host pin	RCP pin
`GPIO4`	`TX`
`GPIO5`	`RX`
`GND`	`GND`

The current RCP cannot receive on two 802.15.4 channels at once, so Zigbee and OpenThread must use the same channel. This example forms Zigbee on channel 13. Shared UART pins/port/baud and OT/ZB defaults are in main/esp_multipan_config.h.

Build and Flash

Flash the RCP first, then this example on the host:

# RCP — enable CONFIG_IEEE802154_MULTI_PAN_ENABLE and CONFIG_OPENTHREAD_MULTIPAN_RCP_ENABLE
cd $IDF_PATH/examples/openthread/ot_rcp
idf.py set-target <rcp-target>
idf.py menuconfig
# Component config → IEEE 802.15.4 → Enable multi-pan feature for frame filter
# Component config → OpenThread → Thread Core Features → Enable Multipan RCP
idf.py build flash

# Host
cd $IDF_PATH/examples/openthread/ot_zb_multipan
idf.py set-target <your-target>
idf.py build flash monitor

Default Behaviour

sdkconfig.defaults ships with:

CONFIG_OPENTHREAD_MULTIPAN_HOST_ENABLE=y
CONFIG_OPENTHREAD_BORDER_ROUTER=y
CONFIG_ZB_ZCZR=y (Zigbee coordinator/router)
CONFIG_ZB_RADIO_SPINEL_UART=y (Zigbee uses the shared UART RCP)

On boot you should see, in order:

OpenThread stack started.
Zigbee stack started followed by Zigbee network formed: pan_id=....

Testing Zigbee Join

Flash another ESP32 (capable of 802.15.4) with examples/zigbee/light_sample/HA_on_off_light. After this host forms the Zigbee network and opens the network for 180 s, the light sample should join automatically.

Then bring up Wi-Fi and Thread the usual way:

> ot wifi connect -s <ssid> -p <password>
> ot dataset init new
> ot dataset channel 13
> ot dataset commit active
> ot ifconfig up
> ot thread start