RE: Matter/Thread event indicating "ready to update status" and "status confirmed updated" ?

AMarch — Tue, 09 Apr 2024 12:47:05 GMT

Some redirect, in the V2.6.0 version of the code base, this is now part of the common
void Board::DefaultMatterEventHandler(const ChipDeviceEvent *event, intptr_t /* unused */)

in the v2.6.0\nrf\samples\matter\common\src\board\board.cpp

RE: Matter/Thread event indicating "ready to update status" and "status confirmed updated" ?

Marte Myrvold — Mon, 26 Feb 2024 12:54:04 GMT

Hi,

In our Thread samples we have a callback for when the Thread state changes, for example:

static void on_thread_state_changed(otChangedFlags flags, struct openthread_context *ot_context,
				    void *user_data)
{
	if (flags & OT_CHANGED_THREAD_ROLE) {
		switch (otThreadGetDeviceRole(ot_context->instance)) {
		case OT_DEVICE_ROLE_CHILD:
		case OT_DEVICE_ROLE_ROUTER:
		case OT_DEVICE_ROLE_LEADER:
			k_work_submit(&on_connect_work);
			is_connected = true;
			break;

		case OT_DEVICE_ROLE_DISABLED:
		case OT_DEVICE_ROLE_DETACHED:
		default:
			k_work_submit(&on_disconnect_work);
			is_connected = false;
			break;
		}
	}
}
static struct openthread_state_changed_cb ot_state_chaged_cb = {
	.state_changed_cb = on_thread_state_changed
};

This callback is registered with openthread_state_changed_cb_register():

openthread_state_changed_cb_register(openthread_get_default_context(), &ot_state_chaged_cb);

The Thread device role, given by otThreadGetDeviceRole(), should give you an indication of whether the device is connected to the network or not. Disabled means that the Thread stack is disabled, while detached means that the Thread stack is enabled but the device is currently not connected to a Thread network. Child, router and leader indicates that the device is connected to a network.

In Matter, the ChipEventHandler() function will be called when the Thread state changes. You can use this to know when the device has changed role, and also whether the device is connected to a network or not. This is the relevant part of the function:

case DeviceEventType::kThreadStateChange:
	sIsNetworkProvisioned = ConnectivityMgr().IsThreadProvisioned();
	sIsNetworkEnabled = ConnectivityMgr().IsThreadEnabled();

This should be implemented in the app_task.cpp file, see light_switch/src/app_task.cpp as an example.

Best regards,
Marte