Callbacks for time critical functions

[motters]

Hello Everyone,

We recently had an issue with OT where the devices were taking too long to respond to parent requests (Child ID Timeout) (https://github.com/orgs/openthread/discussions/9667#discussioncomment-8162650). As the device is a safety device, we need to sample and process data constantly. As such OT becomes a 2nd class citizen, so to speak.

Is there a way to register a function that is called before/after OT performs certain time sensitive tasks?

As in our case it would allow the callback to pause DSP for a short while.

For example,

[...]

openthread_register_event_callback(handle_openthread_event)

[...]

void handle_openthread_event(enum openthread_events event)
{
    switch(event)
    {
	case PARENT_REQUEST:
             // Pause intensive dsp
        break;
        case PARENT_REQUEST_FINISHED:
             // Start intensive dsp
        break;

        [...]

    }
}

Thanks,

Sam

P.S

I thought it'd be best to open a new discussion on this. As it's not directly related to our last discussion.

[jwhui]

As a network protocol, Thread specifies expected response times and timeouts to handle packet transmission failures. As a result, any Thread protocol interaction will have some required time bound.

If you haven't already, I would consider looking into some mechanism that allows OpenThread to execute concurrently with other tasks, either an RTOS that supports multi-threading or a separate MCU / core that with separate execution contexts.