Communicate two samr21-xpro Emcute example and gnrc_border_route example

[andyrosete17]

Hi

I'm trying to communicate two devices (samr21-xpro) one of them with emcute (mqtt-sn) example and the gnrc_border_route example, but the con command of emcute example return TimeOut error.

I've added the ip of the gnrc_border_route example to emcute example

(gnrc_border_route)

(emcute with the ip added)

if its executed ping6 command it can receive a response of gnrc example

But when the con command is executed it return a TimeOut error (res= -4) (it say successfully connected but it must be a bug)

After fill the code with debug lines i saw that the line that fail is
thread_t me = (thread_t) sched_active_thread;

this code segment for example

emcute.c
static int syncsend(uint8_t resp, size_t len, bool unlock)
{
int res = EMCUTE_TIMEOUT;
waiton = resp;
timer.arg = (void )sched_active_thread;
/ clear flags, in case the timer was triggered last time right before the
* remove was called */
thread_flags_clear(TFLAGS_ANY);
for (unsigned retries = 0; retries < EMCUTE_N_RETRY; retries++) {
sock_udp_send(&sock, tbuf, len, &gateway);
xtimer_set(&timer, (EMCUTE_T_RETRY * US_PER_SEC));
thread_flags_t flags = thread_flags_wait_any(TFLAGS_ANY);
if (flags & TFLAGS_RESP) {
xtimer_remove(&timer);
res = result;
retries = EMCUTE_N_RETRY;
}

}
 
/* cleanup sync state */
waiton = 0xff;
if (unlock) {
    mutex_unlock(&txlock);
}
DEBUG("The final result = %d\n", res);
return res;

}

---

thread_flag.c
thread_flags_t thread_flags_wait_any(thread_flags_t mask)
{
thread_t me = (thread_t) sched_active_thread;
_thread_flags_wait_any(mask);
thread_flags_t result = _thread_flags_clear_atomic(me, mask);
return result;
}

because it try to inittialize the thread pointer but the flag is always different
if (flags & TFLAGS_RESP)

The values are:
The flag = 0x00000002 (This mean TIMEOUT) and TFLAGS_RESP = 0x00000001

Please is somebody know what do I need to do, I will appreciate a lot an advice.

[andyrosete17]

Hi,

I'm still having problem to connect the devices and establish the communication among then. I have been testing the emcute example in native and it run perfectly but once I want to use the samr21 it fails. I've been trying to test the emcute example with the gnrc_border_router example but I'm not able to communicate them even when I've added the ip and I can execute ping6 and it response is positive.
Please if somebody know how can I resolve this, I will appreciate a lot the help.

Thanks in advance...

[haukepetersen]

Sorry for the (very) late reply.

Just tested your setup also using two samr21-xpro nodes: it worked like a charm. Which mqtt broker did you try to connect to? Did you start one as described in the README of the emcute example? And did you connect to the correct address and port of that mqtt-sn broker?

The success message after a connection timeout is indeed an error, fix is here: #7848

As the example is working here (except for the minor bug fix linked above), I consider this issue solved. Please shout/re-open if needed!