I am running a nrf52840 dev board as an NCP connected to a RASPBERRY Pi running wpantund. I have 10 other nrf52840 devices in the network. The PI has LIBCOAP coap-client on it sending COAP packets to the other devices at a rate of 1 per second. After about 1 hour the NCP will stop transmitting.
The return from the NCP is
Oct 17 13:00:14 r1 wpantund[1695]: [NCP->] CMD_PROP_VALUE_IS(PROP_LAST_STATUS) tid:0
Oct 17 13:00:14 r1 wpantund[1695]: [-NCP-]: Last status (STATUS_NOMEM, 11)
I have been in Contact with Johnathan *** through the THREAD USERS Group and he has looked at the syslog and RTT logs. His suggestion was to contact Nordic support. I can get you the logs or they are available on the the thread user group. The Topic is NCP status NO_MEM. Johnathan pulled this snippet from the RTT log.
$ cat NCP_101817_1252_RTT.log | grep Sent
...
0> [0004290560] -MAC-----: Sent IPv6 UDP msg, len:77, chksum:ae13, to:0x5c00, sec:yes, prio:low
0> [0004290567] -MLE-----: Sent link request
0> [0004290573] -MAC-----: Sent IPv6 UDP msg, len:95, chksum:e68f, to:0xffff, sec:no, prio:high
0> [0004290747] -MLE-----: Sent link accept
0> [0004290753] -MAC-----: Sent IPv6 UDP msg, len:107, chksum:a894, to:b227a3406e162b82, sec:no, prio:high
0> [0004291154] -MAC-----: Sent IPv6 UDP msg, len:75, chksum:af6a, to:0xffff, sec:yes, prio:low
0> [0004291188] -MLE-----: Sent advertisement
0> [0004291194] -MAC-----: Sent IPv6 UDP msg, len:91, chksum:825a, to:0xffff, sec:no, prio:high
0> [0004291202] -MLE-----: Sent link accept
0> [0004291208] -MAC-----: Sent IPv6 UDP msg, len:97, chksum:2880, to:5a40c9b1f073e26a, sec:no, prio:high
0> [0004292164] -MAC-----: Sent IPv6 UDP msg, len:86, chksum:139b, to:0xffff, sec:yes, prio:low
0> [0004292442] -MLE-----: Sent delayed response
0> [0004292450] -MAC-----: Sent IPv6 UDP msg, len:129, chksum:9374, to:e217f6f202a582ee, sec:no, prio:high
0> [0004293076] -MLE-----: Sent advertisement
0> [0004293079] -MAC-----: Sent IPv6 UDP msg, len:91, chksum:b4be, to:0xffff, sec:no, prio:high
0> [0004293088] -MLE-----: Sent link accept
0> [0004293114] -MAC-----: Sent IPv6 UDP msg, len:97, chksum:0c23, to:b270eb30f2fc8333, sec:no, prio:high
0> [0004293395] -MLE-----: Sent delayed response
0> [0004293457] -MAC-----: Sent IPv6 UDP msg, len:129, chksum:aceb, to:e217f6f202a582ee, sec:no, prio:high
0> [0004294178] -MAC-----: Sent IPv6 UDP msg, len:86, chksum:1f5d, to:0xffff, sec:yes, prio:low
0> [0004296189] -MAC-----: Sent IPv6 UDP msg, len:77, chksum:0ca1, to:0xffff, sec:yes, prio:low
0> [0004296769] -MLE-----: Sent advertisement
0> [0004303861] -MLE-----: Sent advertisement
0> [0004319394] -MLE-----: Sent delayed response
0> [0004320824] -MLE-----: Sent advertisement
0> [0004332413] -MLE-----: Sent delayed response
0> [0004332531] -MLE-----: Sent delayed response
0> [0004332681] -MLE-----: Sent link request
0> [0004333615] -MLE-----: Sent advertisement
0> [0004333944] -MLE-----: Sent link request
0> [0004334793] -MLE-----: Sent link request
0> [0004335390] -MLE-----: Sent advertisement
0> [0004335636] -MLE-----: Sent link request
0> [0004336870] -MLE-----: Sent advertisement
0> [0004338148] -MLE-----: Sent link request
0> [0004338672] -MLE-----: Sent link request
0> [0004341191] -MLE-----: Sent advertisement
0> [0004345556] -MLE-----: Sent link request
0> [0004345971] -MLE-----: Sent advertisement
0> [0004355637] -MLE-----: Sent link request
0> [0004356362] -MLE-----: Sent delayed response
0> [0004357869] -MLE-----: Sent link request
0> [0004357935] -MLE-----: Sent advertisement
0> [0004359076] -MLE-----: Sent advertisement
0> [0004362439] -MLE-----: Sent link request
0> [0004363303] -MLE-----: Sent advertisement
0> [0004368216] -MLE-----: Sent link request
0> [0004371464] -MLE-----: Sent advertisement
