https://devzone.nordicsemi.com/f/nordic-q-a/69642/mqtt-sn-max-packet-idHello, I&#39;m using SDK for Thread and Zigbee v4.1 and I developed a network using mqtt-sn library. Since the developed application requires data publishing at a high rate, I noticed a possible bug in the mqttsn_packet_sender.c file. Function mqttsn_packet_sender_publishen-USTelligent Community 13Fri, 18 Dec 2020 15:56:15 GMThttps://devzone.nordicsemi.com/thread/285891?ContentTypeID=1Fri, 18 Dec 2020 15:56:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e4792787-7cef-4245-bc97-3cf99567a497Didrik Rokhaug<p>Hi,</p> <p>Thanks for your report.</p> <p>While I don&#39;t usually work with our Thread and Zigbee SDK, it looks like you are right.</p> <p>I will report this to our developers.</p> <p>Your fix should solve the problem, though I would probably change the implementation of next_packet_id_get() instead, to always set the value of p_client-&gt;message_id.</p> <p>Best regards,</p> <p>Didrik</p><div style="clear:both;"></div>