MQTT QoS 1: Retransmission message when no PUBACK is receivedhttps://devzone.nordicsemi.com/f/nordic-q-a/100272/mqtt-qos-1-retransmission-message-when-no-puback-is-receivedHi, I&#39;m developing an application for nRF9160 that connects to AWS IoT Core using AWS IoT library (of nRF Connect SDK 2.3.0). I want to publish messages with QoS level 1, so, after publishing a message, my code waits until PUBACK is received back. en-USTelligent Community 13Wed, 31 May 2023 14:13:21 GMTRE: MQTT QoS 1: Retransmission message when no PUBACK is receivedhttps://devzone.nordicsemi.com/thread/428511?ContentTypeID=1Wed, 31 May 2023 14:13:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2b9e9810-6169-40ab-b063-cae5ef8c994bCharlie<p>Hi Alejandro,</p> <p>I found there is a QoS library you can maybe use for it.&nbsp;<br /><a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/libraries/others/qos.html">Quality of Service — nRF Connect SDK 2.4.0 documentation (nordicsemi.com)</a></p> <p>Best regards,</p> <p>Charlie</p><div style="clear:both;"></div>RE: MQTT QoS 1: Retransmission message when no PUBACK is receivedhttps://devzone.nordicsemi.com/thread/428500?ContentTypeID=1Wed, 31 May 2023 13:42:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a6a6e52d-4fe8-4bc0-b6e9-a5115c358002Charlie<p>Hi Alejandro,</p> <p>You are correct. <br />You&nbsp;need to implement logic on the application level to send again if PUBACK is not received within some user-defined time.</p> <p>Best regards,</p> <p>Charlie</p><div style="clear:both;"></div>