https://devzone.nordicsemi.com/f/nordic-q-a/91116/mqtt-publish-payload-size-limitation-in-serial-lte-modem-app-2-0-0Hello, Our tests and the MQTT publish documentation indicate a payload size limitation of 256 bytes for MQTT publish, which we see is set with an enum in slm_at_mqtt.c. Our understanding is that this limitation is smaller than in previous versions ofen-USTelligent Community 13Tue, 30 Aug 2022 09:53:00 GMThttps://devzone.nordicsemi.com/thread/383847?ContentTypeID=1Tue, 30 Aug 2022 09:53:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:825033a3-5bed-4e5a-8cff-4b8dd924de8aKimberly <p>Great, thanks. I tested the above and was able to send a &gt;2kb string in datamode using the lte ink monitor. Around &gt;2300 bytes, mosquitto received it as smaller packets of varying sizes.&nbsp;&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/382713?ContentTypeID=1Mon, 22 Aug 2022 13:44:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9cf38a0a-d6a5-40e5-b356-50a4af947756Hakon<p>Hello,</p> [quote user=""]Our tests and the <a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/applications/serial_lte_modem/doc/AT_commands_intro.html">MQTT publish documentation </a>indicate a payload size limitation of 256 bytes for&nbsp;MQTT publish, which we see is set with an enum in slm_at_mqtt.c.[/quote] <p>This is the limitation when Publish in command mode.</p> <p>When publish in data mode, it&#39;s close to 4K.</p> <p>Used to be NET_IPV4_MTU(572) in command mode.</p><div style="clear:both;"></div>