Data dropped when sending large payload via AT#XMQTTPUBhttps://devzone.nordicsemi.com/f/nordic-q-a/113259/data-dropped-when-sending-large-payload-via-at-xmqttpubI am attempting to stream data in chunks of 65535 bytes from the nRF9160 using data mode from the 2.6.1 version of serial_lte_modem sample code. The nRF9160 receives AT commands via UART. The following are the relevant configurations pertaining to UARTen-USTelligent Community 13Wed, 24 Jul 2024 12:20:30 GMTRE: Data dropped when sending large payload via AT#XMQTTPUBhttps://devzone.nordicsemi.com/thread/495406?ContentTypeID=1Wed, 24 Jul 2024 12:20:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3fca836e-ba39-4f82-a7e6-828d7013410ddejans<p>Hi,<br /><br />Can you test what is the maximum payload size in each of the chunks that does not cause any problem?<br /><br />Best regards,<br />Dejan</p><div style="clear:both;"></div>RE: Data dropped when sending large payload via AT#XMQTTPUBhttps://devzone.nordicsemi.com/thread/495093?ContentTypeID=1Mon, 22 Jul 2024 17:47:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e05890e9-980a-4eb6-b4fb-91036a773b07ben<p>The problem does not exist when I am attempting to send at smaller payload such as 256 bytes.</p> <p>I have already increased the buffer size and number of UART Rx buffers as they have been increased from their default values. I am unable to increase the size of the buffers or the buffer count any further due to memory constraints.</p><div style="clear:both;"></div>RE: Data dropped when sending large payload via AT#XMQTTPUBhttps://devzone.nordicsemi.com/thread/495090?ContentTypeID=1Mon, 22 Jul 2024 17:04:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0e2a3e94-2c17-4f1a-80ae-ec2dc0e9ae52dejans<p>Hi,<br /><br />Do you see the same problem when&nbsp;decreasing the number of bytes in each of the chunks?<br />Have you tried to increase the size of UART Rx buffers?<br />Have you tried to increase the number of UART Rx buffers?<br /><br />Best regards,<br />Dejan</p><div style="clear:both;"></div>