https://devzone.nordicsemi.com/f/nordic-q-a/69180/nrf9160-thingy-91-mtu-for-udp-using-serial-lte-modem-appI want to send larger UDP packets from nRF9160 (Thingy:91) using Serial LTE modem app. I am not able to send more than 288 bytes of binary data. How to send larger binary data by UDP in Serial LTE modem please ? - Thingy:91 v1.0.0 - LTE modemen-USTelligent Community 13Sun, 13 Dec 2020 15:03:19 GMThttps://devzone.nordicsemi.com/thread/284650?ContentTypeID=1Sun, 13 Dec 2020 15:03:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0b96407a-d918-40b7-8190-a2add5e80a82Hakon<p>Hello,</p> <p>&nbsp;</p> [quote user=""]Where is this restriction from please ?[/quote] <p>&nbsp;It looks like it is defined in <a href="https://github.com/nrfconnect/sdk-zephyr/blob/cdc4c217fbd0972a4270b4ca546f6d34bf5b120c/include/net/net_ip.h#L416">this file</a>.</p> <p>&nbsp;</p> [quote user=""]How it can be changed in Serial LTE modem app please ?[/quote] <p>&nbsp;You can try changing the number in net_ip.h, but I can&#39;t guarantee that will work. Also, be aware that size will likely be restricted by the bsdlib buffer size BSD_IP_MAX_MESSAGE_SIZE, which is 4k bytes.</p><div style="clear:both;"></div>