https://devzone.nordicsemi.com/f/nordic-q-a/77263/bulk-reliable-mesh-message-limited-to-50-bytesHi, We are trying to send a mesh packets containing 72 bytes from client to server with reliable message transmission method (Using access_model_reliable_cancel() based on the light switch example). We modified the transmission packet structure anden-USTelligent Community 13Tue, 20 Jul 2021 14:00:15 GMThttps://devzone.nordicsemi.com/thread/320941?ContentTypeID=1Tue, 20 Jul 2021 14:00:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fb4c8de8-f4cd-4036-af27-ac9d0104242dtesc<p>Hi,</p> <p>The fact that instaburst solves the issue points in the direction of possibly a cap on number of packets in a segmented message, or possibly buffer sizes (if they scale with segment size, as Instaburst is increasing segment size through the use of advertiser extensions.)</p> <p>Is the limit at 50 bytes exactly? Have you done any debugging and/or packet sniffing to see what gets sent over the air?</p> <p>If you are manually cancelling the message, might it be due to segmented messages getting sent in individual packets with some delay between each packet, and then timing out before all such packets are sent?</p> <p>I also see there is some time since you asked the question, have you come any further in the mean time?</p> <p>Regards,<br />Terje</p><div style="clear:both;"></div>