https://devzone.nordicsemi.com/f/nordic-q-a/34575/send-receive-a-fix-length-proprietary-packet-in-nrf51822-qfaag0Hi, As well know, the max packet length is 252 byte in nRF51822 proprietary protocol. Would you please tell me how to send / receive 252 byte packet? Where can I found the example file? Thank you, Chianglinen-USTelligent Community 13Tue, 22 May 2018 12:24:51 GMThttps://devzone.nordicsemi.com/thread/132759?ContentTypeID=1Tue, 22 May 2018 12:24:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:419dc877-2935-405a-a691-8901a8f0b5e6ovrebekk<p>Hi</p> <p>You would have to change the&nbsp;NRF_ESB_MAX_PAYLOAD_LENGTH define in nrf_esb.h to support 252 byte payload. By using the standard esb_ptx and esb_prx examples in the SDK you should be able to make this modification, and take advantage of the larger packet size.&nbsp;</p> <p>Please be aware that the&nbsp;NRF_ESB_CREATE_PAYLOAD macro doesn&#39;t work for payloads this large, so you would have to fill the struct manually:</p> <p><code>nrf_esb_payload_t tx_payload = {0};</code><br /><code>tx_payload.data[0] = x;</code><br /><code>tx_payload.data[1] = y;</code><br /><code>.</code><br /><code>.</code></p> <p>Best regards<br />Torbjørn</p><div style="clear:both;"></div>