https://devzone.nordicsemi.com/f/nordic-q-a/40063/nrf52-is-there-crc-on-the-ack-payload-whilst-using-gazellHello, I&#39;m trying to implement the Gazell protocol for one of my tasks. I understand there is CRC for the data sent from the device to the host. I cannot however find anywhere that explicitly states that there is a CRC for the ACK payload from the hosten-USTelligent Community 13Thu, 01 Nov 2018 07:37:19 GMThttps://devzone.nordicsemi.com/thread/155473?ContentTypeID=1Thu, 01 Nov 2018 07:37:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e0d014da-8c0d-461a-8f10-78be8f8a48c8AndreasF<p>Hi SP.</p> <p>There is a CRC for every packet, and the packet structure remains the same. (note: The ACK is sent after a normal packet is received)</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/support-attachments/beef5d1b77644c448dabff31668f3a47-e85ae6d070384c1189ca02c8954b98f3/pastedimage1541057831008v1.png" alt=" " /></p> <p>There shouldn&#39;t be any difference in ESB, as Gazell is only a top layer.</p> <p></p> <p>- Andreas</p><div style="clear:both;"></div>