https://devzone.nordicsemi.com/f/nordic-q-a/41988/the-communication-between-nrf24le-host-and-nrf24le-device-over-gazellHello, I used the gzll_host_ack_payload_nrf24le project and gzll_device_nrf24le to test the communiction between two nrf24les over Gazell. The result is that the host could receive the data from the device,but the device coule not receive the ack_payloaden-USTelligent Community 13Wed, 02 Jan 2019 14:16:20 GMThttps://devzone.nordicsemi.com/thread/163475?ContentTypeID=1Wed, 02 Jan 2019 14:16:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7876577d-3863-40c2-b753-a34950a23c5bKenneth<p>Maybe you can debug&nbsp;gzll_ack_payload_write() to check if the code return false or true.</p> <p>Have you modified&nbsp;gzll_params.h compared to example in SDK.</p> <p>Best regards,<br />Kenneth</p><div style="clear:both;"></div>