https://devzone.nordicsemi.com/f/nordic-q-a/19938/nrf24l01-can-not-recieved-nrf51822-ack-in-esbi have a setup with one NRF24L01+ as PTX and one NRF51822 as PRX my problem is that the data sended ok and ack sended to NRF24L01+(i assume that by NRF_ESB_EVENT_TX_SUCCESS) but NRF24L01+ does not recieve it and MAX_RT set!! what is should do foren-USTelligent Community 13Thu, 23 Feb 2017 13:25:59 GMThttps://devzone.nordicsemi.com/thread/77598?ContentTypeID=1Thu, 23 Feb 2017 13:25:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:efbad9b3-d512-47de-a1d2-248b4a14efd4Hung Bui<p>Hi Amir,</p> <p>If you are fine with none Dynamic ACK then it should be fine. If you want Dynamic ACK, you may have to use the NoAckFix I mentioned.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/77597?ContentTypeID=1Thu, 23 Feb 2017 10:39:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:020356d0-037a-43fc-a68c-380424380cdbamir<p>my problem was that in FEATURE register EN_DYN_ACK bit was enable i disable it and it work fine!!!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/77596?ContentTypeID=1Thu, 23 Feb 2017 10:26:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:41d3cf1b-ad2c-4885-9e52-ce1d7307e125Hung Bui<p>Hi Amir,</p> <p>Could you write the configuration on nRF24L01+ and nRF51822 ?</p> <p>There is a bug with the NOACK bit on the ESB library in SDK v11 and up.You may want to try using the NoAckFix mentioned <a href="https://devzone.nordicsemi.com/question/106218/how-to-set-nrf24-ptx-with-ack-payload/">here</a>.</p><div style="clear:both;"></div>