https://devzone.nordicsemi.com/f/nordic-q-a/8846/esb-tx-rx-alternativeHi. I&#39;m trying to communicate with legacy nRF24L01P using nrf51822. I received packet from nrf24l01p, but I can&#39;t send information back. The data I should send is more than 20bytes, so I cannot use ACK payload. I need to re-initialize nrf esb to PTXen-USTelligent Community 13Fri, 21 Aug 2015 12:37:33 GMThttps://devzone.nordicsemi.com/thread/32524?ContentTypeID=1Fri, 21 Aug 2015 12:37:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c73f13a5-9b18-498a-8314-7c03e977c101Hung Bui<p>@LKH: Have you tried to call nrf_esb_disable() and then call nrf_esb_init() again with the new role ? However, if you plan to switch back role again after that, you may have to deal with synchronization between roles of 2 devices</p> <p>Another easier solution is to send a dummy second packet from the nRF24L01p to the nRF51 then the nRF51 can send and ACK packet, so you can transmit more than 20 bytes.</p><div style="clear:both;"></div>