https://devzone.nordicsemi.com/f/nordic-q-a/44871/communication-between-nrf24l01p-and-nrf52840Hi, I want to communicate with a legacy device nrf24l01p+ based using a nrf52840 DK. Firmware of legacy device setup the card in this way: I take the esb_ptx esample from nrf52 SDK and I change setup in this way: But it doesn&#39;t work. Canen-USTelligent Community 13Mon, 18 Mar 2019 09:31:59 GMThttps://devzone.nordicsemi.com/thread/176635?ContentTypeID=1Mon, 18 Mar 2019 09:31:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4cba1aa6-7002-4124-bcec-ec516ccf29b6ovrebekk<p>Hi</p> <p>Address configuration is quite different between the older and newer devices, so I would suggest using the default 0xE7E7E7E7E7 address at the start to verify if things are working. This address is a palindrome of sorts,&nbsp;in that it looks the same even if the bit or byte direction is reversed.&nbsp;</p> <p>If that doesn&#39;t work make sure the configured packet length is identical to the length of the TX payload.&nbsp;</p> <p>Also, I think you need to enable auto acknowledge on your receiver side to be compatible with the nrf_esb library.&nbsp;<br />By disabling auto acknowledge you are reverting back to the legacy ShockBurst mode, which is not supported by the nrf_esb library.&nbsp;</p> <p>Best regards<br />Torbjørn</p><div style="clear:both;"></div>