https://devzone.nordicsemi.com/f/nordic-q-a/86945/esb-ack-message-is-not-sent-immediatelyHello, Scenario: 2x nRF52833 - One set as PTX and the second PRX. PTX is connected to my PC via UART. Both boards are initialized with ESB_PROTOCOL_ESB_DPL. I want to send a data packet to PTX via UART, PTX will transmit this packet to PRX, PRXen-USTelligent Community 13Thu, 14 Apr 2022 05:06:41 GMThttps://devzone.nordicsemi.com/thread/363264?ContentTypeID=1Thu, 14 Apr 2022 05:06:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:81f04d15-efb3-4204-a028-7eb8487ba970Vagner Landskron<p>I&#39;m reading the documentation here:&nbsp;194.19.86.155/.../esb.html</p> <p><strong>int&nbsp;<code class="sig-name descname">esb_write_payload</code><span class="sig-paren">(</span><em class="property">const</em><em class="property">struct</em>esb_payload&nbsp;*<em>payload</em></strong><span class="sig-paren"><strong>)</strong><br /></span><em>Write a payload for transmission or acknowledgement.</em><br /><em>This function writes a payload that is added to the queue. When the module is in PTX mode, the payload is queued for a regular transmission. <span style="text-decoration:underline;"><strong>When the module is in PRX mode, the payload is queued for when a packet is received that requires an acknowledgement with payload.</strong></span></em></p> <p></p> <p>And it seems like that what I&#39;m probably doing is preparing the next ACK message in the PRX receive event.</p><div style="clear:both;"></div>