https://devzone.nordicsemi.com/f/nordic-q-a/20911/is-it-possible-to-track-the-delivery-of-a-k-in-the-esb-protocolHi! Faced such an anomaly. In 2-3% of cases when exchanging PTX device sees a transmission error (the ACK did not come) and device PRX is not see this error. Is there a way for device in PRX mode to understand that ACK was successfully delivered toen-USTelligent Community 13Fri, 31 Mar 2017 06:01:48 GMThttps://devzone.nordicsemi.com/thread/81655?ContentTypeID=1Fri, 31 Mar 2017 06:01:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:181e9fae-7a2c-4dd0-b0d3-845d52749d81hamster66<p>Thanks! I get it.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/81654?ContentTypeID=1Thu, 30 Mar 2017 11:52:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1cd561fc-438f-4876-a646-d3133045eb3eovrebekk<p>Hi</p> <p>Do you mean that the packet is received in the PRX, but the PTX does not get the ACK?</p> <p>In a protocol where 0% packet loss is required you would typically retransmit the same packet over and over again until you receive an ACK (instead of giving up after a certain number of retransmits). Then the PRX can assume that if a new packet is received, the previous packet has been successfully ACK&#39;ed. Otherwise there is no way for the PRX to know if the ACK was received or not.</p> <p>For this to work you have to retransmit any packet on the PTX side if the &#39;max retransmit&#39; interrupt occurs, rather than flushing the buffers and sending the next packet.</p> <p>Best regards<br /> Torbjørn</p><div style="clear:both;"></div>