How to tell when otUdpSend() transmit is finishedhttps://devzone.nordicsemi.com/f/nordic-q-a/89016/how-to-tell-when-otudpsend-transmit-is-finishedThis ticket is related to an old unanswered case ( Openthread otUdpSend transmit finish ). I need to send a large UDP message in chunks and therefore need to be able to tell when otUdpSend() completes prior to calling again to avoid buffer depletion.en-USTelligent Community 13Thu, 16 Jun 2022 15:19:47 GMTRE: How to tell when otUdpSend() transmit is finishedhttps://devzone.nordicsemi.com/thread/372867?ContentTypeID=1Thu, 16 Jun 2022 15:19:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1cda09d2-dafa-4c2c-b6e4-79ef89ed69ccTristen<p>Thank you&nbsp;<span>J&oslash;rgen. Yes I can add an application ACK. I suppose that is the correct way to handle this anyways.&nbsp;</span></p><div style="clear:both;"></div>RE: How to tell when otUdpSend() transmit is finishedhttps://devzone.nordicsemi.com/thread/372813?ContentTypeID=1Thu, 16 Jun 2022 12:31:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9a52c9f7-4081-49d8-a116-205ad99e6c76J&#248;rgen Holmefjord<p>Hi,</p> <p>Unfortunately, there is no notification back to the application when the UDP message is sent. Can you send an application ACK back from the receiver once the message is received? That way you will also know that the message is received as expected and can proceed with the next chunk.</p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>