https://devzone.nordicsemi.com/f/nordic-q-a/68543/manage-a-response-timeout-coap-threadHello, I have an application based on the example &quot;ble_thread_dyn_mtd_coap_cli_pca10056_s140&quot;. When a confirmable message has not received a response, I receive the error (OT_ERROR_RESPONSE_TIMEOUT) in the response handler. Here are my questions:en-USTelligent Community 13Thu, 19 Nov 2020 16:09:59 GMThttps://devzone.nordicsemi.com/thread/280962?ContentTypeID=1Thu, 19 Nov 2020 16:09:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:97d75e12-4315-4a6c-bdbc-c0fd03302824J&#248;rgen Holmefjord<p>Hi,</p> [quote user=""]- How can we know which message this timeout corresponds to? [/quote] <p>You can use the p_context parameter to pass any variable notifying your own application about the message type that caused the response. The context parameter is input to the last argument to&nbsp;otCoapSendRequest().</p> [quote user=""]Do we still have access to the send buffer at this time?[/quote] <p>No, the message is freed right before the handler is called, see <a href="https://github.com/openthread/openthread/blob/c6a258e3a5bd90aa26d8245c435c0ae5797027f4/src/core/coap/coap.cpp#L400">this function</a>.</p> [quote user=""]- How can we reduce the time needed before having a timeout?[/quote] <p>The ACK timeout and re-transmit numbers can be set in&nbsp;<span><a href="https://infocenter.nordicsemi.com/topic/sdk_tz_v4.1.0/structot_coap_tx_parameters.html">otCoapTxParameters</a>. You can then pass this parameter to&nbsp;<a href="https://infocenter.nordicsemi.com/topic/sdk_tz_v4.1.0/group__api-coap.html#gace3de6a217f540d8fe26bbf7834400e3">otCoapSendRequestWithParameters</a>().</span></p> <p><span>Best regards,<br />Jørgen</span></p><div style="clear:both;"></div>