[nrf fromtree] net: lib: coap_client: Release internal request when failed to send

When transmission of first request fails, reset the internal request
buffer as there is no ongoing CoAP transaction.

Application can deal with the failure.

Signed-off-by: Seppo Takalo <[email protected]>
(cherry picked from commit 46b7c84)
(cherry picked from commit 42a691b)

Author: SeppoTakalo

subsys/net/lib/coap/coap_client.c

@@ -69,6 +69,7 @@ static void reset_internal_request(struct coap_client_internal_request *request)
 	request->offset = 0;
 	request->last_id = 0;
 	request->last_response_id = -1;
+	request->request_ongoing = false;
 	reset_block_contexts(request);
 }
 
@@ -426,6 +427,7 @@ int coap_client_req(struct coap_client *client, int sock, const struct sockaddr
 			  &client->address, client->socklen);
 	if (ret < 0) {
 		LOG_ERR("Transmission failed: %d", errno);
+		reset_internal_request(internal_req);
 	} else {
 		/* Do not return the number of bytes sent */
 		ret = 0;