How Do I Use the libcoap Component to Receive and Send Coap Packets in the Same Function?

[shenhaicheng]

Is your feature request related to a problem? Please describe.

Currently, an api needs to be provided. I need to send CoAP packets in the api and set the response to the output parameter.

Describe the solution you would like

A function that can process responses synchronously is required. Is this function supported in the current version? Thank you so much for supporting!

[mrdeep1]

I'm trying to understand what you are looking for here. Are you looking for something like

/*
 * Send a request PDU and wait for the response PDU.
 * 
 * @param request_pdu The requesting PDU. This PDU cannot contain the Observe CoAP option. 
 * @param response_pdu If there is a response, the response PDU is put here.
 *                      This PDU must be freed off by the caller after processing.
 *
 * @return @c 1 if success, else @c 0 on failure (response_pdu set to NULL). request_pdu is always freed off.
 */
int coap_send_recv(coap_pdu_t* request_pdu, coap_pdu_t** response_pdu);

[shenhaicheng]

I'm trying to understand what you are looking for here. Are you looking for something like

/*
 * Send a request PDU and wait for the response PDU.
 * 
 * @param request_pdu The requesting PDU. This PDU cannot contain the Observe CoAP option. 
 * @param response_pdu If there is a response, the response PDU is put here.
 *                      This PDU must be freed off by the caller after processing.
 *
 * @return @c 1 if success, else @c 0 on failure (response_pdu set to NULL). request_pdu is always freed off.
 */
int coap_send_recv(coap_pdu_t* request_pdu, coap_pdu_t** response_pdu);

Yes, I'm really looking for this，but I can‘t find this interface. T.T

[mrdeep1]

Yes, I'm really looking for thisbut I can‘t find this interface. T.T

This interface does not exist - someone needs to write it - I don't have spare time at present.

[mrdeep1]

@shenhaicheng Appreciate that time has passed, but please try out #1538 where there is not support for coap_send_recv().