with lwip, until function coap_new_endpoint return, 'result' is not assigned to context->endpoint

[luminais]

libcoap/src/net.c

Lines 472 to 477 in 1d48484

	if (listen_addr) {
	coap_endpoint_t *endpoint = coap_new_endpoint(c, listen_addr, COAP_PROTO_UDP);
	if (endpoint == NULL) {
	goto onerror;
	}
	}

libcoap/src/coap_io_lwip.c

Lines 105 to 128 in 1d48484

	coap_new_endpoint(coap_context_t *context, const coap_address_t *addr, coap_proto_t proto) {
	coap_endpoint_t *result;
	err_t err;
	LWIP_ASSERT("Proto not supported for LWIP endpoints", proto == COAP_PROTO_UDP);
	result = coap_malloc_type(COAP_ENDPOINT, sizeof(coap_endpoint_t));
	if (!result) return NULL;
	result->sock.pcb = udp_new_ip_type(IPADDR_TYPE_ANY);
	if (result->sock.pcb == NULL) goto error;
	udp_recv(result->sock.pcb, coap_recv, (void*)result);
	err = udp_bind(result->sock.pcb, &addr->addr, addr->port);
	if (err) {
	udp_remove(result->sock.pcb);
	goto error;
	}
	result->default_mtu = COAP_DEFAULT_MTU;
	result->context = context;
	result->proto = proto;
	return result;

[obgm]

You are right, this is indeed missing.

[mrdeep1]

libcoap LwIP support has been re-written in PR #884, and so this should no longer be an issue as the standard coap_new_endpoint() function is now used.

[mrdeep1]

Fixed in #939.