void hnd_get_async(coap_context_t *ctx, struct coap_resource_t *resource,
coap_address_t *peer, coap_pdu_t *request, str *token,
coap_pdu_t *response) {
coap_opt_iterator_t opt_iter;
coap_opt_t *option;
unsigned long delay = 5;
size_t size;
if (async) {
if (async->id != request->hdr->id) {
coap_opt_filter_t f;
coap_option_filter_clear(f);
response->hdr->code = COAP_RESPONSE_CODE(503);
}
return;
}
option = coap_check_option(request, COAP_OPTION_URI_QUERY, &opt_iter);
if (option) {
unsigned char *p = COAP_OPT_VALUE(option);
delay = 0;
for (size = COAP_OPT_LENGTH(option); size; --size, ++p)
delay = delay * 10 + (*p - '0');
}
async = coap_register_async(ctx, peer, request,
COAP_ASYNC_SEPARATE | COAP_ASYNC_CONFIRM,
(void *)(COAP_TICKS_PER_SECOND * delay));
}
/*
* The resource handler
*/
static void
hello_async_handler(coap_context_t *ctx, struct coap_resource_t *resource,
const coap_endpoint_t *local_interface, coap_address_t *peer,
coap_pdu_t *request, str *token, coap_pdu_t *response)
{
async = coap_register_async(ctx, peer, request, COAP_ASYNC_SEPARATE | COAP_ASYNC_CONFIRM, (void*)"no data");
}
/* handler for TD_COAP_CORE_16 */
void
hnd_get_separate(coap_context_t *ctx, struct coap_resource_t *resource,
coap_address_t *peer, coap_pdu_t *request, str *token,
coap_pdu_t *response) {
coap_opt_iterator_t opt_iter;
coap_opt_t *option;
coap_opt_filter_t f;
unsigned long delay = 5;
(void)resource;
(void)token;
if (async) {
if (async->id != request->hdr->id) {
coap_opt_filter_t f;
coap_option_filter_clear(f);
response->hdr->code = COAP_RESPONSE_CODE(503);
}
return;
}
/* search for option delay in query list */
coap_option_filter_clear(f);
coap_option_setb(f, COAP_OPTION_URI_QUERY);
coap_option_iterator_init(request, &opt_iter, f);
while ((option = coap_option_next(&opt_iter))) {
if (strncmp("delay=", (char *)COAP_OPT_VALUE(option), 6) == 0) {
int i;
unsigned long d = 0;
for (i = 6; i < COAP_OPT_LENGTH(option); ++i)
d = d * 10 + COAP_OPT_VALUE(option)[i] - '0';
/* don't allow delay to be less than COAP_RESOURCE_CHECK_TIME*/
delay = d < COAP_RESOURCE_CHECK_TIME_SEC
? COAP_RESOURCE_CHECK_TIME_SEC
: d;
debug("set delay to %lu\n", delay);
break;
}
}
async = coap_register_async(ctx, peer, request, COAP_ASYNC_SEPARATE,
(void *)(COAP_TICKS_PER_SECOND * delay));
}
