ssize_t coap_handle_req(coap_pkt_t *pkt, uint8_t *resp_buf, unsigned resp_buf_len)
{
if (coap_get_code_class(pkt) != COAP_REQ) {
DEBUG("coap_handle_req(): not a request.\n");
return -EBADMSG;
}
if (pkt->hdr->code == 0) {
return coap_build_reply(pkt, COAP_CODE_EMPTY, resp_buf, resp_buf_len, 0);
}
unsigned method_flag = coap_method2flag(coap_get_code_detail(pkt));
for (unsigned i = 0; i < coap_resources_numof; i++) {
const coap_resource_t *resource = &coap_resources[i];
if (!(resource->methods & method_flag)) {
continue;
}
int res = strcmp((char *)pkt->url, resource->path);
if (res > 0) {
continue;
}
else if (res < 0) {
break;
}
else {
return resource->handler(pkt, resp_buf, resp_buf_len, resource->context);
}
}
return coap_build_reply(pkt, COAP_CODE_404, resp_buf, resp_buf_len, 0);
}
/*
* Server callback for /cli/stats. Accepts either a GET or a PUT.
*
* GET: Returns the count of packets sent by the CLI.
* PUT: Updates the count of packets. Rejects an obviously bad request, but
* allows any two byte value for example purposes. Semantically, the only
* valid action is to set the value to 0.
*/
static ssize_t _stats_handler(coap_pkt_t* pdu, uint8_t *buf, size_t len)
{
/* read coap method type in packet */
unsigned method_flag = coap_method2flag(coap_get_code_detail(pdu));
switch(method_flag) {
case COAP_GET:
gcoap_resp_init(pdu, buf, len, COAP_CODE_CONTENT);
/* write the response buffer with the request count value */
size_t payload_len = fmt_u16_dec((char *)pdu->payload, req_count);
return gcoap_finish(pdu, payload_len, COAP_FORMAT_TEXT);
case COAP_PUT:
/* convert the payload to an integer and update the internal
value */
if (pdu->payload_len <= 5) {
char payload[6] = { 0 };
memcpy(payload, (char *)pdu->payload, pdu->payload_len);
req_count = (uint16_t)strtoul(payload, NULL, 10);
return gcoap_response(pdu, buf, len, COAP_CODE_CHANGED);
}
else {
return gcoap_response(pdu, buf, len, COAP_CODE_BAD_REQUEST);
}
}
return 0;
}
/* Handler für den "/dino/move"-Pfad */
static ssize_t _dino_move(coap_pkt_t* pdu, uint8_t *buf, size_t len,
void *ctx)
{
(void)ctx;
/* Wenn die Anfrage eine POST-Anfrage war */
if (coap_method2flag(coap_get_code_detail(pdu)) == COAP_POST) {
/* Wiederverwende den GPIO-IRQ-Callback um den Dino zu bewegen */
_toggle_dino(NULL);
/* Sende eine Antwort, dass die Anfrage erfolgreich bearbeitet wurde */
return gcoap_response(pdu, buf, len, COAP_CODE_VALID);
}
/* sonst */
else {
/* lass die Bibliothek das die Antwort erstellen und senden */
return 0;
}
}
static ssize_t _luke_points(coap_pkt_t* pdu, uint8_t *buf, size_t len,
void *ctx)
{
unsigned p = 0;
unsigned code;
(void)ctx;
switch (coap_method2flag(coap_get_code_detail(pdu))) {
case COAP_GET: {
size_t payload_len;
gcoap_resp_init(pdu, buf, len, COAP_CODE_CONTENT);
mutex_lock(&_points_mutex);
payload_len = sprintf((char *)pdu->payload, LUKE_PAYLOAD_FMT,
_points);
mutex_unlock(&_points_mutex);
return gcoap_finish(pdu, payload_len, COAP_FORMAT_JSON);
}
case COAP_POST:
printf("POST %s\n", (char *)pdu->url);
if ((pdu->payload_len < LUKE_PAYLOAD_MIN_SIZE) ||
(pdu->payload_len > LUKE_PAYLOAD_MAX_SIZE) ||
(pdu->content_type != COAP_FORMAT_JSON) ||
(sscanf((char *)pdu->payload, LUKE_PAYLOAD_FMT, &p) != 1)) {
printf("(%u < %u) || (%u > %u) || (%u != %u) || "
"(payload unparsable)\n", pdu->payload_len,
LUKE_PAYLOAD_MIN_SIZE, pdu->payload_len, LUKE_PAYLOAD_MAX_SIZE,
pdu->content_type, COAP_FORMAT_JSON);
code = COAP_CODE_BAD_REQUEST;
}
else {
code = COAP_CODE_VALID;
_increment_points(p);
}
puts("Sending response");
return gcoap_response(pdu, buf, len, code);
default:
return 0;
}
}
