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/*
* Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
#include "net/af.h"
#include "net/sock/udp.h"
#ifdef MICROCOAP_DEBUG
#define ENABLE_DEBUG (1)
#else
#define ENABLE_DEBUG (0)
#endif
#include "debug.h"
#include "coap.h"
static uint8_t _udp_buf[512]; /* udp read buffer (max udp payload size) */
uint8_t scratch_raw[1024]; /* microcoap scratch buffer */
coap_rw_buffer_t scratch_buf = { scratch_raw, sizeof(scratch_raw) };
#define COAP_SERVER_PORT (5683)
/*
* Starts a blocking and never-returning loop dispatching CoAP requests.
*
* When using gnrc, make sure the calling thread has an initialized msg queue.
*/
void microcoap_server_loop(void)
{
static const sock_udp_ep_t local = { .family = AF_INET6,
.port = COAP_SERVER_PORT };
sock_udp_ep_t remote;
sock_udp_t sock;
int rc = sock_udp_create(&sock, &local, NULL, 0);
while (1) {
DEBUG("Waiting for incoming UDP packet...\n");
rc = sock_udp_recv(&sock, (char *)_udp_buf, sizeof(_udp_buf),
SOCK_NO_TIMEOUT, &remote);
if (rc < 0) {
DEBUG("Error in sock_udp_recv(). rc=%u\n", rc);
continue;
}
size_t n = rc;
coap_packet_t pkt;
DEBUG("Received packet: ");
coap_dump(_udp_buf, n, true);
DEBUG("\n");
/* parse UDP packet to CoAP */
if (0 != (rc = coap_parse(&pkt, _udp_buf, n))) {
DEBUG("Bad packet rc=%d\n", rc);
}
else {
coap_packet_t rsppkt;
DEBUG("content:\n");
coap_dumpPacket(&pkt);
/* handle CoAP request */
coap_handle_req(&scratch_buf, &pkt, &rsppkt);
/* build reply */
size_t rsplen = sizeof(_udp_buf);
if ((rc = coap_build(_udp_buf, &rsplen, &rsppkt)) != 0) {
DEBUG("coap_build failed rc=%d\n", rc);
}
else {
DEBUG("Sending packet: ");
coap_dump(_udp_buf, rsplen, true);
DEBUG("\n");
DEBUG("content:\n");
coap_dumpPacket(&rsppkt);
/* send reply via UDP */
rc = sock_udp_send(&sock, _udp_buf, rsplen, &remote);
if (rc < 0) {
DEBUG("Error sending CoAP reply via udp; %u\n", rc);
}
}
}
}
}