mongoose/examples/udp-ssdp-search/main.c
2022-04-12 14:14:55 +01:00

47 lines
1.5 KiB
C

// Copyright (c) 2022 Cesanta Software Limited
// All rights reserved
#include "mongoose.h"
static const char *s_ssdp_url = "udp://239.255.255.250:1900";
static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
MG_DEBUG(("%p got event: %d %p %p", c, ev, ev_data, fn_data));
if (ev == MG_EV_OPEN) {
c->is_hexdumping = 1;
} else if (ev == MG_EV_RESOLVE) {
// c->rem gets populated with multicast address. Store it in c->label
memcpy(c->label, &c->rem, sizeof(c->rem));
} else if (ev == MG_EV_READ) {
// Each response to the SSDP socket will change c->rem.
// We can now do mg_printf(c, "haha"); to respond back to the remote side.
// But in our case, we should restore the multicast address in order
// to have next search to go to the multicast address
memcpy(&c->rem, c->label, sizeof(c->rem));
}
}
static void tfn(void *param) {
struct mg_connection *c = param;
if (c == NULL) return;
MG_INFO(("Sending M-SEARCH"));
mg_printf(c, "%s",
"M-SEARCH * HTTP/1.1\r\n"
"HOST: 239.255.255.250:1900\r\n"
"MAN: \"ssdp:discover\"\r\n"
"ST: urn:schemas-upnp-org:device:MediaRenderer:1\r\n"
"MX: 5\r\n"
"\r\n");
}
int main(void) {
struct mg_mgr mgr;
static struct mg_connection *c;
mg_mgr_init(&mgr);
c = mg_connect(&mgr, s_ssdp_url, fn, NULL);
mg_timer_add(&mgr, 2000, MG_TIMER_REPEAT | MG_TIMER_RUN_NOW, tfn, c);
while (true) mg_mgr_poll(&mgr, 200);
mg_mgr_free(&mgr);
return 0;
}