move to new skeleton

tutorials/udp/ssdp-search/main.c

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+// 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) {
+  MG_DEBUG(("%p got event: %d %p", c, ev, ev_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->data
+    memcpy(c->data, &c->rem, sizeof(c->rem));
+  } else if (ev == MG_EV_READ) {
+    MG_INFO(("Got a response"));
+    struct mg_http_message hm;
+    if (mg_http_parse((const char *) c->recv.buf, c->recv.len, &hm) > 0) {
+      size_t i, max = sizeof(hm.headers) / sizeof(hm.headers[0]);
+      // Iterate over request headers
+      for (i = 0; i < max && hm.headers[i].name.len > 0; i++) {
+        struct mg_str *k = &hm.headers[i].name, *v = &hm.headers[i].value;
+        if ((mg_vcasecmp(k, "SERVER") == 0) ||
+            (mg_vcasecmp(k, "LOCATION") == 0)) {
+          printf("\t%.*s -> %.*s\n", (int) k->len, k->buf, (int) v->len,
+                 v->buf);
+        }
+      }
+      printf("\n");
+    }
+    // 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->data, sizeof(c->rem));
+    // Discard the content of this response as we expect each SSDP response
+    // to generate at most one MG_EV_READ event.
+    c->recv.len = 0UL;
+  }
+}
+
+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;
+}