start moving to new skeleton

tutorials/core/timers/main.c

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+// Copyright (c) 2020 Cesanta Software Limited
+// All rights reserved
+//
+// Example Websocket server with timers. This is a simple Websocket echo
+// server, which sends a message to all connected clients periodically,
+// using timer API.
+
+#include "mongoose.h"
+
+static const char *s_listen_on = "http://localhost:8000";
+static const char *s_web_root = "web_root";
+
+// This RESTful server implements the following endpoints:
+static void fn(struct mg_connection *c, int ev, void *ev_data) {
+  if (ev == MG_EV_HTTP_MSG) {
+    struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+    if (mg_match(hm->uri, mg_str("/websocket"), NULL)) {
+      mg_ws_upgrade(c, hm, NULL);  // Upgrade HTTP to Websocket
+      c->data[0] = 'W';           // Set some unique mark on a connection
+    } else {
+      // Serve static files
+      struct mg_http_serve_opts opts = {.root_dir = s_web_root};
+      mg_http_serve_dir(c, ev_data, &opts);
+    }
+  } else if (ev == MG_EV_WS_MSG) {
+    // Got websocket frame. Received data is wm->data. Echo it back!
+    struct mg_ws_message *wm = (struct mg_ws_message *) ev_data;
+    mg_ws_send(c, wm->data.buf, wm->data.len, WEBSOCKET_OP_TEXT);
+    mg_iobuf_del(&c->recv, 0, c->recv.len);
+  }
+}
+
+static void timer_fn(void *arg) {
+  struct mg_mgr *mgr = (struct mg_mgr *) arg;
+  // Broadcast "hi" message to all connected websocket clients.
+  // Traverse over all connections
+  for (struct mg_connection *c = mgr->conns; c != NULL; c = c->next) {
+    // Send only to marked connections
+    if (c->data[0] == 'W') mg_ws_send(c, "hi", 2, WEBSOCKET_OP_TEXT);
+  }
+}
+
+int main(void) {
+  struct mg_mgr mgr;        // Event manager
+  mg_mgr_init(&mgr);        // Initialise event manager
+  mg_log_set(MG_LL_DEBUG);  // Set log level
+  mg_timer_add(&mgr, 1000, MG_TIMER_REPEAT, timer_fn, &mgr);
+  mg_http_listen(&mgr, s_listen_on, fn, NULL);  // Create HTTP listener
+  for (;;) mg_mgr_poll(&mgr, 500);              // Infinite event loop
+  mg_mgr_free(&mgr);                            // Free manager resources
+  return 0;
+}