move to new skeleton

tutorials/websocket/websocket-server/main.c

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+// Copyright (c) 2020 Cesanta Software Limited
+// All rights reserved
+//
+// Example Websocket server. See https://mongoose.ws/tutorials/websocket-server/
+
+#include "mongoose.h"
+
+static const char *s_listen_on = "ws://localhost:8000";
+static const char *s_web_root = ".";
+
+// This RESTful server implements the following endpoints:
+//   /websocket - upgrade to Websocket, and implement websocket echo server
+//   /rest - respond with JSON string {"result": 123}
+//   any other URI serves static files from s_web_root
+static void fn(struct mg_connection *c, int ev, void *ev_data) {
+  if (ev == MG_EV_OPEN) {
+    // c->is_hexdumping = 1;
+  } else 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)) {
+      // Upgrade to websocket. From now on, a connection is a full-duplex
+      // Websocket connection, which will receive MG_EV_WS_MSG events.
+      mg_ws_upgrade(c, hm, NULL);
+    } else if (mg_match(hm->uri, mg_str("/rest"), NULL)) {
+      // Serve REST response
+      mg_http_reply(c, 200, "", "{\"result\": %d}\n", 123);
+    } 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);
+  }
+}
+
+int main(void) {
+  struct mg_mgr mgr;  // Event manager
+  mg_mgr_init(&mgr);  // Initialise event manager
+  printf("Starting WS listener on %s/websocket\n", s_listen_on);
+  mg_http_listen(&mgr, s_listen_on, fn, NULL);  // Create HTTP listener
+  for (;;) mg_mgr_poll(&mgr, 1000);             // Infinite event loop
+  mg_mgr_free(&mgr);
+  return 0;
+}