Add broadcasting example

Makefile

@@ -1,4 +1,4 @@
-EXAMPLE_FILES := HelloWorld EchoServer
+EXAMPLE_FILES := HelloWorld EchoServer BroadcastingEchoServer
 THREADED_EXAMPLE_FILES := HelloWorldThreaded EchoServerThreaded
 override CXXFLAGS += -std=c++17 -Isrc -IuSockets/src
 override LDFLAGS += uSockets/*.o -lz

examples/BroadcastingEchoServer.cpp

@@ -0,0 +1,41 @@
+#include "App.h"
+
+int main() {
+    /* ws->getUserData returns one of these */
+    struct PerSocketData {
+
+    };
+
+    /* Very simple WebSocket broadcasting echo server */
+    uWS::App().ws<PerSocketData>("/*", {
+        /* Settings */
+        .compression = uWS::SHARED_COMPRESSOR,
+        .maxPayloadLength = 16 * 1024,
+        .idleTimeout = 10,
+        /* Handlers */
+        .open = [](auto *ws, auto *req) {
+            /* Let's make every connection subscribe to the "broadcast" topic */
+            ws->subscribe("broadcast");
+        },
+        .message = [](auto *ws, std::string_view message, uWS::OpCode opCode) {
+            /* Simply broadcast every single message we get */
+            ws->publish("broadcast", message/*, opCode*/);
+        },
+        .drain = [](auto *ws) {
+            /* Check getBufferedAmount here */
+        },
+        .ping = [](auto *ws) {
+
+        },
+        .pong = [](auto *ws) {
+
+        },
+        .close = [](auto *ws, int code, std::string_view message) {
+            /* We automatically unsubscribe from any topic here */
+        }
+    }).listen(9001, [](auto *token) {
+        if (token) {
+            std::cout << "Listening on port " << 9001 << std::endl;
+        }
+    }).run();
+}