Hello world support for UDP broadcasts over the LAN on ESP32 (#5779)

* UDP local area network meshing on ESP32

* Logs

* Comment

* Update UdpMulticastThread.h

* Changes

* Only use router->send

src/main.cpp

@@ -114,6 +114,11 @@ AccelerometerThread *accelerometerThread = nullptr;
 AudioThread *audioThread = nullptr;
 #endif
 
+#ifdef HAS_UDP_MULTICAST
+#include "mesh/udp/UdpMulticastThread.h"
+UdpMulticastThread *udpThread = nullptr;
+#endif
+
 #if defined(TCXO_OPTIONAL)
 float tcxoVoltage = SX126X_DIO3_TCXO_VOLTAGE; // if TCXO is optional, put this here so it can be changed further down.
 #endif
@@ -783,6 +788,11 @@ void setup()
     LOG_DEBUG("Start audio thread");
     audioThread = new AudioThread();
 #endif
+
+#ifdef HAS_UDP_MULTICAST
+    LOG_DEBUG("Start multicast thread");
+    udpThread = new UdpMulticastThread();
+#endif
     service = new MeshService();
     service->init();
 
@@ -1278,4 +1288,4 @@ void loop()
         mainDelay.delay(delayMsec);
     }
 }
-#endif
+#endif