NetworkDebugPrinter packet optimization.

wled00/net_debug.h

@@ -7,10 +7,14 @@
 class NetworkDebugPrinter : public Print {
   private:
     WiFiUDP debugUdp; // needs to be here otherwise UDP messages get truncated upon destruction
-    IPAddress debugPrintHostIP;
+    IPAddress debugPrintHostIP = INADDR_NONE;
+    bool udpConnected = false;
   public:
+    virtual ~NetworkDebugPrinter() { flush(); }
     virtual size_t write(uint8_t c);
     virtual size_t write(const uint8_t *buf, size_t s);
+    void begin();
+    void flush();
 };
 
 extern NetworkDebugPrinter NetDebug;