Add dmxInput.isConnected()

wled00/dmx_input.h

@@ -19,6 +19,9 @@ public:
   void disable();
   void enable();
 
+  /// True if dmx is currently connected
+  bool isConnected() const { return connected; }
+
 private:
   /// @return true if rdm identify is active
   bool isIdentifyOn() const;