restored original condition for serialCanRX in handleSerial()

Author: rommo911

wled00/wled.cpp

@@ -454,7 +454,7 @@ void WLED::setup()
 
   // all GPIOs are allocated at this point
 #ifdef ARDUINO_USB_CDC_ON_BOOT
-  // USB CDC means USB D+ D- are used .. pin allocator will always return. force it as enabled instead
+  // USB CDC means USB D+ D- are used .. pin allocator will always return false in this case. force it as enabled instead
   serialCanRX = true;
   serialCanTX = true;
 #else 

wled00/wled_serial.cpp

@@ -69,11 +69,7 @@ void sendBytes(){
 
 void handleSerial()
 {
-  #if ARDUINO_USB_CDC_ON_BOOT
-    if (!Serial) return;// arduino docs: `if (Serial)` indicates whether or not the USB CDC serial connection is open. For all non-USB CDC ports, this will always return true
-  #else
-    if (!(serialCanRX)) return; // check via pin manager if UART pin is NOT allocated by other function.
-  #endif 
+  if (!(serialCanRX && Serial)) return; // arduino docs: `if (Serial)` indicates whether or not the USB CDC serial connection is open. For all non-USB CDC ports, this will always return true
 
   static auto state = AdaState::Header_A;
   static uint16_t count = 0;