Unfortunately I have a problem maybe you will resolve it.

For example :
If I write in setup()
RemoteXY_Init ();

and in loop()
RemoteXY_Handler ();
  RemoteXY.onlineGraph_1_var1 = random() / 100000;

it works
but if I write
Serial1.readString() just after  RemoteXY_Handler ();  in the loop it does not work..Why? I precise that serial1 is used for the wifi chip.

In fact it is a problem in my case because in my own board I have a multiplexer chip to choose between the serial port coming from GPS module and serial port coming from Wifi chip but it seems not to be possible to switch... if it is in a seperate port of course it works... I hope it will be possible to swich between my modules...