From WiFiEsp  2.2.2 (2017-11-03)
https://github.com/bportaluri/WiFiEsp
Also on Library Menager 

Work only on Serial
Not Serial1, 2, 3
Return wrong lochal IP, always return 0.0.0.0

Changed on RingBuffer.cpp & RingBuffer.h & EspDrv.cpp & EspDrv.h & Scketh
	RingBuff Class on RingBuffW

Added on EspDrv.cpp
	#include <stdarg.h>

Changed on EspDrv.cpp
	vsnprintf_P (cmdBuf, CMD_BUFFER_SIZE, (char*)cmd, args);
with
	vsnprintf (cmdBuf, CMD_BUFFER_SIZE, (char*)cmd, args);
	
	