Wiki source code of ESP8266 second Serial port

Last modified by Victor Zhang on 17:03, 17/04/2020

	1.1	1	* Ref: [[https:~~/~~/github.com/esp8266/Arduino/issues/482>>url:https://github.com/esp8266/Arduino/issues/482]]
		2	* Summary, the serial1 only have send but can't be in "listen" mode for receiv