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The ESP8266 is an exciting new WIFI device. It's suddenly become so popular because of an influx of cheap (£3) modules been made available on EBAY. So obviously you have been able to get USB WIFI devices for this price for a while but now they even have all the processing and even some GPIO on board so all you require to access them is a serial port and a few AT commands. This makes WIFI practical for any Arduino/PIC/uC application  that has at least one serial port which is a very lo ...