Finally - cheap WiFi?

@DrAzzy Thank you for the suggestions. I tried both but it still doesn't work. The code i used was

Serial2.setup(9600, { rx: B6, tx : B7 });
var wifi = require("ESP8266WiFi").connect(Serial1, function(err) {
  if (err) throw err;
  wifi.reset(function(err) {
    if (err) throw err;
    console.log("Connecting to WiFi");
    wifi.connect("WiFi_Name","WPA2_Key", function(err) {
      if (err) throw err;
      console.log("Connected");
      // Now you can do something, like an HTTP request
      require("http").get("http://www.pur3.co.uk/hello.txt", function(res) {
        console.log("Response: ",res);
        res.on('data', function(d) {
          console.log("--->"+d);
        });
      });
    });
  });
});

and to be sure I swaps the pins to

Serial2.setup(9600, { rx: B7, tx : B6 });

But I still get an error that reads

echo(0);
ERROR: Pin B7 is not capable of USART RX
Suitable pins are:
A3
=undefined

Ok, it's because you're using Serial2, not Serial1. You did change it in the .connect call though.

Try:

Serial1.setup(9600, { rx: B6, tx : B7 });
//^^^^ this one
var wifi = require("ESP8266WiFi").connect(Serial1, function(err) {
...