AT Command Handler

AT (About Modules) handles sending AT-style commands to a Serial device and receiving their responses, while not blocking (allowing other JavaScript to execute in the background).

For real-world usage, check out the ESP8266 and SIM900 modules.

You can use it as follows:

var at = require("AT").connect(Serial2);  

// Return some debug data, but also enable debug mode.
// Debug mode prints out what is sent and received

// As soon as the line buffer starts with `+IPD`, call a function
at.register("+IPD", function() {
  return "Text that should go in the line buffer now";  
// don't do it any more

// As soon as we get a complete line that begins with `Foo`, execute the function
at.registerLine("Foo", function() { ... });
// Now don't listen

// Just write some data, don't wait for a response

// Send simple command with 1 second timeout
at.cmd("AT+EO\r\n", 1000, function(d) {
  if (d===undefined) ; // we timed out!
  // or d is now the result we got

// Send command that returns multiple items
at.cmd("AT+FOO\r\n", 1000, function cb(d) {
  if (d===undefined) ; // we timed out!
  if (still_waiting_for_more_info) return cb;

// Are we waiting for the response to a command?
if (at.isBusy()) ...

// forward the next charCount characters received to the callback function
at.getData(charCount, callback)


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