save() with modules where .connect() initializes device (such as RFID reader MFRC522)

@allObjects I have been at the same point some days ago.
What I did is to connect GPIO2 to a serial port of an Espruino Board.
Espruino starts this application:

var d = "",epc = [];
Serial3.setup(115200,{rx:C11});
Serial3.on('data', function(data) {
  var i = 0;
  d += data;
  i = d.indexOf("\n");
  if(i > 0){
    if(d.substr(0,i).indexOf("epc1=") >= 0){
      epc.push(d.substr(0,i));
    }
    console.log(d.substr(0,i));
    d = d.substr(i+1);
  }
  if(d.length >= 128) {
    console.log(d);
    d = "";
  }
});

In my case Espruino is connected to a local copy of WebIDE and ESP8266 is connected to the original WebIDE.
Debugging need to be switched on with require("ESP8266").logDebug(true)