Node-bluetooth-serial-port writing lag test case. Writing consistently takes 250ms to complete on OSX.

bluetoothLagTest

"use strict";

var bluetooth=require('bluetooth-serial-port');
bluetooth=new bluetooth.BluetoothSerialPort();

var write=function()
{
    var timeStamp;
    console.log("sending...");
    timeStamp=Date.now();
    bluetooth.write(
        new Buffer("some data","utf-8"),
        function(err,bytesWritten)
        {
            console.log("sent.");
            console.log("lag time: "+(Date.now()-timeStamp));
            write();
        }
    );
};

var fail=function()
{
    console.log('cannot connect');
}

bluetooth.on(
    'found',
    function(address,name)
    {
        bluetooth.findSerialPortChannel(
            address,
            function(channel)
            {
                bluetooth.connect(
                    address,
                    channel,
                    write,
                    fail
                );
            }
        );
    }
);

bluetooth.inquire();