WIP - Puck.js reading CSC (cycling speed cadence) BLE sensor to replace bike computer head unit with Puck.js or (later) Pixl.js

As a quick follow up, this works!

var last_wheel_event_time = 0, actual_wheel_event_time;
var last_cumulative_wheel_revolutions = 0, cumulative_wheel_revolutions;
var delta_revolutions, delta_event_time;
var wheel_circumference = 2340;
var delta_time_in_ms;


function OnNotify(event) {
    //console.log("-> "+(event.target.value.getUint8(0, true)>>> 0).toString(2)); //characteristics flags
    cumulative_wheel_revolutions = event.target.value.getUint32(1, true);
    actual_wheel_event_time = event.target.value.getUint16(5, true);
    console.log("Cumulative wheel Revolutions: "+ cumulative_wheel_revolutions);
    console.log("Last Wheel Event time: "+ actual_wheel_event_time + " ms");
    delta_revolutions = cumulative_wheel_revolutions - last_cumulative_wheel_revolutions;
    //console.log("-> "+event.target.value.getUint16(7, true)); //crank
    //console.log("-> "+event.target.value.getUint16(9, true)); //crank
  
  	if (actual_wheel_event_time >= last_wheel_event_time) {
				delta_event_time = actual_wheel_event_time - last_wheel_event_time;
		} else {
				delta_event_time = 65536 - last_wheel_event_time + actual_wheel_event_time;
			}
    delta_time_in_ms =(delta_event_time / 1.024);
  console.log(delta_event_time);
    console.log("delta_time_in_ms:" + delta_time_in_ms);
  last_wheel_event_time = actual_wheel_event_time; last_cumulative_wheel_revolutions = cumulative_wheel_revolutions;
}

var gatt;
NRF.requestDevice({ timeout:20000, filters: [{ namePrefix: 'Wahoo' }] }).then(function(device) {
  console.log(device);
  return device.gatt.connect();
}).then(function(g) {
  gatt = g;
  return gatt.getPrimaryService("1816");
}).then(function(service) {
  //console.log("Service:" + service);
  return service.getCharacteristic("0x2A5B");
}).then(function(characteristic) {
  characteristic.on('characteristicvaluech­anged', OnNotify);
  return characteristic.startNotifications();
}).then(function() {
  console.log("Done!");
  // Then call gatt.disconnect(); if/when you want to disconnect
});

Thanks a lot, J