smart-pinhole-workshop/lib/broadcaster.js

A nodeschool workshop to learn how smart (iot) things work.

var dgram = require('dgram')

module.exports = function (exercise) {
  return function (er, cb) {
    if (!cb) {
      cb = er
      er = null
    }

    var sock = dgram.createSocket('udp4')
      , packet = new Buffer(JSON.stringify({
        workshop: exercise.workshopper.title,
        exercise: exercise.name,
        event: er ? 'fail' : 'pass',
        timestamp: Date.now()
      }))
      , port = process.env.PROGRESS_BROADCAST_PORT || 1138

    try {
      sock.bind(port, '0.0.0.0', function (er) {
        if (er) return;
        sock.setBroadcast(true)

        sock.send(packet, 0, packet.length, port, '255.255.255.255', function () {
          sock.close()
        })
      })
    } catch (er) {}

    cb(er)
  }
}