cerner-lights-protocol.js

// The lighting controller expects a JSON-formatted array of lights states in the following format:

[
  {
    "lightId": Number,
    "state": Boolean
  }
];

// Sample usage: Turning on lights 1, 2 and 3. Turning off light 4.

[
  {
    "lightId": 1,
    "state": true
  },
  {
    "lightId": 2,
    "state": true
  },
  {
    "lightId": 3,
    "state": true
  },
  {
    "lightId": 4,
    "state": false
  }
];


// Note: Any lights not specifically addressed in the message will not change state.
// If light 7 was on before the message above was sent, it will still be on afterwards.

// Example Server Implementation

const app = require('http').createServer();
const io = require('socket.io')(app);

app.listen(8000);

io.on('connection', function(socket) {
  // Send random light data every second
  setInterval(() => {
    let lightData = [];
    for (let i = 0; i < 14; i++) {
      lightData.push({
        lightId: i,
        state: Math.random() > 0.5 ? true : false
      });
    }
    socket.emit('message', lightData);
  }, 1000);
});