sonoff-lan-mode-test.js

const WebSocket = require('ws');
const ws        = new WebSocket('ws://192.168.8.122:8081', [ 'chat' ]);

const APIKEY = 'e6ef18d4-07a2-47e8-9443-34e66c83f2ee';
const seq    = () => String(Date.now());
let deviceId = null;

ws.on('open', function open(ev) {
  ws.send(JSON.stringify({
    "action":    "userOnline",
    "ts":        String(0 | Date.now / 1000),
    "version":   6,
    "apikey":    APIKEY,
    "sequence":  seq(),
    "userAgent": "app"
  }));
});

let first = true;
ws.on('message', function incoming(json) {
  const data = JSON.parse(json);
  console.log('response: %j', data);
  if (! first) return;
  first = false;
  ws.send(JSON.stringify({
    "action":   "update",
    "deviceid": data.deviceid,
    "apikey":   APIKEY,
    "params":   {
      "switches": [
        {
          "outlet": 0,
          "switch": "off"
        }
      ]
    },
    "sequence":  seq(),
    "userAgent": "app"
  }));
});