Testing the WebThings API with Espruino

webthings-test.js

const i2c = new I2C();
i2c.setup({sda:B9,scl:B8});
const bme = require("BME680").connectI2C(i2c);
const wifi = require("Wifi");
const thing = {
  temperature: 0,
  humidity: 0,
  gas: 0,
  pressure: 0,
  description: {
    "@context": "https://iot.mozilla.org/schemas/",
    "@type": ["TemperatureSensor"],
    "id": url,
    "title": "Environment",
    "description": "Sense the weather",
    "properties": {
      "temperature": {
        "@type": "TemperatureProperty",
        "type": "integer",
        "unit": "degree fahrenheit",
        "title": "Temperature",
        "description": "Current temperature",
        "links": [{"href": "/things/weather/properties/temperature"}]
      },
      "humidity": {
        "@type": "LevelProperty",
        "type": "integer",
        "unit": "percent",
        "readOnly": true,
        "title": "Humidity",
        "description": "Current humidity",
        "links": [{"href": "/things/weather/properties/humidity"}]
      },
      "gas": {
        "type": "integer",
        "readOnly": true,
        "title": "Gas (ohms)",
        "description": "Current gas resistance",
        "links": [{"href": "/things/weather/properties/gas"}]
      },
      "pressure": {
        "type": "integer",
        "readOnly": true,
        "title": "Pressure (hPa)",
        "description": "Current pressure",
        "links": [{"href": "/things/weather/properties/pressure"}]
      }
    }
  }
};

function success(res, obj) {
  res.writeHead(200, {'Content-Type': 'application/json'});
  res.end(JSON.stringify(obj));
}

function router(req, res) {
  if (req.url === '/things/weather') {
    return success(res, thing.description);
  }
  if (req.url === '/things/weather/properties/temperature') {
    return success(res, {temperature: thing.temperature});
  }
  if (req.url === '/things/weather/properties/humidity') {
    return success(res, {humidity: thing.humidity});
  }
  if (req.url === '/things/weather/properties/gas') {
    return success(res, {gas: thing.gas});
  }
  if (req.url === '/things/weather/properties/pressure') {
    return success(res, {pressure: thing.pressure});
  }
}

function createServer(ip){
  thing.id = 'http://' + ip + '/things/weather';
  require("http").createServer(router).listen(80);
  console.log('Serving at ' + thing.id);
}

setInterval(() => {
  const x = bme.get_sensor_data();
  thing.temperature = ((x.temperature * (9.0 / 5.0)) + 32.0) | 0;
  thing.humidity = (x.humidity) | 0;
  thing.gas = (x.gas_resistance) | 0;
  thing.pressure = (x.pressure) | 0;
  bme.perform_measurement();
}, 1000);

console.log('Connecting...');
wifi.stopAP();
wifi.connect('ssid', {'password':'password'}, () => {
  wifi.getIP((err, x) => {
    if (err !== null) {
      console.log(err);
    } else {
      createServer(x.ip);
    }
  });
});