simple_pebble_watchface/src/js/pebble-js-app.js

var xhrRequest = function (url, type, callback) {

  var xhr = new XMLHttpRequest();

  xhr.onload = function () {
    callback(this.responseText);
  };

  xhr.open(type, url);
  xhr.send();

};


function locationSuccess(pos) {

  // generic API key, has to be replaced by developers one
  var api_key = 'ca82d3c964da82f54d033abf702a46a5';

  var lat = Math.round(pos.coords.latitude*10) / 10;
  var lon = Math.round(pos.coords.longitude*10) / 10;

  // Construct URL
  var url = 'http://api.openweathermap.org/data/2.5/weather?lat=' +
      lat + '&lon=' + lon + '&APPID=' + api_key;

  // Send request to OpenWeatherMap
  xhrRequest(url, 'GET',
    function(responseText) {
      // responseText contains a JSON object with weather info
      var json = JSON.parse(responseText);

      // Temperature in Kelvin requires adjustment
      var temperature = Math.round(json.main.temp - 273.15);
      console.log('Temperature is ' + temperature);

      // Conditions
      var conditions = json.weather[0].main;
      console.log('Conditions are ' + conditions);

      // Assemble dictionary using our keys
      var dictionary = {
        'KEY_TEMPERATURE': temperature,
        'KEY_CONDITIONS': conditions
      };

      // Send to Pebble
      Pebble.sendAppMessage(dictionary,
        function(e) {
          console.log('Weather info sent to Pebble successfully!');
        },
        function(e) {
          console.log('Error sending weather info to Pebble!');
        }
      );
    }
  );

}


function locationError(err) {

  console.log('Error requesting location!');

}


function getWeather() {

  navigator.geolocation.getCurrentPosition(
    locationSuccess,
    locationError,
    {timeout: 15000, maximumAge: 60000}
  );

}


function getHomeTemp() {

  var url = "https://raspi.goodcleanfun.de/cgi-bin/raspiweb.py?pwd=d3Vyc3RnZXNpY2h0&period=3";

  console.log('Try to get room temp');

  xhrRequest(url, 'POST',
    function(responseText) {
      // responseText contains a JSON object with weather info
      var json = JSON.parse(responseText);

      // Conditions
      var room_temp = (Math.round(json.room[0]*10) / 10) + '°C @ home';
      console.log('Room temp is ' + room_temp);

      // Assemble dictionary using our keys
      var dictionary = {
        'KEY_ROOM_TEMP': room_temp
      };

      // Send to Pebble
      Pebble.sendAppMessage(dictionary,
        function(e) {
          console.log('Room temp sent to Pebble successfully!');
        },
        function(e) {
          console.log('Error sending room temp to Pebble!');
        }
      );
    }
  );
}


// Listen for when the watchface is opened
Pebble.addEventListener('ready',
  function(e) {
    console.log('PebbleKit JS ready!');
    // Get the initial weather
    getWeather();
    getHomeTemp();
  }
);


// Listen for when an AppMessage is received
Pebble.addEventListener('appmessage',
  function(e) {
    console.log('AppMessage received!');
    getWeather();
    getHomeTemp();
  }
);