Build a Real-time Location Tracker Using Wia

Demo: https://wiaio.github.io/wia-location-tracker-example-web/

Project Requirements

• Node.js and NPM must be installed. How to install Node.js on a Raspberry Pi: http://blog.wia.io/installing-node-js-on-a-raspberry-pi-3

• A Wia account. You can create one for free here: https://www.wia.io/signup

Setting up the Wia Node.js SDK

• First thing you will want to do is to create a folder on your location device. Let's call it wia-location-device.

• Go into the folder and initialize the project by creating a package.json file using the command “npm init” (use defaults for everything).

• Install the Wia SDK using the command “npm install --save wia“.

• Your package.json file should look something like the code below.

{
    "name": "wia-location-device",
    "version": "1.0.0",
    "description": "",
    "main": "index.js",
    "scripts": {
        "test": "echo \"Error: no test specified\" && exit 1"
    },
    "author": "Your Name Here",
    "license": "ISC",
    "dependencies": {
        "wia": "^1.3.3"
    }
}

Creating your Location Tracking Device

• Go to the Wia dashboard and select Devices.

• From here, click on the + symbol and the Add New Device modal will appear.

• Enter ‘Location Device' as the name and click Add Device.

• Take a note of the device's secret key, we'll need this later.

Write code for the location tracking device

• We need to create a file for our program, let's call it index.js

• Copy the code from the example below add to the index.js file.

• Replace the device-secret-key on line 3 with your device's secret key that you made a note of earlier.

• Now to test that you have done your setup correctly, simply run node index.js

• Your device should have updated in the dashboard under the Location tab, with your sensor readings. You can also view in in real-time in the Debugger tab.

'use strict'
var wia = require('wia')('Your secret key'); 
// collection of cities
var cities = [{"city":"Dublin","lat":"53.349805","lng":"-6.260310"}, 
             {"city":"London","lat":"51.5013673","lng":"-0.1440787"}, 
             {"city":"Paris","lat":"48.8922431","lng":"2.2380753"}, 
             {"city":"Toronto","lat":"43.6426731","lng":"-79.3928402"}]; 
// Using the MQTT stream
wia.stream.on('connect', function() { 
 console.log('Stream connected!'); 
 // randomly choosing city location to publish
 var random = Math.floor(Math.random() * 4); 
 var randomcity = cities[random]; 
 // setting the interval at which to publish location i.e. every second
 setInterval(function() { 
   // function to publish location data 
   wia.locations.publish( 
       { 
         "latitude": randomcity.lat, 
         "longitude": randomcity.lng, 
         "altitude": 2 

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