The Xexun TK102 is a GPS device that can send coordinates over TCP to a server via GPRS. This Node.js script creates a TCP server that listens for GPRMC data, parse it and send the data to your post-process function. The parsed data is provided in a clean easy to use object, so you can easily store it in a database or push to a websocket server, for example.

Assuming your simcard has enough SMS and data credits and the TK102 is configured for your provider's APN, simply send adminip123456 IP PORT where obviously IP is the server's IP, PORT is the port to listen on and 123456 is your admin password. :) It cannot take hostnames as it has no dns features on board.

Activate sending coordinates: t030s003n123456

This tells the device to send its location AFTER each 30 seconds and no more than 3 times. 30 seconds is the minimum. Send t030s***n123456 to go on for infinity.

• s can also be m or h
• To end tracking send notn123456

The most easy way is to install from the npm registry. This is always the most recent stable version.

npm install tk102

Or you can install from the sourcecode on Github for the most recent changes, but this may be untested.

npm install git+https://github.com/fvdm/nodejs-tk102

var server = require('tk102')

// start server
server.createServer({
        port: 1337
})

// incoming data
server.on( 'track', function( gps ) {
        console.log( gps )
})

server.createServer({
        ip:             '1.2.3.4',  // default 0.0.0.0 (all ips)
        port:           0,          // default 0 = random, see 'listening' event
        connections:    10,         // simultaneous connections
        timeout:        10          // idle timeout in seconds
})

The server emits the following events about the server status and incoming GPS pushes.

The GPRMC push from the device.

server.on( 'track', function( gps ) {
        { raw: '1203301642,0031698765432,GPRMC,144219.000,A,5213.0327,N,00516.7759,E,0.63,179.59,300312,,,A*6D,F,imei:123456789012345,123',
          datetime: '2012-03-30 16:42',
          phone: '0031698765432',
          gps: { date: '2012-03-30', time: '14:42:19.000', signal: 'full', fix: 'active' },
          geo: { latitude: 52.130326, longitude: 5.167759, bearing: 179 },
          speed: { knots: 0.63, kmh: 1.167, mph: 0.725 },
          imei: '123456789012345' }
})

• raw: the input string without trailing whitespace
• datetime: the device 24h clock
• phone: the admin phonenumber that initiated this tracking
• gps:
  • date: date as received from satellites
  • time: time in 24h UTC as received from satellites
  • signal: GPS signal strength, either full or low
  • fix: GPS fix, either active or invalid
• geo:
  • latitude: position latitude
  • longitude: position longitude
  • bearing: direction in degrees
• speed:
  • knots: speed in knots per hour
  • kmh: speed in kilometer per hour
  • mph: speed in miles per hour
• imei: device IMEI

The raw unprocessed inbound data.

server.on( 'data', function( raw ) {
        console.log( 'Incoming data: '+ raw )
})

Very useful to find out random port (0).

server.on( 'listening', function( listen ) {
        { port: 56751, family: 2, address: '0.0.0.0' }
})

Emitted when a connection is established with the server, includes the socket.

server.on( 'connection', function( socket ) {
        console.log( 'Connection from '+ socket.remoteAddress )
})

Emitted when a connection expires.

server.on( 'timeout', function( socket ) {
        console.log( 'Time-out from '+ socket.remoteAddress )
})

Emitted when data cannot be parsed. Useful for debugging device issues.

Error is an instanceof Error with .stack trace.

server.on( 'fail', function( err ) {
	console.log( err )
})

Emitted when a server related error occured.

Error is an instanceof Error with .stack trace.

Server error               Catch server failures
Socket error               Catch communication failures
IP or port not available   This catches EADDRNOTAVAIL errors

server.on( 'error', function( err ) {
	console.log( err )
})

I'm not sure how this works with TK102-2 and other similar devices, I wrote this strictly for the TK102 as I only have one of those. There is no security built in, anyone could push GPRMC data to your server.

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