Tunnel – Sending GPS positions in real time to server using TCP socket or HTTP

Scenario details:

• Some port facilities dispose of vehicles that lack being equipped with a real-ime GPS locating system
• Being a real-time system it does not need to save GPS locations history to the internal datalogger of the device in order to be sent when it later (as it is done in a conventional fleet control system),but these GPS locations should be sent as soon as possible to a sentral server, every second, if possible
• GPS locations should be sent in JSON format to the central server, and the transmission method should be chosen between TCP Socket (the quickest method with the minimal rate of 1-2 seconds) or through HTTP (it is a bit slower). The IP address for transmission via socket is 200.1.2.3 and the port is TCP 20010

Solution: MTX-Tunnel firmware + MTX-Java-IoT/MTX-Java-T/MTX-Java-T2

EXAMPLE of configuration (config.txt file) for the indicated scenario. Solution for quick communication via Socket TCP:

Configuration

Observations

COMM2_baudrate: 9600 COMM2_bitsperchar: 8 COMM2_autocts: off COMM2_autorts: off COMM2_stopbits: 1 COMM2_parity: none GPRS_apn: movistar.es GPRS_login: MOVISTAR GPRS_password: MOVISTAR GPRS_timeout: 0 GPS_mode: socket GPS_period: 2 GPS_ip: 200.1.2.3 GPS_port: 20010 MTX_mode: none MTX_pin: 0000 MTX_model: MTX-4G-JAVA-IOT-STD-N-GPS MTX_atLimited: off MTX_numGSMErrors: 180 MTX_ping: 30 MTX_pingIP: 8.8.8.8 SMS_allPhones: on SMS_sendIP: on SMS_ATEnabled: on SMS_ATResponse: on FIREWALL_enabled: off TELNET_enabled: on TELNET_login: user TELNET_password: 1234 TELNET_port: 20023

Serial port baud rate 8 bit data No flow control No flow control 1 stop bit No parity APN GPRS provided by the GSM operator GPRS Login GPRS Password Permanent 3G session Sending location vía SOCKET TCP Attempt to send GPS location every 2 sconds IP address receiving GPS locations TCP port where GPS location is sent We will not use TCP serial port gateways The SIM card PIN (if there is any) MTX modem model being used No limits for AT commands N. of GSM errors to reset Ping every 30 minutes without comms IP address to ping Commands SMS sent from any mobile phone The modem will send IP to a missed call or SMS It is possible to send commands to MTX via SMS SMS replies to sent AT commands Any incoming connection form any IP is allowed Telnet is activated Telnet login Telnet password Port chosen for Telnet

Details:

• MTX modem, having connected to a 3G network, will connect to the IP address 200.1.2.3 and the port TCP 20010
• GPS location will be sent via sending a JSON object. Here is an example of JONSON transmission:

{“IMEI”:”358884051192529”,”TYPE”:”GPS”,”DATE”:”2016/11/04”,”TIME”:”20:44:35”,“LAT”:”41.62963”,”NS”:”N”,”LON”:”2.3609116”,”EW”:”E”,”ALT”:”185.7”,”SPE”:”0.25”,“COU”:”0.00”,”TA”:”3”,”HPO”:”1.90”,”VDO”:”1.44”,”SAT”:”4”}

Where:

IMEI	the unique identification number of the modem
TYPE	JSON type (GPS in this case)
DATE	UTC date returned via GPS
TIME	UTC time returned via GPS
LAT	GPS Latitude
NS	N=North, S=South
LON	GPS Longitude
EW	E=East , W=West
ALT	Altitude (meters)
SPE	Speed (km/h)
COU	Coure
STA	Status. 0=no Fix, 2=2D, 3=3D
HPO	Horizontal accuracy indication. The lower the better
VDO	Vertical accuracy indication. The lower the better
SAT	satellite Nº

EXAMPLE of configuration (config.txt file) for the scenario. Solution for quick communication via HTTP:

Configuration

Observations

COMM2_baudrate: 9600 COMM2_bitsperchar: 8 COMM2_autorts: off COMM2_autorts: off COMM2_stopbits: 1 COMM2_parity: none GPRS_apn: movistar.es GPRS_login: MOVISTAR GPRS_password: MOVISTAR GPRS_timeout: 0 GPS_mode: logger GPS_period: 30 LOGGER_enabled: on LOGGER_httpMode: getjson LOGGER_password: 12345678 LOGGER_server: www.myServer.com/page.asp?data= LOGGER_registerSize: 500 LOGGER_numRegistersRam: 2 LOGGER_numRegistersFlash: 0 MTX_mode: none MTX_pin: 0000 MTX_model: MTX-4G-JAVA-IOT-STD-N-GPS MTX_atLimited: off MTX_numGSMErrors: 180 MTX_ping: 30 MTX_pingIP: 8.8.8.8 MTX_TPServer: es.pool.ntp.org MTX_TPServer2: 2.europe.pool.ntp.org MTX_TPProtocol: ntp SMS_allPhones: on SMS_sendIP: on SMS_ATEnabled: on SMS_ATResponse: on FIREWALL_enabled: off TELNET_enabled: on TELNET_login: user TELNET_password: 1234 TELNET_port: 20023

Serial port (where internal GPS is connected) rate Number of bits No flow control No flow control 1 stop bit No parity APN GPRS provided by the GSM operator GPRS Login GPRS Password Permanent 3G session Sending location via logger (HTTP) Attempt to send GPS location every 30 sconds Logger activated to store GPS locations JSON sent via HTTP GET JSON user’s field Web platform address where Son is sent Size of the record Only RAM memory (real time) Only RAM memory real time We will not use TCP serial gateways The SIM card PIN (if there is any) MTX modem model being used No limits for AT commands N. GSM errors to reset Ping every 30 minutes without comms IP address to ping Time server (MTX has to synchronized the time) Backup time server NTP protocol used SMS with commands can be sent from any cell Modem will reply with its IP to a missed call/SMS It is possible to send commands to MTX via SMS SMS replies to sent AT commands Any incoming connection form any IP is allowed Telnet is activated Telnet login Telnet password Port chosen for Telnet

Details:

• Stores locations collected every 30 secs in LOGGER_ and sends it to an URL in LOGGER_server
• Not necessary to store locations. Recommended to set LOGGER_numRegistersFlash to “0”
• JSON format is exactly the same as shown in the previous method
• If the method GPS_mode is specified, fasthttp can reduce the value of GPS_period to 10 secs. Keep in mind that when applying this method, LOGGER_ will be only used for sending GPS positions via HTTP in real time, not for additional tasks like MODBUS registers readings, etc.