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9.1) HTTP Based Device Communication Servers (using the "gprmc" servlet)

[Skills required: Java, Servlets, HTTP based protocols]

HTTP-based communication is typically the easiest to implement. If your remote tracking device sends messages to the

server using an HTTP-base communication protocol, then the example server 'gprmc' can be modified to parse

received data and insert it into the SQL database. The sources for the 'gprmc' server (named after the $GPRMC record

in the NMEA-0183 protocol) can be found in the OpenGTS source directory "src/org/opengts/war/gprmc" and

runs as a Servlet in a servlet container such as Apache Tomcat (and uses the same access ports configured for

Tomcat).

9.1.1) Configuring the "gprmc" Servlet:

This module has many built-in configurable options and may only need special customization properties which can be

specified in the "webapp.conf" file. The following is a list of configurable properties available for the "gprmc" http-

based device communication server:

Data format/value Property Keys:

– gprmc.logName

Logging output name.

Default value: gprmc

– gprmc.uniquePrefix

UniqueID prefix, used when lookup up Device.

Defaults value: (same as "gprmc.logName" property value)

– gprmc.defaultAccountID

Default account ID.

Default value: gprmc

– gprmc.minimumSpeedKPH

Minimum acceptable speed (speeds less than this value will be set to '0')

Default value: 0.0

– gprmc.estimateOdometer

If true, a GPS based odometer will be calculated.

Default value: false

– gprmc.simulateGeozones

If true, a geozone arrival/departures will be detected, and the appropriate additional events will be created.

Default value: false

– gprmc.dateFormat

Date format for 'date' parameter.

Valid values: NONE, EPOCH, YMD, DMY, MDY

Default value: YMD

– gprmc.response.ok

Response returned to device on on successful data receipt.

Default value: (nothing returned)

– gprmc.response.error

Response on returned to device on on unsuccessful (error) data receipt.

Default value: (nothing returned)

OpenGTS Configuration and Installation Manual Page 32 of 60

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Sanav GC-101 Installationshandbuch Seite 32