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Part 6 – AT Commands for GPS-Enabled Devices Chapter 16 – AT Commands for GPS-Enabled Devices
Universal IP AT Commands Reference Guide (Document S000457K) 96
GPS Message Syntax
GPS message syntax that is sent from the UIP device to the backend server:
<GPSPREFIX><GPSURAIS><NMEA_MESSAGE><CR><LF>
Where
<GPSPREFIX> is the unique prefix. Length is 0 to 4 characters (Character format or requirements
usually provided by backend service)
<GPSURAIS> is the unique remote asset identification string. Length is 0 to 20 characters (This
string may be provided by the backend service)
<NMEA_MESSAGE> is a standard NMEA sentence received from the internal GPS receiver
<CR><LF> is a Carriage Return and a Line feed
The message that will be transmitted can be viewed with the #GPSGETMESSAGE command. The
difference from the viewed message and the transmitted message will be the NMEA message parameters
due to timestamp changes and or location changes.
The <GPSPREFIX><GPSURAIS><NMEA_MESSAGE><CR><LF> is a popular format used by numerous
services. Along with the format, the following rules are followed:
Typical transmission protocol is UDP (format provided by backend service) due to low overhead, however
TCP is available
Multiple GPS message can and will be transmitted granted the specific message type is enabled
(GPSGPVTG, GPSGPRMC, etc)
Typical minimum message type needed by the backend services is usually the GPRMC or GPGGA and
GPVTG messages (Requirement provided by the backend server)
Do not use the $ character in either the <GPSPREFIX> or <GPSURAIS> sections
Typical transmission intervals to the backend service are 5sec and greater (Requirement provided by
backend server)
GPS Message Examples
The following examples use a <GPSPREFIX> configured to && and a <GPSURAIS> configured with
ID1111
&&ID1111$GPGSA,A,3,07,09,11,20,28,31,,,,,,,3.0,2.2,2.1*36<CR><LF>
&&ID1111$GPGSV,3,1,09,04,40,193,41,07,79,354,50,08,02,171,00,09,28,305,31*78<CR><LF>
&&ID1111$GPGSV,3,2,09,11,15,048,45,20,21,078,37,24,08,205,27,28,55,122,46*77<CR><LF>
&&ID1111$GPGSV,3,3,09,31,67,052,43*43<CR><LF>
&&ID1111$GPGGA,223750.00,4502.2467,N,09302.4844,W,1,05,5.4,287.0,M,-27.6,M,,*58<CR><LF>
&&ID1111$GPRMC,223750.00,A,4502.2467,N,09302.4844,W,57.00,97.29,131104,2.5,E,A*20<CR><LF>