© 2018 Spireon, Inc.
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Supported
Remote Update
The JG-LSsupports OTA field upgrades of the JG-LSresident application. An over the
air TFTP (Trivial File Transfer Protocol) connection is made over a UDP/IP connection.
A replacement file is then transferred from a server to the JG-LSand that file replaces
the previous application image.
Power Modes
The JG-LS device supports several power modes that are set by AT commands. In full
power mode the GPS is active and the cellular subsystem will maintain a persistent
cellular connection whenever service is available. IP connection is maintained
according to the configuration of the device.
The device can be put in a sleep mode whenever it runs on an internal battery, if the
external battery is low or if the device is not moving. In low power mode the GPS is
not running and the LED’s are off. The device would return to full power whenever an
event occurs that triggers a report. Those events include:
•
GPIO change
•
Battery threshold
•
Heartbeat
•
Power-up
•
Accelerometer
•
Tamper
Any hardware or software reset will return the device to full power mode.
Report
The JG-LS captures data and forms a report record with that data. A report is a data
structure containing all of the sensory and other typically useful data on the device.
Reports are generated in response to specified events, such as periodic timeout,
speed threshold, geo-fence crossing, etc., or in response to a Report Now command.
Report Queuing
If a report trigger occurs while UDP connection is unavailable, it will be queued until
connection becomes available and transmitted at such time. The only way report(s)
can be lost is if too many reports are queued and the report-queue is overflowing. In
such case the earliest report(s) will be discarded. The size of the queue can be
configured via the Report Queue command.
Ack’ed Mode
UDP is not a 100% reliable connection and occasional reports or
command/responses may be lost. Since all commands have responses, the server
can repeat any command to which there is no response. In order to assure reliable
