Appendix)
A) Troubleshooting eLoc GL100 Device Connection Issues
The following are fequently-asked-questions regarding commonly occurring connection issues.
Q: I've configured an eLoc GL100 device to send data to the server, but have not received any data.
A: Monitor the "eloc.og" file for possible incoming connections from the device. If there is no indication that the
server is receiving any communication from the remote device, the most common reasons to check include:
• Make sure device has a valid/active SIM card.
• Make sure the device has been programmed with the proper APN ("Access Point Name") configuration as
specified by your wireless service provider.
• Make sure the device has been programmed with the proper host and port of your server.
• Make sure the server firewall allows incoming UDP/TCP connections on the specified port. If the server itself
provides its own firewall, then check the firewall settings. On Linux, this is usually controlled by "iptables".
The command to display the current iptables configuration is "iptables-save" (must be run as "root").
See "http://www.faqs.org/docs/iptables/iptables-save.html" for more information.
Q: I see data arriving for my device in the "eloc.log" file, but it is always the same event that is being sent over
and over.
A: If this occurs for all configured/connected eLoc GL100 devices, the problem is likely that returned UDP
acknowledgments are not being returned properly to the device (if the device is configured to require
acknowledgments). The most likely reason for this is that your computer responds to more than one IP address,
and the returned UDP packets are being sent from a different IP address than the one that the device is configured
to send data to. This can be fixed by setting the "bindAddress" attribute in the "dcservers.xml" file in the GTS
installation directory (then restart the eLoc GL100 DCS). In some cases, the SIM card wireless service provider
does not allow returned UDP packets to be sent from the server back to a device. In this case, it may be necessary
to program the eLoc GL100 devices to not require a return acknowledgment.
A: If this occurs for only one device (ie. other devices are reporting as expected), this this is likely due to the GPS
receiver's inability to obtain a new GPS fix, and the previous GPS fix is being resent. This usually means that the
device is simply in an area where the GPS satellites cannot be seen (ie. Indoors, etc). On rare occasions, this can
mean that the GPS antenna has become unplugged, or has been damaged.
Q: The received events have a valid latitude/longitude, but do not have an odometer value.
A: The eLoc GL100 DCS property "estimateOdometer" allows enabling a calculated odometer value, based on
the distance traveled between successive GPS points. To enable a calculated estimated odometer value, make
sure this property is set to "true".
GTS Enterprise Installation/Configuration Guide Page 11 of 11
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