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In the event that the VManager system and AP Bridges are not synchronized, the SmartMesh IP network will continue to work normally, however mapping network time to UTC time accurately may be impossible.
GPS connectivity
A future version of the AP Bridge software will support The VManager 1.1 release provides support for using a GPS device for time keeping in the AP Bridge software. In the reference configuration for a GPS-enabled AP Bridge, the GPS device's PPS signal is used to feed both the AP Mote and the NTP software running on the AP Bridge device. The AP Bridge software uses GPSd to read the time from the GPS device and to track whether the GPS device is properly synchronized.
TODO: describe how GPSd is configured, AP Bridge parameters to connect to GPSd
TODO: describe special configuration of NTP to enable GPS inputs, special configuration of RPi kernel to enable PPS GPIO
Troubleshooting
TODO: migrate troubleshooting to a new page
Verifying device time synchronization
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| No Format |
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$ ntpdate -q pool.ntp.org ... 25 Mar 14:09:49 ntpdate[12569]: step time server 132.163.4.101 offset -26.481737 sec |
TODO: list the GPS verification steps
References
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