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$ sudo apt-get install python2.7 python2.7-dev supervisor stunnel4 ntp $ sudo pip install configobj pyzmq protobuf pyserial |
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The pyzmq Python package requires a compiler and the Python development package (headers and library) to build a Python extension. |
Serial devices
The AP Bridge software interacts with the I/O of the AP Mote through serial devices: The Serial API port of the AP Mote is used for general communication between the AP Bridge and the AP Mote, and another I/O is used to reset the AP mote. In the Include Page
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The update-apc-config.py script can also be used to perform manual configuration of the AP Bridge instances as described in the Include Page
Startup and shutdown
In the reference software distribution for the Raspberry Pi, the AP Bridge is managed by the supervisor process controller.
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In the unix_http_server section, update to:
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[unix_http_server] file=/var/run/supervisor_server.sock chmod=0660 chown=dust:dust |
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Refer to the commands section of the Include Page
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- The AP Bridge binaries are installed in APC_HOME/bin.
- The AP Bridge software reads its configuration from APC_HOME/conf. The AP Bridge process(es) are managed by configuration files stored in APC_HOME/etc/supervisor.conf.d.
- The AP Bridge generates log files toto APC_HOME/logs. Log files are automatically rotated when they reach a certain size.
- The AP Bridge writes certain runtime information to APC_HOME/var/run.
Network connectivity
If the system is being built with APs physically separated from the VManager system, then the simplest implementation is to connect all the devices to the same Ethernet network. Any method that provides a reliable TCP/IP connection between the APs and VManager can be used including WiFi, or cellular. The network connectivity must be consistent and reliable so that the APs can communicate constantly with the VManager. The VManager will consider an AP to be lost if its connectivity is interrupted for 30 seconds. In the event that an AP is lost, the VManager will immediately reassign all mote paths through the remaining APs and motes that are only connected through the lost AP may be lost as well. If the AP returns later on, then the VManager will slowly re-integrate the AP into the network topology through normal optimization cycles.
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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
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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$ 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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- NTP
- GPSd