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====== Station Supervisor ======

Station Supervisor is a [[https://github.com/MLAB-project/station-supervisor|bundle of tools and scripts]] for remote control of station and supervising of station health.
These tools run on the station side. There are also html page for displaying station health and last measured data. This webpage should be used for remote commands as well (for instance force kill or restart some process or reboot the station).
The measurement station are different in types (for instance radio detection station, video detection station, weather station).

===== System description =====

==== Hardware recovery unit ====

station-supervisor daemon running on station computer should use external support device for error outputs.
Connection management will be self controlled in device. Interface
between hardware recovery unit and main station computer should be
terminal based.  The terminal functionality should be provided by
station-supervisor monitor software (if it is running, otherwise by
standard system console) in system console mode station
supervisor-should write debug output on this device (similarly to dmesg
for example)

Technically the link between main computer and hardware recovery unit is implemented on RS232 serial interface.

==== Web monitoring interface ====

Web access is primary diagnostic interface. Terminal is secondary as
backup.

Moreover web access is intended as file based. File based means that
station-supervisor uploads an diagnostic file to webserver. Webserver
takes this file (probably from more than one station) and serve a web
page with stations status information. User interface in this case is
limited only to modification of an station-supervisor configuration file stored
on webserver. Configuration file may contain an parameter for station reboot
request. After station-supervisor will notice change or update in the
webserver stored configuration file, station-supervisor reboots the station and
update its parameters according to actual config file.

This approach is needed, because we usually have not direct IP
connectivity from Internet to stations.

===== Information Outputs =====

==== Error outputs ====

=== List of possible error outputs ===

* Remote data storage server in inaccessible 
  * Data storage capacity on station is near to limit. 
  * Some detectors are out of operation
  * Time synchronization disfunction

==== Service outputs ====

Service outputs should be displayed on station screen or serial (RS232 console). Displayig application (ssmon) should use minimal terminal graphics.

=== List of basic service outputs ===

* Time synchonisation quality measurement (NTPd and GPSd outputs)
  * System load
  * System temperatures

===== Service interface =====

Service interface software should modify some station parameters by download configuration files from data server.

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