The aim of this project was to monitor a group of RTI XP-3 control processors by sending them some text string and expecting same string back.
I observed that if the XP-3 is hung for some reason it can answer ICMP ping but does not reply to that UDP request.
If the XP-3 has not replied for some time I ask managed power outlet to bounce the power for it. The daemon sending emails in some cases.
All configurtion, addresses of XP-3, addresses of power outlets (NetPing here) workng states and monitoring data stored in memory pandas dataframe and I do not need it persist between daemon restart. Currently I don't need this data to be acquired by others application and monitoring systems. Daemon writes the log file and it might be useful for track events and actions.
Related files:
/usr/local/sbin/rti-watchdog-daemon.py- the daemon itself/var/run/rti-watchdog/rti-watchdog-daemon.pid- PID file created by systemd/etc/systemd/system/rti-watchdog.service- systemd service for automatic startup of the daemon/var/log/rti-watchdog/- folder where the daemon keeps its logs, has owners 'nobody:nogroup' in my case. Log rotation is done by python logger module and daemon itself, not system logrotate.