standardize logging

[iot-root]

things to log:

• when something is turned on/off
• errors

[ammaratef45]

More considerations:

• start a new log file every (hour?)
• keep only (3?) older files
• send the log files to the API before deleting them

[iot-root]

There is a /usr/bin/logger currently used. Might be a good way to go.

see sudo crontab -u root -l

* * * * * /usr/local/etc/cronjob_tasks.sh 2>&1 | /usr/bin/logger -t GRD-CRN-SYS