Calculating time for use in cron entry, and installing via SSH

Tutorials & Examples Solutions
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#1

In this example, the Astro binding is used with the suggested linked items that are used in this rule. The Exec binding is also used to SSH to a remote machine. This example assume you have already exchanged and installed SSH keys.

rule "Update Chicken Schedule" 
// Chicken egg production decreases in Winter, so to keep production up, lighting is 
// installed in the pen.
// The pen door needs to be closed at night for protection from predators.
// Since the chicken house data link is unreliable, actions are sent to the remote cron
// job handler.  In the event of connection loss, the schedule continues in place.
when 
    Time is noon
then 
    var doorOpenCron =  new DateTime(LocalSun_Daylight_StartTime.state.toString).getMinuteOfHour.toString + "@@" +
                        new DateTime(LocalSun_Daylight_StartTime.state.toString).getHourOfDay.toString + "@@" +
                        "\'*\'@@\'*\'@@\'*\'@@/usr/local/bin/doorOpen\n"
    var doorCloseCron = new DateTime(LocalSun_AstroDusk_EndTime.state.toString).getMinuteOfHour.toString + "@@" +
                        new DateTime(LocalSun_AstroDusk_EndTime.state.toString).getHourOfDay.toString + "@@" +
                        "\'*\'@@\'*\'@@\'*\'@@/usr/local/bin/doorClose\n"
    var lightOnCron =   new DateTime(LocalSun_Daylight_EndTime.state.toString).getMinuteOfHour.toString + "@@" +
                        new DateTime(LocalSun_Daylight_EndTime.state.toString).getHourOfDay.toString + "@@" +
                        "\'*\'@@\'*\'@@\'*\'@@/usr/local/bin/lightOn\n"
    val DateTime offTime = new DateTime((LocalSun_Daylight_StartTime.state as DateTimeType).zonedDateTime.toInstant().toEpochMilli).plusHours(20)
    var lightOffCron =  new DateTime(offTime.toString).getMinuteOfHour.toString + "@@" +
                        new DateTime(offTime.toString).getHourOfDay.toString + "@@" +
                        "\'*\'@@\'*\'@@\'*\'@@/usr/local/bin/lightOff\n"
    var allCron = doorOpenCron
                + doorCloseCron
                + lightOnCron
                + lightOffCron
    var cmd = "ssh@@pi@henhousepi.local@@echo@@\'" + allCron + "\'@@|@@crontab@@-"
    logInfo("Logger","Chicken cron is " + cmd )
    val results = executeCommandLine(cmd, 5000)
    logInfo("Logger", results)
end
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