Scheduling rule for coffee maker with delay/timer (Beginner)

[Markus2020 (Markus)]

• Platform information:

  • Hardware: Raspberry Pi 3b+ Processor: BCM2835; Linux 4.19.50-v7+ armv7l
  • OS: Raspbian GNU/Linux 10 (buster); Firmware #896
  • Java Runtime Environment: (build 11.0.8+10-post-Raspbian-1deb10u1); Version 11.0.8" 2020-07-14
  • openHAB version: 2.5.9 Release Build

• Please post configurations (if applicable):

  • Items:
    
Switch Coffee_PowerOn “Kaffeemaschine Ein” { http=">[:POST:http://192.168.X.YY/proffer?param=1]" }
Switch Coffee_Rinse “Kaffeemaschine Spülen” { http=">[:POST:http://192.168.1.33/proffer?param=2]" }


• Issue of the topic: please be detailed explaining your issue:

Dear community,
After setting up my openHAB successfully on the above mentioned environment I am now getting in touch with my first rule:

The goal is to prepare my coffee machine in terms of power on and rinse action on a specific time in the morning with a delay of 2 minutes / 120 seconds between both actions.

1. Power on coffee maker every Monday and Wednesday at 04:45am
2. Wait 120 seconds
3. Start mandatory rinse action

Both actions are successfully covered with two switch items using the http-binding which are stated above.

One approach could be covering both actions in two rules, the second rule is just postponed 2 minutes in the cron minute time:

Rule "Kaffeemaschine power on"
when
              Time cron 0 45 4 ? * MON,WED *
then
Coffee_PowerOn.sendCommand(On)
end

Rule "Kaffeemaschine rinse"
when
              Time cron 0 47 4 ? * MON,WED *
then
              Coffee_Rinse.sendCommand(On)
end

Is my general understanding of the syntax correct? To have this task combined into one rule, my preferred approach would be the following:

Rule "Kaffeemaschine preparation"
when
              Time cron 0 45 4 ? * MON,WED *
then
              Coffee_PowerOn.sendCommand(On)
              createTimer(now.plusSeconds(120), [ Coffee_Rinse.sendCommand(On) ])
end

Same question here: Is my general understanding of the syntax correct? Right now I am not able to check the openHab logs/events for testing because the logging seems to be broken. I will create another thread for this issue.

Therefore this request to you is just to make sure that I heading into the right direction. Any approvals, advices and improvements are appreciated. Thanks!

Best regards,
Markus

PS: Sorry for the formatting
Edit: Code fencing

[Bruce_Osborne]

@Markus2020

:Sorry for the formatting

You need to use code fences for configuration to avoid the forum stripping out necessary spacing.

How to use code fences

We all have to type this content over and over and over. Here is a posting we can all point to when the topic comes up. Why use code fences? Because rules, sitemap, logs, and configs are all but unreadable when code fences are not used. When to use code fences? Whenever one is posting any sort of code, config, log, and any text where line wrapping, indentation, and using an equal spaced font makes the text more legible. How to use code fences? Use 3 backticks (```)... Or use <code>... …

[Markus2020 (Markus)]

@Bruce_Osborne

@Markus2020

:Sorry for the formatting

You need to use code fences for configuration to avoid the forum stripping out necessary spacing.

How to use code fences

Thanks for the hint, text and code passages are updated!

[Bruce_Osborne]

Your rules, where spaces matter, need code fences too.

[Markus2020 (Markus)]

I think I got it now

[Bruce_Osborne]

Thank you.

I may be wrong but I thought rules need 4 spaces for indents. I may be mistaken, though,

Running multiple commands in the same rule is fine. I do it in some of mine.

[Markus2020 (Markus)]

Great, thanks for looking into this. How about the general syntax for my prefered rule:

Rule "Kaffeemaschine preparation"
when
              Time cron 0 45 4 ? * MON,WED *
then
              Coffee_PowerOn.sendCommand(On)
              createTimer(now.plusSeconds(120), [ Coffee_Rinse.sendCommand(On) ])
end

Is the syntax for the timer correct in terms of brackets?

[Bruce_Osborne]

I have not used createTimer(). Sorry.

[Markus2020 (Markus)]

Sure, no problem. I added the rule to my openHAB environment with adding TUE for tomorrows test. I will let you know if can directly make coffee or not

Unfortunately I am not able to check the logs due to the issue with the logging mechanism from my other thread.

[5iver (Scott Rushworth)]

@Markus2020

Coffee_PowerOn.sendCommand(On)

Send ON… not On (case sensitive).

[Markus2020 (Markus)]

Thanks! Directly corrected in my rules file

[5iver (Scott Rushworth)]

Another thing… if you want to test this now, add a System started trigger and the rule will trigger when the file is saved. Remove it when you are done testing.

[Markus2020 (Markus)]

Thank you all for your comments. With your help I got it runnung with the System startedcondition.

2020-12-15 12:12:46.171 [INFO ] [el.core.internal.ModelRepositoryImpl] - Loading model 'ikea.rules'

2020-12-15 12:12:52.518 [ome.event.ItemCommandEvent] - Item 'Coffee_PowerOn' received command ON
2020-12-15 12:14:52.527 [ome.event.ItemCommandEvent] - Item 'Coffee_Rinse' received command ON

It worked perfectly with System started condition, therefore I exchanged it now with the required cron time expression. Is it correct to put the cron expression into <"">?

rule "Ikea"
when
    Time cron "0 45 4 ? * MON,WED *"
then
    Coffee_PowerOn.sendCommand(ON)
    createTimer(now.plusSeconds(120), [ Coffee_Rinse.sendCommand(ON) ])
end

According to the logs the rule was sucessfully loaded. Lets see if the coffee maker is ready tomorrow morning

[5iver (Scott Rushworth)]

@Markus2020

Is it correct to put the cron expression into <“”>?

Yes, quotes around Quartz cron expression…

https://www.openhab.org/v2.5/docs/configuration/rules-dsl.html#time-based-triggers