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VD Bluespray Irrigation Controller



Hi everyone,


I'm having some issues with Lua code in a virtual device I am writing.

I'm getting information on the status of my Bluespray irrigation controller.

It has a basic API and reports if any of the zones are on watering. I want to just query the unit and then print out if any are detected as on.


When I query bluespray controller and its not watering anything I get some JSON back which looks like this.


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When its IS watering I get the following.


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To make it even more complex sometimes the system reports multiple zones operating. (This is normal and ok. I just need to pick up the first zone reported)


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My issue is detecting if I get none, one or multiple active zones. If I have a valid zone then I then want to put the first zone number into the zoneterminal variable. If I don't have a valid zone I just want to put 0 into the zoneterminal variable.

The problem is when I try something like the code below I get

[ERROR] 22:11:22: line 56: attempt to index field '?' (a nil value)


I cant figure out how to deal with LUA arrays correctly. (specifically detecting valid entries)

The json.null operator does not seem to work the same way on array values.


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Any help appreciated.

ps Code for the output is really extra long. Looking to understand how I can manipulate the variable name / number I am outputting to reduce the number of if statements.


Once I get this figured out I plan to also add in buttons to perform manual runs.





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  • I think I fixed issues with variable detection.

    If anyone cares here is the vd


    Will try and figure out buttons to turn the unit on in the future.

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