[Reactor] Assignment to alarm ignored -- expression-driven global cannot be set by assignment

[LibraSun]

You can take not-terribly-human-readable blobs like that over to a JSON Pretty Print website (such as https://jsonformatter.org/json-pretty-print), paste it in and hit the "Outline" button, to see how the data looks in its underlying structure.
This allows you to quickly pinpoint the blob.key.subkey.data item you need to pull from in MSR.

Traversing the tree from upper-left to lower-right, I see the first instance of "forcecast" lives inside an overall object {} (I'm naming response), then the first item (i.e. element 0) of an array [] within data, then inside another array within another key called data, then a key called intensity, and finally the key you want, forecast, yielding:
response.data[0].data[0].intensity.forecast

[akbooer]

Remember that openLuup’s Test Lua window, gives you the pretty() function to do the same...

local x  = luup.devices[2]
print(pretty(x))

Gives:

{
  category_num = 0,
  description = "    openLuup",
  device_num_parent = 0,
  device_type = "openLuup",
  embedded = false,
  hidden = false,
  id = "",
  invisible = false,
  ip = "",
  mac = "",
  pass = "",
  room_num = 0,
  subcategory_num = 0,
  udn = "uuid:0058c0cb-c730-209a-50ab-6c88b470a8fd",
  user = ""
}

[cw-kid]

@librasun

They don't make it easy to work all this out do they.

"cointensity" is the name of my expression within the rule that first stores all the data pulled down from the HTTP request etc.

So for my in-line substitution I have tried this, which doesn't work.

${{ cointensity.response.data(0).data(0).intensity.forecast }}

I also tried:

${{ cointensity.data(0).data(0).intensity.forecast }}

and a few other variations as well.

I want to pass the "forecast" data to a Global Expression called "currentcarbonintensity"

[LibraSun]

I misled you a bit. MSR uses lexpjs, which references array elements in square brackets [] not the parentheses I first wrote (I'll edit my response, above).

Go with cointensity.data[0].data[0].intensity.forecast

[LibraSun]

(Also, I prefer to simply create another variable and set its value to cointensity.data[0].data[0].intensity.forecast and then reference THAT variable in my ${{ }} substitution. Why? Because this gives MSR a chance to tell me exactly where my expression is going wrong.)

If you follow this scheme in your workflow, you can entirely avoid having to use [Set Variable] so often, since the dependent variables will all "set themselves" immediately.

For example, a change to response will automatically update the values in any variable(s) defined by response.stuff or response.stuff.still.more.stuff (caveat: as long as those variables appear below response in your list of Expressions!).

[cw-kid]

@librasun

Thanks its working now.

These are the Global Expressions and its pulling in the correct data now.

[cw-kid]

Think I need a Vera plugin Dev.

I've tried to create a modified GenericIO device with four variables but its not working.

My MSR rule is sending out the data to each variable in Vera OK

But I can't seem to get that data to display on the front of the device in the web GUI.

Also for the Home Remote dashboard app, I'd need the generic sensor device and its data fully exposing to the SDATA stream. As Home Remote uses that for integration in to Vera etc.

So close, but I don't think I'm going to be able to properly create these types of devices in Vera myself.

EDIT:

Got it working now, I was using the wrong ServiceID in my MSR rule to set the variables.

Now I just need to figure out how to get this data in to the Vera SDATA output stream for Home Remote to see.

This is all I am seeing in SDATA currently:

 { "name": "Covid-19 Stats", "altid": "", "id": 703, "category": 0, "subcategory": -1, "room": 8, "parent": 0, "configured": "0", "light": "4325315" },

"light" is showing "4325315" which is the Confirmed number of Covid Cases, so that's a start, I need the other variables exposing to the SDATA stream some how.

EDIT2: I've added more <stateVariable> sections in to the S_GenericSensor2.xml file and now I can see all four variables data in the SDATA output stream, so I should now be able to add this device in to Home Remote and see all the data.

{ "name": "Covid-19 Stats", "altid": "", "id": 703, "category": 0, "subcategory": -1, "room": 8, "parent": 0, "variable2": "3768434", "variable3": "630", "variable4": "126515", "variable1": "4325315", "configured": "0" }

EDIT3: I now have a tile on a dashboard page in the Home Remote app.

So as a proof of concept this works.

Just need an easier way to create these virtual devices in Vera.

Someone on the Vera forum suggested taking a look at the MultiString plugin.

[LibraSun]

It's moments like this that I'm grateful for online Forums where the open exchange of ideas and experience works to everyone's advantage, without fear of reprisal from those "in charge".

[cw-kid]

Just testing some different online API's see what's possible.

If your in the UK the National Grid have a Carbon Intensity online API here. This is for my region / area.

The data also breaks down by percent the types of generation used, Wind, Solar, Nuclear, Coal etc but not added that as yet.

Vera:

Home Remote:

Need to play about with the tiles and add an icon and reposition some items yet.

[cw-kid]

I've tried the Vera Multi-String plugin, it looks just like the type of plugin I was needing and looking for.

You can have up to five variables on a device.

You can then have your rule in MSR send the data to each variable etc.

The Multi-String plugin devices data is also outputted in the Vera SDATA stream so these device will also work with the Home Remote dashboard app.

{ "name": "Covid-19 Stats", "altid": "", "id": 133, "category": 0, "subcategory": -1, "room": 0, "parent": 0, "variablename1": "Confirmed", "variable1": "4329180", "variablename2": "Recovered", "variable2": "3787312", "variablename3": "Critical", "variable3": "615", "variablename4": "Deaths", "variable4": "126573", "variablename5": "", "variable5": "", "options": "", "configured": "0" },

So I recommend using the Multi-String plugin rather than trying to create your own modified Generic IO devices as I was doing.

[LibraSun]

This post is deleted!

[LibraSun]

@cw-kid if one wanted to set all 5 parameter values at the same time, using an HTTP call to Vera, could that be done? (If so, I'd need to see a working example of a GET Request that does this.) Or would I have to issue 5 distinct calls to set those variables?

P.S. I see from this old post that I'm not the first one to wonder.

[akbooer]

It’s so trivial to make a custom request handler in Luup... really it’s one of its best feature. So, in this case, indeed, “roll your own” and simply set the required variables per the content of the request.

[cw-kid]

@librasun

I am doing a different http request to Vera to set each variable not one request that set them all.

[LibraSun]

@cw-kid said in Replacing SiteSensor Plugin (Vera) with MSR:

@librasun

I am doing a different http request to Vera to set each variable not one request that set them all.

Yeah, something tells me setting more than one at a time isn't possible, anyway. Just thought I'd ask the pros. Thanks!

[gwp1]

@librasun Reviving this a bit because this right here is where I think I'm failing spectacularly.

I'm working with the Ambient API for my weather station via Site Sensor in Vera. This thread has been fantastic at guiding me toward migrating the Site Sensor into MSR. Here's where I'm falling down:

The GET returns expected results. However, I believe I've messed up in creating the expressions for temp, wind speed, wind gust, and solar radiation.

I've entered response[1].lastData.tempf into the ambient_temp field and it returns Last value:(error) Invalid reference to member 1 of null. This is taken right from the Site Sensor recipe where it's working wonderfully so I know I'm probably close. I know the expression logic in MSR is slightly different than that of the Vera Reactor plugin - combined with my almost total befuddlement of proper expressions go isn't helping

Appreciate any guidance!

[Elcid]

should that be response[0].lastData.tempinf

[gwp1]

I thought the same but, after editing, it returned the same error just with ...member 0 of null instead.

[gwp1]

@elcid For full transparency, here's how the ruleset is configured (and it's pulling in expected results:

It's only the latter half that's making me stumble.

[Elcid]

so to set temp expression should be ambient_api[0].lastData.tempinf