Rule for devices battery level ?

[cw-kid]

Hi

Wanted to create a rule for monitoring the battery level of Z-Wave devices on my Vera hub.

I can select the battery level as the trigger OK.

But not sure how to handle the Reaction to send an alert / notification ?

If in the triggers I have multiple devices monitored for their battery level

How could I create say a TTS announcement or text alert that mentions the name of the device who's battery level has dropped below 10% ? The device that has triggered the rule.

I'd rather not have to create an individual rule for each device etc.

Any ideas?

Thanks

[toggledbits]

@cw-kid One of my to-do list tasks for expressions is to be able to create a list of devices that match a test. Until that comes, you can just build your own array of battery-operated devices like this (lets call this battery_device_list) :

Then, you can reduce that list to all of the devices that have battery < 10%:

That leaves you with an array of the entities that have low battery. Use another expression to convert that into a comma-separated list of entity names:

Your rule just checks to see if that battery_low_names (a string now) expression is not empty, and runs whatever notifications you want to run if it is not. You can include the battery_low_names variable in the text of your email or other notification, too.

[cw-kid]

@toggledbits

Thanks for the detailed reply. I will try and follow your suggestions.

So would these expressions be Global ones? Or ones within the rule?

Also as you don't natively support Telegram messenger I am not sure how I could insert the name of the device in to a HTTP request.

[cw-kid]

Its working I think, I set up the expressions as Global ones.

And my rules trigger is Expression value > battery_low_names > is NOT Null

As a test I have used the MSR internal Alert in the rules reaction

But I don't think I can insert ${{ battery_low_names }} in to a HTTP request for either Telegram messenger or TTS to Google Home speaker via Node-Red etc.

[Ian]

@cw-kid

This works for me - having previously set up the accounts at CallMeBot.

The Request URL is: http://api.callmebot.com/text.php?source=web&user=@username&text=${{message}}

It just sends a text that is the content of message.

[cw-kid]

@ian

Ian many thanks that is actually working for both of my HTTP requests.

So now the Google Home Speakers says "Check Battery Level of X device name" and the Telegram text message also works stating the same.

Cheers

[cw-kid]

I seem to have a problem with my trigger however

Its triggering the reaction when I don't want it to do so.

I need to make the value of the expression "battery_low_names" null when no devices are below the battery level of 10% etc.

I've tried adding in a ? in to the expression but it doesn't seem to be working

join( each id in battery_low_list: getEntity(id)?.name, ', ')

EDIT:

This seems to work instead adding "? id: null" to the end of the expression.

join( each id in battery_low_list: getEntity(id).name, ', ') ? id: null

EDIT 2:

Maybe it doesn't work because now its not putting in the devices name in the expression value

EDIT 3:

I then tried changing the trigger altogether to this, but it doesn't work and becomes true anyway.

Likewise with this one:

Maybe there is a bug? All of these are going true and running the reaction when I expect them not to do that

[Ian]

@cw-kid

I'm using this.

This goes true when battery_low_names is populated with the names of the devices with low battery levels.

[cw-kid]

@ian

That works !

Easy when you know how..

The trigger is now going false when no devices are in the battery_low_names expression results.

[toggledbits]

@toggledbits said in Rule for devices battery level ?:

(a string now) expression is not empty,

Details.

Also these can be rule expressions, they do not need to be global.

[cw-kid]

Thanks I've changed the expressions to local rule ones instead and its all still working.

[cw-kid]

How can I make this rule re-trigger ?

Say I don't immediate go replace the battery on the device mentioned, can I have the rule run the alerts / notifications each day or week until I have done it and changed the batteries ?

Also can the alerts also state what the battery level percentage actually is ?

Thanks

[toggledbits]

@cw-kid said in Rule for devices battery level ?:

How can I make this rule re-trigger ?

Wrap the condition in a group and put the group in "pulse" output mode with the timing you want.

@cw-kid said in Rule for devices battery level ?:

Also can the alerts also state what the battery level percentage actually is ?

Yes, but I'm going to leave it as an exercise for the reader. Level of difficulty: moderate.

[Ian]

@cw-kid

Try this.

[cw-kid]

@ian

Thanks Ian that works, my Telegram text message now has the number% at the end of the message now.

However this messes up the Google Home TTS announcement sent via node-red, if I have a "%" in the expression. So I had to change it to the word "percent" instead and now the TTS sounds correct when spoken.

join( each id in battery_low_list: getEntity(id).name + " " + "at" + " " + int(getEntity(id).attributes.battery_power.level * 100) + " percent", ', ')

[cw-kid]

@toggledbits said in Rule for devices battery level ?:

Wrap the condition in a group and put the group in "pulse" output mode with the timing you want.

Like this?

Seems to be working and the alerts are repeating every 60 seconds now. I will just set this to 24hrs I think.