Low battery alerts

[akbooer]

Moved from https://smarthome.community/topic/56/disable-vera-zwave-device-polling-at-the-device-level where you'll find the referenced code.

[CatmanV2]

@rafale77 Can this be modified to send an alarm on low battery? This is something that I've been looking at since the OpenLuup migration.

Something like

for k, v in pairs(luup.devices) do
  local bat =  luup.variable_get("urn:micasaverde-com:serviceId:HaDevice1", "BatteryLevel",k)
   if var bat <= 20 then
     $do your alert thing here
   end
end

Cheers

Sure that won't work as it is, but am I on the right track?

C

[akbooer]

Right track, but crossing lanes, a bit. Three things not quite right:

• battery level variable may not exist
• even if it does, it's returned as a string
• you have a spurious 'var' that's been left in from the code you modelled this on

So...

for k, v in pairs(luup.devices) do
  local bat = luup.variable_get("urn:micasaverde-com:serviceId:HaDevice1", "BatteryLevel",k)
   if bat and tonumber(bat) <= 20 then
     -- do your alert thing here
   end
end

[rafale77]

yup @akbooer is right. I do something like this to send a TTS about my iPhone going low on battery while I am at home.

[therealdb]

My routine to check for battery. I usually do it on first day of month, but if you pass currentday to the function, you'll get a complete report.
Just omit the parameter and it will notify you of low battery devices only. I usually run it a couple of times per day, unless it's the first day of month, of course

function checkBatteries(forceDay)
	local threshold = 20
	local counter = 0
	local deviceNames = "Low battery devices"

	-- override se primo del mese per report completo
	local currentTime = os.date("*t")

	if tonumber(currentTime.day) == tonumber(forceDay or 1) then
		threshold = 100
		deviceNames = "Montly battery check"
	end

	for deviceNo, d in pairs(luup.devices) do
		local value = getVar(D_HA, "BatteryLevel", deviceNo)
		if value ~= nil and value ~= "" and tonumber(value) <= threshold then
			counter = counter + 1
			local deviceName = (d ~= nil) and d.description or string.format("Device #%s", tostring(deviceNo))

			deviceNames = string.format("%s\n - %s: %s%s", deviceNames, deviceName, tostring(value), "%")
		end
	end

	if counter > 0 then
		sendAlert(string.format("%s %s", emoji.batteries, deviceNames), nil, true)
	end
end

[CatmanV2]

Thanks, gents!

C

[CatmanV2]

Is there any way of 'actively' to notify when the battery level goes below a given value, without creating a low batter alert for every device? I guess just running this code above every hour or so would be close enough.

C

[rafale77]

@CatmanV2

Depending on how frequently you want to check but... I have gone as far as creating a variable watch on the battery for that particular "k" device.

Add something like this in your startup lua:

luup.variable_watch("checkbat", "urn:micasaverde-com:serviceId:HaDevice1", "BatteryLevel",k)

and in that case I would use the function "checkbat" as follow

function checkbat()
local bat = luup.variable_get("urn:micasaverde-com:serviceId:HaDevice1", "BatteryLevel",k)
if bat and tonumber(bat) <= 20 then
   -- do your alert thing here
end
end

[akbooer]

That’s normally done with a simple scene trigger...?

[rafale77]

yeah it can be done through a scene as well but if I have a bunch of them, I just create the watches in a batch in my startup lua. Seems faster than using scenes.