Domoticz

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local BATTERY_THRESHOLD = 10

return {
	active = true,
	on = {
		['timer'] = 'every hour'
	},
	execute = function(domoticz)

		local message

		-- first filter on low battery level
		local lowOnBat = domoticz.devices.filter(function(device)

			local level = device.batteryLevel
			return (level ~= nil and -- not all devices have this attribute
					level ~= 255 and -- probably means something like 'not applicable'
					level <= BATTERY_THRESHOLD)

		end)

		-- then loop over the results
		lowOnBat.forEach(function(lowDevice)

			message = message .. 'Device ' ..
					lowDevice.name .. ' is low on batteries (' .. lowDevice.batteryLevel .. '), '

		end)

		if (message) then
			domoticz.notify('Low battery warning', message, domoticz.PRIORITY_NORMAL)
			domoticz.log('Low battery warning: ' .. message, domoticz.LOG_ERROR)
		end
	end
}

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if Message ~= '' then
	commandArray['SendEmail']='Domoticz Battery Levels#'.. Message .. '#' .. EmailTo
end

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    handle = io.popen("curl 'http://" .. Domoticz .. ":" .. DomoticzPort .. "/json.htm?type=devices&order=name'")
    devicesJson = handle:read('*all')
    handle:close()
    devices = json:decode(devicesJson)
    BattToReplace = false
    for i,device in ipairs(devices.result) do
            if device.BatteryLevel < BatteryThreshold and device.Used == 1 then
            Message = Message .. device.Name .. ' battery level is ' .. device.BatteryLevel .. '%<br>'
            print(device.Name .. ' battery level is ' .. device.BatteryLevel .. '%')
        end
    end