Domoticz

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-- collect begin- and endtimes of some astro events. dzVents >= 2.4.19 (domoticz V4.10717)
local scriptVar = 'astro dzVents'

return {
        on =    {
                    timer = { 'at 00:03', 'at 06:03' }, -- twice a day to be sure and 3 min past the hour because at the hour already quite busy 
                    httpResponses = { scriptVar }
                },

     logging =  {
                    level   = domoticz.LOG_ERROR,
                    marker  = scriptVar
                },

    execute = function(dz, item)
        -- domoticz text devices. Comment lines for devices you don't have / want
        local devKeys = {   -- Device names                  -- Key  in data
                            ['Civil Twilight End']          = 'civil_twilight_end',
                            ['Civil Twilight Start']        = 'civil_twilight_begin',
                            ['Nautical Twilight End']       = 'nautical_twilight_begin',
                            ['Nautical Twilight Start']     = 'nautical_twilight_end',
                            ['Astronomical Twilight End']   = 'astronomical_twilight_begin',
                            ['Astronomical Twilight Start'] = 'astronomical_twilight_end',
                            ['Sunset']                      = 'sunset',
                            ['Sunrise']                     = 'sunrise',
                        } 

        local function TZOffset()  -- in seconds
            return os.difftime(os.time(), os.time(os.date('!*t'))) + (dz.time.isdst and 3600 or 0)
        end

        local function makeTime(str)
            local pattern = '(%d+)-(%d+)-(%d+)T(%d+):(%d+):(%d+)'
            local runyear, runmonth, runday, runhour, runminute, runseconds = str:match(pattern)
            local timestamp = os.time({year = runyear, month = runmonth, day = runday, hour = runhour, min = runminute, sec = runseconds})
            return (os.date('%X',timestamp + TZOffset())):sub(1,5)
        end    

        local function getAstroData()
            url = 'https://api.sunrise-sunset.org/json' ..
                            '?lat=' .. dz.settings.location.latitude ..
                            '&lng=' .. dz.settings.location.longitude ..
                            '&formatted=0'
                dz.openURL({ url = url, callback = scriptVar })
        end

        local function procesResults(t)
            for dv, field in pairs(devKeys) do
                if dz.devices(dv) and t[field] then
                    dz.devices(dv).updateText(makeTime(t[field]))
                end
            end
        end

        if item.isHTTPResponse then
            if item.ok then 
                procesResults(item.json.results)
            else
                dz.log('problem retrieving information from sunrise-sunset.org \n' .. item.data, dz.LOG_ERROR)
            end
        else
            getAstroData()
        end
    end
}

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dz.utils.dumpTable(dz.settings)

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execute = function(dz, item)

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local dayLengthInMinutes = dz.time.sunsetInMinutes - dz.time.sunriseInMinutes