Fronius inverter JSON integration

[Erwin van der Zwart]

Code:

-- Load libs
require('socket.http')
require('json')

-- Set timeout
socket.http.TIMEOUT = 15

-- Get data from API
--data = socket.http.request('http://192.168.1.182/solar_api/v1/GetInverterRealtimeData.cgi?scope=System&collection=CommonInverterData')
--data = socket.http.request('http://192.168.1.182/solar_api/v1/GetInverterRealtimeData.cgi?scope=System&collection=CumulationInverterData')
--data = socket.http.request('http://192.168.1.182/solar_api/v1/GetInverterRealtimeData.cgi?scope=System&collection=3PInverterData')
data = socket.http.request('http://192.168.1.182/solar_api/v1/GetInverterRealtimeData.cgi?scope=System')

if data then
  function sum(t)
    local sum = 0
    for k,v in pairs(t) do
        sum = sum + v
    end
    sum = math.round(sum*0.001,2)
    return sum
    end
  decdata = json.pdecode(data)
  totaldata = decdata.Body.Data.TOTAL_ENERGY.Values
  yeardata = decdata.Body.Data.YEAR_ENERGY.Values
  daydata = decdata.Body.Data.DAY_ENERGY.Values
  currentdata = decdata.Body.Data.PAC.Values
  total = sum(totaldata)
  year = sum(yeardata)
  day = sum(daydata)
  current = sum(currentdata)
  previoustotal = storage.get('froniustotal')
  if previoustotal then
    if total > previoustotal then
      grp.checkupdate('32/1/5',total)
        previoustotal = storage.set('froniustotal', total)
    end
  else
    storage.set('froniustotal', total)
  end
  grp.checkupdate('32/1/6',year)
  grp.checkupdate('32/1/7',day)
  grp.checkupdate('32/1/8',current)
end

I use the storage to check the previous total, as the inverter can go in sleep mode when there is no sun, the API is not sending a valid value at that moment and i dont want to write a invalid value to my trend. So this part is needed if you might see strange values when removing it (: