Domoticz

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------------------------------------------------------------------------------
--
--
-- Domoticz lua script to convert XML output from KMTronic DS1820 LAN module
-- Reads the temperature based on the unique ID of the sensor and passes it 
-- back to a virtual temperature sensor(s)
-- sensors in Domoticz
--
------------------------------------------------------------------------------
-- Rob Allen 12/04/2016
------------------------------------------------------------------------------

commandArray = {} 
 


function XML_Capture(cmd,flatten)
   local f = assert(io.popen(cmd, 'r'))
   local s = assert(f:read('*a'))
   f:close()
   if flatten  then 
      s = string.gsub(s, '^%s+', '')
      s = string.gsub(s, '%s+$', '')
      s = string.gsub(s, '[\n\r]+', ' ')
   end
   return s
end

--set to true to print to log file.
debug = false

--define the idx of your temperature sensors - i.e. what you have called your sensors and their IDX numbers 

HWTemp_Flow = 108
HWTemp_Return = 109
HWTemp_Tank_Top = 110
HWTemp_Tank_Bottom = 111

--define temperature sensor UID's - i.e. the DS1820 serial number 
--up to 4 per DS1820 LAN interface

sensorID_1 = "28006D2307000061"
sensorID_2 = "28AC0924070000C8"
sensorID_3 = "28FA1B24070000AB"
sensorID_4 = "28B30924070000B7"


-- Define your device IP@

Device_IP = "172.16.227.201"

if debug == true then
        print("Reading values from: 'http://"..Device_IP.."/status.xml'")
end

-- Read the XML data from the device 

XML_string=XML_Capture("curl -s 'http://"..Device_IP.."/status.xml'",1)

 
valid = string.find(XML_string, "<response>")    -- check we are looking in the right place

    if debug == true then
        print(XML_string)
    end
    
    if valid == nil then 
        print ("Bad XML status read - temperatures NOT updated")
    else
  
--Find the first sensor based on its UID
    
    i = string.find(XML_string,sensorID_1)          -- find the unique ID of the sensor
    p = string.find(XML_string,"<temp>",i)          --look for the next occurrence of <temp> after ID
   
    HWTemp_Flow_Temperature=string.sub(XML_string,p+6,p+10)  --temperature is the 5 characters after <temp> - i.e. 6-10 
     
    commandArray[1] = {['UpdateDevice'] = HWTemp_Flow.."|0|"..HWTemp_Flow_Temperature} --send updated values to Domoticz
       
        if debug == true then
            print("temp returned = ".."'"..HWTemp_Flow_Temperature.."'")
        end
       
        
        
-- Second sensor based on its UID      
      
    i = string.find(XML_string, sensorID_2)         -- find the next unique ID of the sensor
    p = string.find(XML_string,"<temp>",i)          --look for the next occurrence of <temp> after ID
    
    HWTemp_Return_Temperature=string.sub(XML_string,p+6,p+10) --temperature is the 5 characters after <temp> - i.e. 6-10
   
    commandArray[2] = { ['UpdateDevice'] = HWTemp_Return.."|0|"..HWTemp_Return_Temperature } --send updated values to Domoticz

        if debug == true then
            print("temp returned = ".."'"..HWTemp_Return_Temperature.."'")
        end
      
-- Third sensor based on its UID


    i = string.find(XML_string, sensorID_3)         -- find the next unique ID of the sensor
    p = string.find(XML_string,"<temp>",i)          --look for the next occurrence of <temp> after ID
   
    
    HWTemp_Tank_Top_Temperature=string.sub(XML_string,p+6,p+10) --temperature is the 5 characters after <temp> - i.e. 6-10
      
    commandArray[3] = {['UpdateDevice'] = HWTemp_Tank_Top.."|0|"..HWTemp_Tank_Top_Temperature } --send updated values to Domoticz

        if debug == true then
            print("temp returned = ".."'"..HWTemp_Tank_Top_Temperature.."'")
        end

        
-- Fourth sensor based on its UID

    i = string.find(XML_string, sensorID_4)         -- find the next unique ID of the sensor
    p = string.find(XML_string,"<temp>",i)          --look for the next occurrence of <temp> after ID
    
    HWTemp_Tank_Bottom_Temperature=string.sub(XML_string,p+6,p+10) --temperature is the 5 characters after <temp> - i.e. 6-10
    
    commandArray[4] = { ['UpdateDevice'] = HWTemp_Tank_Bottom.."|0|"..HWTemp_Tank_Bottom_Temperature } --send updated values to Domoticz

        if debug == true then
            print("temp returned = ".."'"..HWTemp_Tank_Bottom_Temperature.."'")
        end
      

    end  
     


  
return commandArray