Lua snippet for parsing latest temperature for DIY Cloud Weather Station with ESP32/ESP8266 https://randomnerdtutorials.com/cloud-weather-station-esp32-esp8266/ for neutrino hd receiver

parser.lua

-- Author Ezak (Marc Szymkowiak)
-- 2021
-- LICENSE MIT

function init()
    --config
    windowTitle = "Temperature"
    url = "http://replace_url_to_weather_station.com/"
    
    -- global vars
    rowIndex = 0;
    roomIndex = 0  
    temperatureIndex = 0;
    roomTable = {};
    temperatureTable = {};
    n = neutrino();
  end
  
  function readFile(_File)
      local fp, s
      fp = io.open(_File, "r")
      if fp == nil then 
          error("Error opening file '" .. _File .. "'.");
      end
          s = fp:read("*a");
          fp:close();
          return s;
  end

  function downloadHtml()
    -- download html file to parse data from
    filename = "/tmp/temperature.txt"
    os.execute("wget -q -O " .. filename .. " '" .. url .. "'" );
  end
  
  function parseTemperature()
    local htmlFile = "/tmp/temperature.txt"
    -- read html code from file
    local htmlSourceCode = readFile(htmlFile);
    -- search for table with temperature readings
    local tableReadings = htmlSourceCode:match("<table.*id=\"tableReadings\">(.*)</table>");
    -- read table with temperatures
      for row in string.gmatch(tableReadings, "<tr>(.-)</tr>") do
        -- read table header (room name)
        if (rowIndex == 0) then
          for room in string.gmatch(row, "<th>(.-)</th>") do
            -- rowIndex 0 is datename and no room
            if (roomIndex > 0) then
              roomTable[roomIndex] = room
            end
            roomIndex = roomIndex + 1
          end
        end
        -- read latest temperature for all rooms
        if (rowIndex == 1) then
          for temperature in string.gmatch(row, "<td>(.-)</td>") do
            -- read datetime
            if (temperatureIndex == 0) then
              datetime = temperature
            else
            -- read latest temperature
              temperatureTable[temperatureIndex] = temperature
            end
            temperatureIndex = temperatureIndex + 1
          end
        end
        rowIndex = rowIndex + 1
      end
  end

  function neutrinoExec()
    -- show  window until exit key is pressed
	repeat
		msg, data = n:GetInput(500)
	until msg == RC['home'] or msg == RC['setup'];
   end

   function getRoomString()
    roomString = ""
    for index, room in pairs(roomTable) do
        roomString = roomString .. room .. "\t" .. "\t" .. "\t" .. "\t";
    end
    return roomString
   end

   function getTemperatureString()
    temperatureString = ""
    for index, temperature in pairs(temperatureTable) do
        temperatureString = temperatureString .. temperature .. " ºC" .. "\t" .. "\t";
    end
    return temperatureString
   end

  function showWindow()
    local roomsRow = getRoomString();
    local temperatureRow = getTemperatureString();
    local spacer = 8;
    local x  = 500;
    local y  = 150;
    local dx = 800;
    local dy = 300;
    local fh_title = n:FontHeight(FONT['MENU_TITLE']);
    
    -- create and show window
    local window = cwindow.new{x=x, y=y, dx=dx, dy=dy, title=windowTitle};
    window:paint();
    
    local x1  = x + spacer;
    local y1  = y + window:headerHeight() + spacer;
    local dx1 = dx - spacer*2;
    local dy1 = fh_title;
    
    -- create rooms table (rooms)
    roomCT = ctext.new{x=x1, y=y1, dx=dx1, dy=dy1, text=roomsRow, 
                mode="ALIGN_AUTO_WIDTH | ALIGN_AUTO_HIGH | ALIGN_TOP | ALIGN_CENTER",
                font_text=FONT['MENU']};
    roomCT:paint();

    -- next line
    y1 = y1 + fh_title + spacer*2;
    
    -- create temperature table (temperatures)
    temperatureCT = ctext.new{x=x1, y=y1, dx=dx1, dy=dy1, text=temperatureRow, 
                mode="ALIGN_AUTO_WIDTH | ALIGN_AUTO_HIGH | ALIGN_TOP | ALIGN_CENTER ",
                font_text=FONT['MENU']};
                temperatureCT:paint();

    neutrinoExec();

    roomCT:hide();
    temperatureCT:hide();
    window:hide();    

  end
  
  function main()
    init()
    downloadHtml()
    parseTemperature()
    showWindow()
  end
  
  -- main
  main()