Dragon farm when no players

function init()
  while true do
    rs.setOutput('back', rs.getInput('top'))
    if ( not rs.getInput('top') ) then
        local headers = {
            ['User-Agent'] = 'Mozilla/5.0 (Linux; Android 7.0; SM-G892A Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/60.0.3112.107 Mobile Safari/537.36'
        }
        local response = http.get('http://mcapi.xdefcon.com/server/ie.toastynetworks.net/players/text', headers)
        local currentPlayers = response.readAll()
        local responseCode = response.getResponseCode()
        if ( tonumber(currentPlayers) == 0 ) then
            rs.setOutput('back', true)
        else
            rs.setOutput('back', false)
        end
        response.close()
      end
    sleep(5)
  end
end

function safeString(text)
  local newText = {}
  for i = 1, #text do
      local val = text:byte(i)
      newText[i] = (val > 31 and val < 127) and val or 63
  end
  return string.char(unpack(newText))
end

init()