function on_msg_receive (msg)
  if started == 0 then
    return
  end
  if msg.out then
    return
  end
  --Damit der "Gelesen Haken" erscheint
  if msg.text then
    mark_read (msg.from.print_name, ok_cb, false)
  end

  --Ggf. nur eine Rufnummer zulassen:
  if msg.from.print_name ~= 'Fillip_iPhone' then
    os.execute("/home/pi/tg/send_script ".. msg.from.print_name .." 'Ungültige Nr.'")
    return
  end
  if (string.lower(msg.text) == 'uptime') then
    local handle = io.popen("sudo python /home/pi/tg/tg_actions.py uptime")
    local res = handle:read("*a")
    handle:close()
    os.execute("/home/pi/tg/send_script ".. msg.from.print_name .." '"..res.."' ")
    --Alternativ:
    --send_msg (msg.from.print_name, res)
    return
  elseif (string.lower(msg.text) == 'Standheizung') then
    local handle = io.popen("sudo python /home/pi/tg/tg_actions.py Standheizung")
    local res = handle:read("*a")
    os.execute("/home/pi/tg/send_script "..msg.from.print_name.." '"..res.."' ")
    handle:close()
    return
  elseif (string.lower(msg.text) == 'reboot') then
    local handle = io.popen("sudo python /home/pi/tg/tg_actions.py reboot")
    local res = handle:read("*a")
    handle:close()
    os.execute("/home/pi/tg/send_script ".. msg.from.print_name .." '"..res.."' ")
    return
  else
    os.execute("/home/pi/tg/send_script ".. msg.from.print_name .." 'Fehler' ")
  end