Fix 4.0.0

[Apollon77]

• multipart processing now works
• serialport error gone
  Ready for 4.0.1

[Apollon77]

The delay is now on 10s by default because 5s were too low in some test situations. In fact a user can set the delay to 0 to achieve the behaviour like before (e.g. when someone wants to have the single messages and want to assemble itself)