Timestamp no processed

[Trpplayer79]

Dear,
The timestamp is not parsed by the sketch, even with the latest library.
With the SerialPassthrough script did i grab attached example data from my Belgian smart meter.
DSMR example.txt

The code for reading date/time is:
// Format YYMMDDHHMMSS (example: 210314123511)
TIMESTAMP = data.timestamp;
// Put timestamp in readable format
TIME = TIMESTAMP.substring(6, 8) + ":" + TIMESTAMP.substring(8, 10) + ":" + TIMESTAMP.substring(10, 12)
+ " " +
TIMESTAMP.substring(4, 6) + "/" + TIMESTAMP.substring(2, 4);