RFC 5544 help

[Riccardo Castegnaro]

Hello,
i successfully obtained a Timestamp from a TSP server (RFC 3161)

and i created the following Object:

TimeStampedData timeStampedData = new TimeStampedData(uri, null,
asn1OctetString, evid);

how can i save this structure to a file with RFC 5544 specifications?

Thank you