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Hej Bo and others
I have no answer to what is wrong but some more info to those that know JMRI and perhaps Z21:

On the LocoNet you have a track occupancy that can be seen on LocoNet but not in JMRI ("INPUT_REP: address: 202 state: LO" - that is "B2 64 60 49" ).

Other messages, like feedback from a turnout ("SW_REP: address 201 state: closed", that is "B1 48 71 77") works well.

The track occupancy feedback seems to get stuck in the Z21 and not seen by JMRI,
? or it is transformed to a format not accepted by JMRI ( but then it should be seen on the JMRI log - or? ).

There is no problem with that type of occupancy detector when the LocoNet is connected directly to JMRI though an interface like the Bluetooth interface or LocoBuffer USB.
In that case and with the JMRI "Monitor LocoNet", the log for "INPUT_REP: address: 202 state: LO" looks like:
? "[B2 64 60 49]? Sensor L2S202 () is Low.? (BDL16 # 13, DS10; DS54/DS64/SE8c # 26, SwiA/S1/DS02)"

One thing comes to my mind.
Is the examples that you have, a turnout with address 201 and a track occupancy with address 202, correct?
If so you probably have both turnouts and track occupancy using the same addresses 200-204?
That works normally on a stand alone LocoNet, but can Z21 handle it when transforming it to what ever format that is used between Z21 and JMRI?

Bo, have you tried to connect JMRI directly to LocoNet through e.g. the Bluetooth interface and if so, can JMRI then see all the messages?

mvh/anders