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When I call zway_cc_user_code_get() it returns 0, but does nothing. With debugging turned on I see no messages at all (i.e., no notification of a send command being queued up or anything).

Can you share DH content of your UserCode CC (part of log with all DH set is ok) and show how you invoke it?

Hmm... My apologies but I don't understand the terminology (I'm not very fluent with the zWave terminology). What do you mean by "DH"? I did a search through some log files and the string "DH" doesn't show up anywhere. Also, to be clear, when I submit the zway_cc_user_code_get() request, *nothing* appears in the log.

The call is made thusly:
zway_cc_user_code_get(zway, node_id, instance_id, user_id, NULL, NULL, NULL);

For what it's worth, I've read that the device being queried does not support retrieval of the user codes, so I didn't really expect this to work, but the zway library reports the device as supporting CC 99, so... Either way, if zway is just choosing to ignore my request, I would have expected a failure return code.

Excuse, DH is Z-Way specific - DataHolder - a value in the Z-Way data tree. Call it "variable" So we need to have a look on zway.devices[NN].UserCode.data tree.

If nothing happens in the log, first check what it returns (may be it is != NoError ?)

It returns 0, and nothing appears in the debug log.

Please issue in your browser /JS/Run/zway.devices[NN].UserCode.data (change NN to Id)

This info is correct. Sure there are no logs when you execute this command? Can you show your code?