Hi winbackgo,

when a client subscribes to an item, it may request the initial snapshot, which is the means through which the current item state is received with no need to wait for the asynchronous real time updates.
Snapshots are supported by MERGE, DISTINCT and COMMAND mode, but not by RAW mode.

I'm sorry but it's not clear to me whether initial snapshot matches with your "initial data" need.

Could you please expand on your use cases? Could you please give us more detailed requirements?

Thanks
Gianluca