Web client not receiving any data?

[TonyRoberts]

As a first step, may you please check that you are not referring to a later jsdoc?
Note that "onStart" was introduced in Web Client Library quite recently (version 4.1 build 1261).

I'll check, but as far as I am aware I'm using the jsdoc for the actual version I'm using

About the snapshot, note that, indeed, any update event for an item (let's call it ITEM) sent by the Data Adapter before ITEM is ever subscribed to (i.e. before the first client subscribes to ITEM) is ignored.

Right, I'd worked out that this is what's going on. Good to have it confirmed though.

If you can subscribe to ITEM from a dummy client when the item state is still empty, then your Data Adapter can always send an empty snapshot and just forward the updates to the Server, which will produce suitable snapshots for ITEM for the real clients.
Dario

Yes, this does do exactly that.