@freamon Create(ChatMessage) is not part of ActivityPub. From my light research online it is something added by a Pleroma extension and possibly supported by Lemmy.

NodeBB will automatically slot received non-public notes as chat messages.

Ah, that's unfortunate. When NodeBB sends a chat message out, it is just a regular Note with the recipients directly addressed, with no as:Public pseudo-user.

So as long as PieFed handles mentioned-only notes the activity should be processed...

@freamon Update: no, Lemmy doesn't understand them either. It rejects Create / Note without a community with the usual "did not match any variant of untagged enum AnnouncableActivities"

@nutomic@lemmy.ml thanks for the update! That's awesome to hear

@freamon thanks! Happy to look into handling Create(ChatMessage)... I think the error aside, NodeBB would drop it anyway since ChatMessage isn't an expected post type.