Hopefully soon I can update my installation. Currently only 14 is offered as the latest version in the admin interface. After this had been done, I can do intense testing with Friendica, which offers ActivityPub in the upcoming version as well.

In preparation to this tests, possibly a developer of this app can answer some question?

which activities (“Create”, “Announce”, “Like”, “Dislike”, “Update”, “Delete”, “Accept”, …) are supported?

which content types (“Note”, “Article”, “Video”, “Image”, “Event”, …) are supported?

which account types (“Person”, “Organization”, “Service”, …) are supported?

Are linked signatures used? If yes: Which library is used for this?

How is the receiving comment distribution done? Does the receiver relay the received comments if it was the receiver’s post that started the thread?

Does the app accept posts that are relayed (means: the http signature is not done by the actor)?

Does the app fetches missing posts, when a comment arrives to a post that isn’t currently available at the system?

If the answer to some of the questions is “no”, I would like to offer my support. I had implemented AP for Friendica: https://github.com/friendica/friendica/tree/2018.12-rc/src/Protocol/ActivityPub

If someone from the developer team of this app is at the C3 in Leipzig, I really would like to get in contact there.

P.S.: I hope that some more developers of AP implementations will be at the C3, I really would like to get in contact with them, so that we could better work at improving federation issues.