It may not check all of your boxes, but the waku protocol and applications’ use of it have been evolving since 2018: https://waku.org/ https://waku.org/ https

It may not check all of your boxes, but the waku protocol and applications’ use of it have been evolving since 2018: https://waku.org/ https://waku.org/ https://github.com/waku-org/nwaku https://github.com/waku-org/nwaku