Hi,

implemented Proof of Concept for HomeKit Accessory Protocol for D on Linux.
a lot of stuff was ported from HAP-NodeJS project and homekit_python.

https://github.com/shabunin/hap-d

Works: pairing procedure and basic lightbulb accessory control - [GET /characteristics] and [PUT /characteristics] method. Not implemented: persisted pairing(at a moment no info is saved), better abstractions to work with accessories(callbacks, etc).

Dependencies are only libsodium for cryptographic methods. Multicast DNS advertisement is implemented in pure D.
I didn't use vibe-d or some other HTTP-server framework due to nature of HomeKit protocol. At first, when pairing was not established yet, HTTP-requests are pretty normal. But when pairing is done all communications become encrypted. Socket is still open(like keep-alive session) but now every message has no HTTP structure - you should decrypt it first. So, kind of middleware function is required for vibe-d. I couldn't find the way to do it and used own HTTP-server.

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First things I would like to do next is to review code with fresh look, create better file structures and think about general app architecture - how abstractions for accessories should be done - classes, callbacks, etc.

Debugging pairing procedure was hard part but it is done at this moment. I'm asking now community to join me in next development. Critiques, advises, propositions, code commits will help in making great project.