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https://github.com/Mixiaoxiao/Arduino-HomeKit-ESP8266 you mentioned above, is a port of the espressif lib to nonos/arduino core. It shares the wolfssl lib used by espressif, but as it is portrd to nonos, wifi disconnects during srp and devices cannot connect to it. There’s an improved version here: https://github.com/Yurik72/ESPHap which have patched wolfssl that I have changed to prevent wifi disconnections on SRP calculations. Yuri (the Author) made a great job improving original port, like memory management, moving pairings storage to the file, and so on. It still has wolfssl, which is at least redundant as arduino core already have bearssl bundled. Also, this lib has a memory leak during the pairing process, which is not so important as pairing usually made just once. I am currently trying to find where this leak is, but looks like it is somewhere in between the lib and wolfssl. So, I’d like to replace wolfssl with bundled bearssl, if I’d have a free tome to do that.
Well, found it. It uses "humidity", which is not really good as it adds fake prarmeters I (and him) don't really have
espressif official hap https://github.com/espressif/esp-homekit-sdk is RTOS based and cannot be used with arduino due to that. But it works, although has some disadvantages, like storing pairing data on the dedicated partition.
https://github.com/Mixiaoxiao/Arduino-HomeKit-ESP8266 you mentioned above, is a port of the espressif lib to nonos/arduino core. It shares the wolfssl lib used by espressif, but as it is portrd to nonos, wifi disconnects during srp and devices cannot connect to it. There’s an improved version here: https://github.com/Yurik72/ESPHap which have patched wolfssl that I have changed to prevent wifi disconnections on SRP calculations. Yuri (the Author) made a great job improving original port, like memory management, moving pairings storage to the file, and so on. It still has wolfssl, which is at least redundant as arduino core already have bearssl bundled. Also, this lib has a memory leak during the pairing process, which is not so important as pairing usually made just once. I am currently trying to find where this leak is, but looks like it is somewhere in between the lib and wolfssl. So, I’d like to replace wolfssl with bundled bearssl, if I’d have a free tome to do that.
Also, for esp32 the situation is much better. As arduino core for esp32 is rtos based, it is possible to simply use espressif hap sdk from arduino corr or directly from bundled RTOS. Esp32 is much faster, SRP, which is the most time consuming, takes a second on it, while it could take up to 20+ seconds on esp8266. There’s also a nice HomeSpan app example for esp32/arduino https://github.com/HomeSpan/HomeSpan. Author calls it “library”, but it is more like a complete app, which can be highly customized and, I suppose, it is also possible to reuse just a necessary parts of it, just like a library.