HomeKit - How does iOS device control accessories remotely?

Hi,
How does iOS Homekit apps communicate to the accessories remotely?
What is the role of Apple's Home Automation Protocol? Very minimal details about home automation protocol is available at developer.apple.com.
Can you please provide details about 'Remote communication' and 'Apple's Home Automation Protocol'?
Thanks in advance

Hey, I am also doing the same project. Have you got any solution. If you have any can send me your VI. Otherwise contact me after few weeks as I am going to finish my project in 3 more weeks.So, I can send you my VI, hopefully I will complete by then.

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