Starting a smart home project

My family is moving to a new home soon. I was thinking of setting up a smart home system for my new home. After looking at some of the commercially available solutions, either they are very expensive or I do not trust their security, so I decided to assemble and build one myself.

In order to make the smart home modular and can cater for expansion, I have decided on the following considerations and design parameters when building up the smart home.

The hub software has to be Open Source.
The switches, lights and sensors can be either open source hardware or the devices must be using 1 of the open IoT protocols such as MQTT, CoAP RestAPI.
Open and easily available SoC (System on Chips) hardware such as Raspberry Pi.
Open and easily available software/hardware based on common IoT development platform e.g Arduino or PlatformIO.
The ability to integrate to smart devices such as Google Home Assistant, Amazon Alexa and Apple Homebridge.

Ha ha,😂😂 this sounds like I am going to give myself a project requirement.

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