Do you want a sensor at every door, window and room? We do, but not at todays prizes.
We want to be able to measure every part of our surrounding and to be able to that we need to have simple and cheap sensors that communicate wireless. Looking at the alternatives it's hard to find a platform that can handle a wide range of sensor types and we can afford to buy a lot of.
Therefore have we started developing a cheap platform based on ESP8622 that can handle anything from digital sensors (buttons, magnetic door switches etc) to 1-wire (temperature, humidity etc).
This includes both a versatile hardware platform and software both for the sensor platform and for the server.
The server software is currently only self hosted but we see advantages for supporting the dashboard as a service in the cloud for people who don't want to host themselves.
I have played with Bluetooth and found it temperamental.
Windows needs you to go through a "ritual" to connect.
WiFi and a webpage are a dream relatively.
My 2 cents worth, AlanX