Zigbee is a protocol that has been around for quite a long time, and you can purchase many cheap smart sensors to incorporate ...

The ESP32 based sensor nodes publish their readings to an MQTT broker running on the Raspberry Pi. The Pi subscribes to these sensor node topics to pick up the relevant sensor data.

Espressif’s ESP32 microcontrollers come with a Flash encryption feature that when enabled ensures that the data and code stored on the (usually external) Flash chip is encrypted with AES-256 … ...

T he ESP32 is an incredibly versatile microcontroller, and so long as you have the wires and the hardware to connect it to, ...