If you're a developer interested in IoT, I don't think you need to start with an industrial-scale project.
Build something tiny.
For example:
Temperature sensor
↓
ESP32 / Raspberry Pi
↓
MQTT
↓
Backend
↓
Database
↓
Simple dashboard
You can even simulate the sensor at first.
Generate:
temperature = 25.7
Then send it through your pipeline.
Once that works, start breaking things.
Disconnect the device.
Send bad data.
Send duplicate messages.
Add an alert.
Store historical readings.
Try processing some data locally.
Those little experiments teach you much more than simply reading about IoT architecture.
Start small.
Then make the system harder to break.
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