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I'm planning to create a Arduino device that measures distance, and sends the data to AWS IOT via WIFI . After that i want to see the measurements on an Android or iphone App.
How can i make my idea to work with lots of users? I mean, lets say I sold 100 devices, how each buyer will connect to his own device?
I'm thinking that each Arduino will have a Unique ID/UUID, but how do I make that with AWS IOT? Should I use other server/MQTT platform?
I'm using Arduino ESP32.
What you seem to be looking for is called provisioning, and it is quite a complex subject, as you can see from this Amazon page picked at random. You're right to be starting to think about at-scale deployment, and there are other related activities that you might want to start thinking about too (how can you ban tampered devices, how do you track devices without required OTA firmware), how can users transfer/sell devices (if your business model is to sell rather than lend).
You have a few options:
Rest assured that any genuine IoT platform will provide an answer to this aspect of the service. Maybe with varying completeness, but it is something that is fairly fundamental.
You could use the device MAC as a unique identifier of the device. Structure your MQTT topics so that the device unique identifier is part of the topic, then use ACL (access control lists) to limit subscription/publish to the respective topics. I use Mosca MQTT broker with this approach and handle 10+K devices this way.
