Good day! I guess there are a lot of ways to connect freeimu sensors to the arduino uno r3 to each other, I didn’t try to do this myself, but here you can find an article, that might be useful for you to do that – this is an article on IT-related blog, feel free to contact me and leave any feedback, both positive and negative, thank you!
Hey! I have not encountered such a problem, but perhaps you can find a solution in this article – https://computools.com/iot-software-development/
Hi! I’ve never faced such situation. But you can contact one of the top mobile app development companies. Maybe they can help you find the answer.