An example of developing software for interacting with children's watches?

Question

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Good afternoon. We bought a security watch for the child (with gps, wiretapping, and so on). To interact with it, they installed the appropriate software on their phones (moreover, not native, but third-party). And then a "bad" thought came, and not to try to make such software yourself (to indulge at your leisure).
Can someone tell me which way to dig (tutorial, example, api, etc.)?
Thanks in advance.

Answer 1

A very interesting topic. We bought a Q-50 watch for my daughter, I downloaded the offer from the Play Store. Not all features work properly. I would like to set a more convenient offer.