Custom GPS Tracker App

I own the GPS tracker shown here: https://www.alibaba.com/product-detail/subject_62553862078.html?from=share&ckvia=share_2af4031047d24c938f874c81c173f3f1 and have full access to its open-source firmware and communication protocol... (Budget: ₹12500 - ₹37500 INR, Jobs: Android, Android App Development, Flutter, iOS Development, iPhone, Mobile App Development, PHP, React Native)