All,
Please have a look at DreamFactory an open source REST API automation platform for mobile, IoT, and web applications (https://www.dreamfactory.com/features)
It claims that it can generate REST API for an backend, services. It would be great if anyone can have a look at it and if it does what it claiims, then I believe we can have auto generated REST API for TI which then can be used by mobile apps.