Hi, we are a team of developers with expertise in software and hardware, specifically BLE. Also we have lot of experience with OBDII and CAN bus protocols, Texas Instruments CC254x BLE hardware/firmware etc. From software point of view we worked on both Android and iOS applications utilizing BLE, iBeacon, CoreLocation and CoreBluetooth so we can help in app development if needed.
We would need to build electronic dongle module and custom firwmare, there are various ways how to implement it so we would have to discuss in more details your exact needs.
Can you also tell me do you already have BLE profile defined for app you're developing?