I'm looking for a bluetooth 4.0 (BLE) adapter for raspberry pi with an external antenna acting as a bluetooth signal booster.
My raspberry pi is inside locked booths of parking lot which senses the cars passing by. These guest cars are provided with bluetooth odb adapters. But the problem now is if the booth is closed (as it is unmanned), the bluetooth signal strength is not that great. I'm not interested in rssi adjustment solutions for proximity decisions. I've tried those.
I want to know if there are off the shelf bluetooth adapters with the external antenna.