RaceChrono Pro download link:App Store “RaceChrono Pro” (apple.com)
NOTE:
Just enable Bluetooth settings on your iOS device.
DO NOT Need to connect Bluetooth Name on iOS device.
Then connect the Bluetooth device name in the OBD app setting.
Step1:
Click the Settings button in the upper right corner.
Step2:
Click on "Add OBD-II reader"
Step3:
Click on "Vgate vLinker/iCar BLE/BT4.0"
Step4:
Select OBD-II reader "vLinker FD-IOS".
Step5:
Return to home page after selecting OBD II device.
Step6:
Click on "START"
Step7:
Connected successfully.