Thanks for your suggestion ,
We already done with the send and receiving the string between two devices with Rho-Application.
But we need to receive the data from external device with Bluetooth connectivity.
Thanks for your help
Using BluetoothSession API you should be able to read the from the serial port irrespective of where its being sent from.
Read data from the connected device. Returns an array of bytes.
Read string from the connected device. Returns a string.