Hi Ramana,
I don't understand what you need ?
If you are talking about the transmit throughput so you can using the 1 ms timer, count 1000 ticks, and during these ticks, count how many bytes you sent. The function SPP_DataWrite is a blocking function and return the number of bytes really sent. So don't count the number of bytes you want to send, but only the number of byte really sent.
In SPP example, you will see that the bluetooth stack is synchronized on 1 ms timer interrupt.
thanks,
Mikael