Well after a few hours of trying several ways to turn an LED on or off via a bluetooth terminal on my Android with the BT module connected up to the tablet & the Arduino I found out how to do it but there were problems..
I managed to be able to send text from Android to Arduino Serial monitor and vice versa but no luck with turning pins on & off...
After a little web searching I found out that serial port 0 is also used in the USB configuration debug so changing the Serial port used from 0 to 2 I can now control the pins from Android and turn LEDs on and off.
A simple program involves opening a serial port and when serial data is available, reading the incoming data and using if statements to turn the pins on or off. There is a nice project here:http://www.instructables.com/id/Andruino-A-Simple-2-Way-Bluetooth-based-Android-C/?ALLSTEPS
that I have now got working.
I changed all Serial commands to Serial2 commands though.....Now to get my teeth into the Ketai library..