Servo motor not rotating on signal (but connected, via android bluetooth apps)

I built my project according to this site ->

Kindly give the above link a read first.

I have arduino mega 2560, bluetooth module HC05 and servo motor 9g. I set up everything according to the site above.

When I send signal (0 or 1) through serial monitor, my servo rotates..... but through android apps (including app named: bluetooth terminal), even when my HC05 is connected with app via bluetooth, servo motor does not rotate when I send the signal (0 or 1). Why? All connections are same. Devices are fine. Please help me!!!!

Sorry but lots of information is missing.
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Have you tried printing what you get from Bluetooth on your serial monitor? Is it what you think you should get?
Paul

No. I dont know how to do that. Looking it up on internet..

Hello,
do you have knowledge about electronics and programming in C++?

Yes. basic.