Bluetooth to Arduino communication

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DR1

Joined Sep 13, 2012
23
Im trying to create a simple android app where I press the button and it sends signal via Bluetooth to turn on light A. Click button 2 , turns on light B on ardiuno. Im a bit confused on how data is sent over Bluetooth(other than it uses serial connection to talk to arduino) though, can anyone explain what needs to happen for me to get this light to turn on?
 
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