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Sending a bluetooth signal from NXT to smartphoner.

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http://androidforums.com – Hi! The app I'm building is basicly an "alarm" if you will. A Lego Mindstorms NXT-unit will send a message to the target smartphone (I'm thinking a simple bool will suffice). Once the phone receives the message it will dial the first number in a list. If there's a "busy signal" it will continue with the next number and when the list is exhausted there will be an "Alarm Failed" message. Most of the samples I keep stumbling upon on Google deals with stuff happening once there's been a connection. What classes and methods should I use if I want something to occur (General)