android Bluetooth module to determine how active device is disconnected

Bluetooth android microcontroller data phone

I'm here to do is a Bluetooth phone connection microcontroller, the microcontroller sends data to the phone, the phone through a series of operations, I call over bluetoothSocket of isconnect () method, also called off bluetoothdevice broadcast, found that they were only detect the phone Method initiative disconnect the device, but the device is disconnected and they did not respond proactively, I do not know how to achieve here, seeking answers, I connect microcontroller
A pairing
Two connecting
Third, a successful connection has been blocked on the open thread waits to receive data sent

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