Question

How can i know if a BluetoothSocket is still connected to the endpoint? How can i detect if the socket has been disconnected by the endpoint?

Thanks

Answer 1

In my apps, I keep track of I/O errors. If a successful read() takes place, then I reset the counters. If the error counters go up high enough (4-5 is usually a good number) then I consider the connection dead, and proceed to tear it down and re-build it.

The SDK talks about a state change intent, but I’m not clear whether it’s referring to a specific connection, or the bluetooth adapter itself here:

Optionally, your application can also
listen for the ACTION_STATE_CHANGED
broadcast Intent, which the system
will broadcast whenever the Bluetooth
state has changed. This broadcast
contains the extra fields EXTRA_STATE
and EXTRA_PREVIOUS_STATE, containing
the new and old Bluetooth states,
respectively. Possible values for
these extra fields are
STATE_TURNING_ON, STATE_ON,
STATE_TURNING_OFF, and STATE_OFF.
Listening for this broadcast can be
useful to detect changes made to the
Bluetooth state while your app is
running.