Loss of contact with a paired Bluetooth device notification

Discussion in 'Questions (Windows Mobile)' started by Doctor_E, Mar 21, 2009.

  1. Doctor_E

    Doctor_E New Member

    Hi there,
    I would like to ask if there is a way to use serial2 library in order to create an application (probably run in the background) which notifies the user (with an msgbox or a sound notification) when a paired bluetooth device looses the contact with the smartphone.

    Thanx in advance ;)

    PS: Not necessarily restricted to serial2 library, if there is another way (registry getvalue + timer or something) please let me know :cool:
  2. Doctor_E

    Doctor_E New Member

    Any ideas?

    Any ideas guys??

  3. Erel

    Erel Administrator Staff Member Licensed User

    Agraham's SystemState library can monitor a property named: ConnectionBluetoothCount.
    You could use it to monitor the number of connected devices.
    I didn't try it so I don't know whether each paired device is counted as a contacted device.

    Note that this library is only available to users who bought Basic4ppc.
  4. Doctor_E

    Doctor_E New Member

    Thanks a lot Erel! One last question. Does anybody know if there is any value in the registry which changed in real-time when a device is paired or unpaired?

    I know there are some keys in HKLM\Software\Microsoft\Bluetooth\ which may be related.

    Thanks again, I really appreciate your help. :icon_clap:
    Last edited: Mar 22, 2009
  5. taximania

    taximania Well-Known Member Licensed User

    Im going to spend a bit of time on this one.

    Watch this space . . . . . .
  6. taximania

    taximania Well-Known Member Licensed User

    ConnectionBluetoothCount always returns::confused: Invalid.
  7. taximania

    taximania Well-Known Member Licensed User

    I now have a working basic4ppc.dll that can show all bluetooth devices in range :)

    What I don't have yet, is the ability to detect if they are connected,
    or connect to them :sign0137:

    Half way there :cool:
    Last edited: Mar 29, 2009
  8. taximania

    taximania Well-Known Member Licensed User

    I've found a registry key that sort of works.

    This key is 0 when my BT headset is 'not' connected, and '1' when it is.

    I've attached a small example program.
    Switch your headset on and press the 'monitor' button in the app.
    If the connection is lost you get a notification.
    If the connection is re-established you get another notification.

    Attached Files:

    Last edited: Apr 4, 2009
  9. pinoy_ako

    pinoy_ako Member Licensed User

    when connected to a device, try continously sending byte with a timer to bt serial port, it will generate error if connection lost. or, other device send byte, poll it with a timer. timer reset when when byte arrives. if byte stops arriving, timer will tick. notification is faster than with this.
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