Loss of contact with a paired Bluetooth device notification

D

Doctor_E

New Member

• Mar 21, 2009

• #1

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

 

D

Doctor_E

New Member

• Mar 22, 2009

• #2

Any ideas?

Any ideas guys??

:sign0085:

 

Erel

B4X founder

Staff member

Licensed User

Longtime User

• Mar 22, 2009

• #3

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.

 

D

Doctor_E

New Member

• Mar 22, 2009

• #4

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

taximania

Well-Known Member

Licensed User

Longtime User

• Mar 22, 2009

• #5

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

Watch this space . . . . . .

 

taximania

Well-Known Member

Licensed User

Longtime User

• Mar 23, 2009

• #6

ConnectionBluetoothCount always returns: Invalid.

 

taximania

Well-Known Member

Licensed User

Longtime User

• Mar 29, 2009

• #7

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

 

Last edited: Mar 29, 2009

taximania

Well-Known Member

Licensed User

Longtime User

• Apr 4, 2009

• #8

Doctor_E said:

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.

Click to expand...

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

rtLocalMachine("System\State\Hardware\","Handsfree")
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.

 

Attachments

• headset.zip

  14.8 KB · Views: 187

Last edited: Apr 4, 2009

P

pinoy_ako

Member

Licensed User

Longtime User

• Apr 22, 2009

• #9

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.