.NET Components for Mobility

Broadcom SDK on PC & PPC - multiple L2Cap & SCO connections

Last post 05-13-2008 5:29 AM by Ineffigy. 2 replies.
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  • 12-04-2006 3:20 AM

    Broadcom SDK on PC & PPC - multiple L2Cap & SCO connections

    This is the closest I can find to a Broadcom SDK forum.  If anyone knows of a more appropriate place, please let me know.
     
    I'm trying to make multiple l2cap level connections between some custom devices and an iPaq 4700 running WM5 and Broadcomm 1.7.1 3400, or a PC (XP).   My application (PhD project) requires multiple (up to 7) simultaneous connections to custom devices from either a PPC or a PC.  Up to 2 of those connections will involve an audio link (currently SCO, but I may have to upgrade to a2dp).  I'm connecting at the l2cap layer because of the "2 virtual serial ports" limitation on the PPC.
     
    I started using the Broadcom SDK c++ libraries and a c++ MFC app.  I have since rolled my own dll and am now using c# as my user interface.  Multiple l2cap connections with low bandwidth data is working well.  
     
    Now I'm trying to add SCO (audio) connections.  If I have a single l2cap connection, I can add an SCO connection, and all works well.  However, if I make another l2cap connection before initiating the SCO connection, SpyLite tells me "Add Sync - command not allowed".  Also, once I have my one SCO connection working, I am not getting any events regarding subsequent l2cap connection requests.
     
    Does anyone have any experience with such things?
     
    Thanks,
    Cyle
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  • 05-02-2008 3:31 PM In reply to

    Re: Broadcom SDK on PC & PPC - multiple L2Cap & SCO connections

    Were you able to create multiple SCO connections?

  • 05-13-2008 5:29 AM In reply to

    Re: Broadcom SDK on PC & PPC - multiple L2Cap & SCO connections

    Using the SCO procotol, it guarantees a 64 kbps transfer rate. In order to ensure that the connection rate can be guaranteed there are some limitations to using SCO. No Bluetooth device is allowed to have more than 3 SCO connections at one time. 2 Bluetooth devices can at most have 1 SCO connection between them. SCO should only be used for voice quality audio. Are you breaking any of these rules? It could be the cause of your error.

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