2. Re: Re: Re: Bluetooth SCO message sending (sco_send_frame)
In my case, there is some problem when I connect SCO over UART(h4). When I sent data to h4 interface, h4 make frame and btsco sent that frame to the SCO channel.
The frame size from h4 interface is varied periodically and somtimes larger than MTU size so SCO channel drop several frames.
Of course I changed the MTU size using "hciconfig scomtu" command but it is not effective at all.
Now, I tested the problem using samsung module based on CSR bluecore chipset.
However, there is no problem if I use SCO over USB because the frame size from USB is always same & smaller than MTU.
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Youngwoo Park M.S. Student CORE(COmputer engineering REsearch) Lab Dept. EECS, KAIST, Daejeon 305-701, Korea Phone: +82-42-869-5425 Fax: +82-42-8695425 e-mail: [email protected] -- ------------------------------------------------------- SF.Net email is Sponsored by the Better Software Conference & EXPO September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf _______________________________________________ Bluez-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/bluez-devel
Marcel Holtmann
maintainerHi,
Quoted 8 lines
In my case, there is some problem when I connect SCO over UART(h4). When I sent data to h4 interface, h4 make frame and btsco sent that frame to the SCO channel.
The frame size from h4 interface is varied periodically and somtimes larger than MTU size so SCO channel drop several frames.Of course I changed the MTU size using "hciconfig scomtu" command but it is not effective at all.
this command is useless.
Quoted 4 lines
Now, I tested the problem using samsung module based on CSR bluecore chipset.
However, there is no problem if I use SCO over USB because the frame size from USB is always same & smaller than MTU.
As I told you, the kernel will tell you the MTU size you have to use and then you must segment and reassembly in your code.
Regards
Marcel
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