Modify scotest?
Hi@ all!
I have the following problem, maybe you can help me.
I need to meassure the quality of a bluetooth SCO link, therefore I want to send a data file over a SCO Link like OBEX.
So I want to see whats transmitted on client side, comparing with the original file, for the purpose to detect bit errors a.s.o.
Is this possible with the scotest tool - actually it seems to me that I can only send a predetermined number of bytes through the SCO connection and receive them on the client side. Or am I wrong and there is another solution for my project ?
Regards
Wolfgang
Ps. I have two Bluecore 3 Dongles, SCO is mapped to HCI - if its relevant.
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Marcel Holtmann
maintainerHi Wolfgang,
Quoted 4 lines
I need to meassure the quality of a bluetooth SCO link, therefore I want to send a data file over a SCO Link like OBEX.
So I want to see whats transmitted on client side, comparing with the original file, for the purpose to detect bit errors a.s.o.
Is this possible with the scotest tool - actually it seems to me that I can only send a predetermined number of bytes through the SCO connection and receive them on the client side. Or am I wrong and there is another solution for my project ?
don't use SCO channel for data transmission, period.
Regards
Marcel
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Using SCO for quality measurement is a good idea if your bluetouth device supports trasnparent audio, and if you configure them to use this mode. If not, you can still try a configuration like ulaw on air, ulaw on HCI (no conversion in theory)
In this case, write a tool like scotest that always send FF.FF.FF...FF frames (or anything you want) (write the same amount of data that you receive). Then juste count zeros bits to detect BER, and 00.00.00...00 frames for PER. Enjoy !
Arnaud
Quoted 19 lines · Marcel Holtmann
Hi Wolfgang,
Quoted 5 lines
I need to meassure the quality of a bluetooth SCO link, therefore I want to send a data file over a SCO Link like OBEX.
So I want to see whats transmitted on client side, comparing with the original file, for the purpose to detect bit errors a.s.o.
Is this possible with the scotest tool - actually it seems to me that I can only send a predetermined number of bytes through the SCO connection and receive them on the client side. Or am I wrong and there is another solution for my project ?don't use SCO channel for data transmission, period.
Regards
Marcel
Quoted 12 lines
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Marcel Holtmann
maintainerHi Arnaud,
Quoted 4 lines
Using SCO for quality measurement is a good idea if your bluetouth device supports trasnparent audio, and if you configure them to use this mode. If not, you can still try a configuration like ulaw on air, ulaw on HCI (no conversion in theory)
no it is not a good idea. The chip will insert bits/bytes/frames as it thinks it needs to. The transparent audio is not guaranteed. Read the posts from the CSR guys for any details.
Quoted 4 lines
In this case, write a tool like scotest that always send FF.FF.FF...FF frames (or anything you want) (write the same amount of data that you receive). Then juste count zeros bits to detect BER, and 00.00.00...00 frames for PER.
Get a CSR development kit and get their BCCMD specification and use their internals to get the BER values.
Regards
Marcel
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