Hi, Marcel:
Frankly I don't know much about ISSC chip's internals since I work mainly
at application level. Your comments and information are highly appriciated and
I will pass them to ASIC and System team to see if I can get some feedbacks.
In the mean time, I wonder if there is a work-around solution to this problem.
For example, set MTU to 1000 or refrain BlueZ HCI to send smaller packet size.
Also, can you tell a bit more about the buffer size you mentioned? Where I can
modify for a quick test and what's the current buffer size?
Best Regards,
Al
-----Original Message-----
From: [email protected] ?N?z Marcel Holtmann
Sent: 2006/2/23 [?P???|] ?U?? 07:23
To: [email protected]
Cc:
Subject: Re: [Bluez-users] ISSC USB dongle can't ping with size 1000
Hi Al,
> > I have the same problem as below which was posted last month.
> >
> > > I started to play with the ping size. 'ping -s 900' works, 'ping -s 1000'
> > > kills the PAN connection. There was hope! Then I played with MTU (on both
> > > sides): 'ifconfig bnep0 mtu 1000' solves all my problems (default is
> > > 1500)!!! With this setting I've a rock solid 75 kByte/s transfer rate over
> > > ftp. A mtu of 1017 still works, 1018 definitely kills the connection.
> >
> > I wonder if there is other solutions to this problem cause the above solution needs to set MTU to 1000 on both sides.
> >
> > I try ISSC dongle with IVT software as NAP on Windows XP. Ping with size
> > 1500 works fine. It seems ISSC chip has some problems to work with BlueZ, in
> > addition to adding HCI_RESET.
>
> I am pretty sure that your chip is at fault here. I have no internals
> about your chip, but whatever buffer size you tell us, we will use. And
> BlueZ will use it as fast as possible. The latency is very low and the
> HCI flow control works fine. So I assume there exists a race condition
> in your side of the HCI flow control implementation which triggers a
> problem. You can verify with hcidump that we do everything right. The
> faulty application is actually not BNEP here. I think you can reproduce
> it with any program sending big L2CAP packets. So a test setup with
> l2test and different MTU might trigger it more easily.
and I just did a quick search through the mailing list archive and
actually I found these four version:
ACL MTU: 678:12 SCO MTU: 48:5 LMP Ver: 1.1 LMP Subver: 0x172
ACL MTU: 678:8 SCO MTU: 48:5 LMP Ver: 1.1 LMP Subver: 0x1a4
ACL MTU: 678:8 SCO MTU: 48:10 LMP Ver: 1.2 LMP Subver: 0x1ae
ACL MTU: 678:8 SCO MTU: 48:10 LMP Ver: 1.2 LMP Subver: 0x1f4
The LMP Subver must somehow decode into the version number of your
firmware, but I have no idea how. However you see the different ACL MTU
sizes the chip offers and BlueZ is simply using them.
Regards
Marcel
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Hi everybody,
I'm writing an application that uses rfcomm sockets to connect to remote
devices. I'm using some of the example code for how to use the blueZ
api, from Marcel.
I wanted to know if there's a way of connecting to a remote device, that
needs a PIN number, without using the pin helper file or any of those
scripts... I just want to connect to the device passing, for example,
the pin code as a function parameter.
Does anybody know if this can be achieved using the blueZ library, and
not using the pin helper file?
Thanks a lot!!!
Agustin Fusaro - Apexar Technologies
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