RE: [Bluez-users] ISSC USB dongle can't ping with size 1000

RE: [Bluez-users] ISSC USB dongle can't ping with size 1000

[Al]

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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: bluez-users-admin@lists.sourceforge.net 代理 Marcel Holtmann 
	Sent: 2006/2/23 [星期四] 下午 07:23 
	To: bluez-users@lists.sourceforge.net 
	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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[Bluez-users] Rfcomm connection with pin number question

[Agustin Jose Fusaro]

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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