[Bluez-users] simple relay scatternet and a question

[Bluez-users] simple relay scatternet and a question

[안희준]

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Dear Bluezers,

I  am working on contrcuting a simple relay scatternet with CSR-based USB dongle.
Yesterday I made it that 4 dongle relay data from top to down and dwon to top, writing a utility code based on rfcomm program in bluez-util.
I works fine!

    A ------------------>B-----------------> C ------------------> D
       M                        S   M                      S     M                      S


But, while I am running it serveral time. I got a one difficult problem "Can't bind: Address already in Use!"
This is old problem in TCP/IP socket program, when the server clashes without close the socket, so that the well-kown (or fixed anyway)
cannot be resused again for a several minutes in typical TCP/IP socket program.   

But! what is the port in rfcomm socket? Is this channel numer? or board address?.
And Can I use socketopt system call for the rfcomm socket ?  for RESUSE option!
Also, the socket address is not freed for even 30 minutes, while usually TCP/IP port is can be resued after several minutes!
What part of kernel stack has something with this??? rfcomm.o ???? 

Please kindly comment this.


Thanks.

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Re: [Bluez-users] simple relay scatternet and a question

[Marcel Holtmann]

Hi,

> I  am working on contrcuting a simple relay scatternet with CSR-based
> USB dongle.
> 
> Yesterday I made it that 4 dongle relay data from top to down and dwon
> to top, writing a utility code based on rfcomm program in bluez-util.
> 
> I works fine!
> 
>  
> 
>     A ------------------>B-----------------> C ------------------> D
> 
>        M                        S   M                      S     M
> S
> 
>  
> 
>  
> 
> But, while I am running it serveral time. I got a one difficult
> problem "Can't bind: Address already in Use!"
> 
> This is old problem in TCP/IP socket program, when the server clashes
> without close the socket, so that the well-kown (or fixed anyway)
> 
> cannot be resused again for a several minutes in typical TCP/IP socket
> program.   
> 
>  
> 
> But! what is the port in rfcomm socket? Is this channel numer? or
> board address?.
> 
> And Can I use socketopt system call for the rfcomm socket ?  for
> RESUSE option!
> 
> Also, the socket address is not freed for even 30 minutes, while
> usually TCP/IP port is can be resued after several minutes!
> 
> What part of kernel stack has something with this??? rfcomm.o ???? 

what kernel version do you use and what about showing us your code?

Regards

Marcel




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