Hi all, can someone please enlight me on the following?
What is the maximum number of RFCOMM connections for each bluetooth dongle
with BlueZ?
Thanks in advance
Thanks all for the fast feedback and my apologies if my question wasn't
specific enough =)
I have one more doubt, though.
Knowing that each hci device suports 7 ACL, do SDP queries and hci scans
count as ACL when performed, even momentarely?
Hi Manuel,
> > the answer is quite simple. Per ACL link between two devices you can
> > have 30 RFCOMM connections and another 30 one initiated by the other
> > device. Every piconet can have 7 ACL links and so you can do the math by
> > yourself.
> >
> I'm a bit confused :S. I thought you could only open 7 ACL on each
> device. So according to you I can get 7 ACL and then open up to 60
> RFCOMM over it right?. I guess the bandwidth will be divided between all
> those connections mhh it will be definitely to slow :D.
actually the bandwidth or 1 Mbit or 3 Mbit in case of EDR will also
divided between the 7 ACL links. And yes, the bandwidth will be shared.
Regards
Marcel
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Marcel
> the answer is quite simple. Per ACL link between two devices you can
> have 30 RFCOMM connections and another 30 one initiated by the other
> device. Every piconet can have 7 ACL links and so you can do the math by
> yourself.
>
I'm a bit confused :S. I thought you could only open 7 ACL on each
device. So according to you I can get 7 ACL and then open up to 60
RFCOMM over it right?. I guess the bandwidth will be divided between all
those connections mhh it will be definitely to slow :D.
Thanks,
Manuel
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Hi Manuel,
> Yes you are right, the question is quite tricky.
the answer is quite simple. Per ACL link between two devices you can
have 30 RFCOMM connections and another 30 one initiated by the other
device. Every piconet can have 7 ACL links and so you can do the math by
yourself.
Regards
Marcel
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Yes you are right, the question is quite tricky.
Cheers
> I totally agree with you, but I thought the question was about the
> maximum number of RFCOMM connections.
> When I said 30 I considered scenarios where there could be more than
> one RFCOMM connection between the same two ACL-connected devices...
>
> Actually, I have never implemented such scenario. I agree I am wrong
> if bluetooth doesn't allow to establish such a set of simultaneous
> connections...
>
> Loreno
>
> bluetooth dongle, according to the specs of the BT SIG. And RFCOMM is
> implemented over ACL, so you have a maximum of 7 simultaneous rfcomm
> connections.
> > I believe the maximum number of allowed connections relates to the
> > number of ports available to connect to using rfcomm.
> > Thus, my guess is 30.
> >
> >
> http://people.csail.mit.edu/albert/bluez-intro/x92.html#rfcomm-and-tcp
> >
> > Regards,
> >
> > Loreno
> >
> >
> > Hi all, can someone please enlight me on the following?
> >
> > What is the maximum number of RFCOMM connections for each
> > bluetooth dongle with BlueZ?
> >
> > Thanks in advance
> >
>
>
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> I'm sorry, that's not right. There's a maximum of 7 ACL connections per
>
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I totally agree with you, but I thought the question was about the maximum
number of RFCOMM connections.
When I said 30 I considered scenarios where there could be more than one
RFCOMM connection between the same two ACL-connected devices...
Actually, I have never implemented such scenario. I agree I am wrong if
bluetooth doesn't allow to establish such a set of simultaneous
connections...
Loreno
On 4/22/07, Manuel Naranjo <[email protected]> wrote:
>
> I'm sorry, that's not right. There's a maximum of 7 ACL connections per
> bluetooth dongle, according to the specs of the BT SIG. And RFCOMM is
> implemented over ACL, so you have a maximum of 7 simultaneous rfcomm
> connections.
> > I believe the maximum number of allowed connections relates to the
> > number of ports available to connect to using rfcomm.
> > Thus, my guess is 30.
> >
> > http://people.csail.mit.edu/albert/bluez-intro/x92.html#rfcomm-and-tcp
> >
> > Regards,
> >
> > Loreno
> >
> >
> > Hi all, can someone please enlight me on the following?
> >
> > What is the maximum number of RFCOMM connections for each
> > bluetooth dongle with BlueZ?
> >
> > Thanks in advance
> >
>
>
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> This SF.net email is sponsored by DB2 Express
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>
I'm sorry, that's not right. There's a maximum of 7 ACL connections per
bluetooth dongle, according to the specs of the BT SIG. And RFCOMM is
implemented over ACL, so you have a maximum of 7 simultaneous rfcomm
connections.
> I believe the maximum number of allowed connections relates to the
> number of ports available to connect to using rfcomm.
> Thus, my guess is 30.
>
> http://people.csail.mit.edu/albert/bluez-intro/x92.html#rfcomm-and-tcp
>
> Regards,
>
> Loreno
>
>
> Hi all, can someone please enlight me on the following?
>
> What is the maximum number of RFCOMM connections for each
> bluetooth dongle with BlueZ?
>
> Thanks in advance
>
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I believe the maximum number of allowed connections relates to the number of
ports available to connect to using rfcomm.
Thus, my guess is 30.
http://people.csail.mit.edu/albert/bluez-intro/x92.html#rfcomm-and-tcp
Regards,
Loreno
On 4/22/07, Jos? Pedro Saraiva <[email protected]> wrote:
>
> Hi all, can someone please enlight me on the following?
>
> What is the maximum number of RFCOMM connections for each bluetooth dongle
> with BlueZ?
>
> Thanks in advance
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by DB2 Express
> Download DB2 Express C - the FREE version of DB2 express and take
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>
>