[Bluez-devel] Time Between Rfcomm Connections

[Bluez-devel] Time Between Rfcomm Connections

[Artur Almeida]

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Hi

 Im testing a few dongles that i bought but none of them is able to achieve
7 simultaneous rfcomm connections in a piconet. Im a master in all
comunications and i initiate the connections with the mobile phones,
depending on the ship provider the max number of communications i managed to
establish was 5, in a 1.2  broadcom bluetooth dongle, tipcally i can only
establish 4 in a silicon wave or Csr dongle (All 1.2). Also, the delay that
i have to force between rfcomm connections varies from 2 to 3 sec depending
on the ship provider, otherwise i get resource busy messages. Can someone
point me a bluetooth usb dongle that is able to establish 7 rfcomm
connections? I thought this was a mandatory request from the bluetooth spec
but i tested more then 15 diferent dongles and the best i got was 5.
Concerning the delay between rfcomm connections , is this something
controled by bluez or some limitation in the ship provider?

Thank You

Regards

Artur

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Re: [Bluez-devel] Time Between Rfcomm Connections

[Marcel Holtmann]

Hi Artur,

>  Im testing a few dongles that i bought but none of them is able to
> achieve 7 simultaneous rfcomm connections in a piconet. Im a master in
> all comunications and i initiate the connections with the mobile
> phones, depending on the ship provider the max number of
> communications i managed to establish was 5, in a 1.2  broadcom
> bluetooth dongle, tipcally i can only establish 4 in a silicon wave or
> Csr dongle (All 1.2). Also, the delay that i have to force between
> rfcomm connections varies from 2 to 3 sec depending on the ship
> provider, otherwise i get resource busy messages. Can someone point me
> a bluetooth usb dongle that is able to establish 7 rfcomm connections?
> I thought this was a mandatory request from the bluetooth spec  but i
> tested more then 15 diferent dongles and the best i got was 5.
> Concerning the delay between rfcomm connections , is this something
> controled by bluez or some limitation in the ship provider? 

I am unsure about the other manufacturer, but I thought that CSR chips
with at least HCI 18.x are capable of it. And actually I pretty sure I
already had such weird setups with a bunch of mouse and keyboard
devices. However nothing in the specification mandates that you have to
support this number of devices in a piconet. It is the maximal possible
number of device,s because they use only 3 bits to identify an active
device in a piconet.

Regards

Marcel




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