RFCOMM Question
Hi Marcel,
I two simple Questions :
1.) How many RFCOMM-Connections can be made to a single usb-Stick on Linux
2.) Is there a timeout which closes the connection, if there ist no traffic for a certain time.
We plan to connect 10 devices via serial connections to a single server to transmit periodically data.
Thanks in advance,
Kasimir
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Marcel Holtmann
maintainerHi Kasimir,
Quoted 1 line
1.) How many RFCOMM-Connections can be made to a single usb-Stick on Linux
you can have up to 30 connections per direction per ACL link.
Quoted 2 lines
2.) Is there a timeout which closes the connection, if there ist no traffic for a certain time.
No.
Quoted 2 lines
We plan to connect 10 devices via serial connections to a single server to transmit periodically data.
This is different from the number of RFCOMM connections, because you can only connect up to 7 seven active slaves at the same time. But with each slave you can have 30 RFCOMM connection in each direction.
Regards
Marcel
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Marcel Holtmann
maintainerHi Kasimir,
Quoted 4 lines
The problem is, I must have at least 10 distinct connections from 10 devices, which must be
identified by e.g. Hardware-Adress .
So I must use 2 sticks on the server side ?
if you need 10 connections at the same time, then yes, you should better use two adapters. Remember that you can have 10 connections at the same time, but 3 of them must be parked.
Quoted 1 line
Thanks again very much for your quick and competent answer.
You are welcome.
Regards
Marcel
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Marcel Holtmann
maintainerHi Kasimir,
Quoted 7 lines
Quoted 4 lines
if you need 10 connections at the same time, then yes, you should better use two adapters. Remember that you can have 10 connections at the same time, but 3 of them must be parked.
Sorry , I was precise.
I going to read the status of the 10 devices sequentially . So I can switch the connection ?
you can park 9 of your connections and only unpark the one that you need. I must admit that I never tested such a setup.
Regards
Marcel
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