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RE: [bluetooth-dev] using axis stack for emulation purposes
> Has anybody already used it? Does it work properly? And what
> does it do
Currently, it works only for one master and a slave.
> I am working on a research project on bluetooth and
> I would like to
> have different hosts on a lan emulating a bluetooth piconet.
> Would it be
> possible to use the stack to do something like this, or I
> could just emulate
> a single master-slave connection? Could it be possible to improve the
> software and make it do what I need?
Sure, but then I think you need to separate the hci emulation
code from the stack and make it a standalone app which has a
number of 'hci_handle ports'.
If you want to run e.g 7 client (usermode) stacks towards
one server on one computer to simulate a piconet you can
start with creating a hci emul app that creates e.g 7
unix sockets (see below). Each socket interface will act
similar as the current hci emulation but the hci emul app
will also keep track of the different connected hci
handles (if more than one connection) and routes the data
streams to the corresponding socket.
Later on this could be done dynamically like a real BT module
e.g you have one server socket where you send a connect request and
then you get back a hci handle nbr which you then use to open
e.g hci_emul_xx where xx is the handle number.
> I read in a note that the HCI emulation simply converts some
> hci commands to
> the corrisponding events and simply forwards all acl/sco
> data. What does it
> mean exactly?
If the hci emulator receives a connect request it translates this to
a connect indication event. If it receives a connect response it translates
this to a connect complete event with a fictive hci handle .
If it receives data it just forwards it.
Look in the code yourself, it is pretty straith forward (hci.c).
Finally, what does "using a unix socket on one
> computer" mean?
It is like a UDP/TCP socket but you use it locally to connect
two processes instead of two computers, in short... :)
Have a look on e.g http://www.ecst.csuchico.edu/~beej/guide/net/
> Thanks a lot.
> Tommaso Melodia
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