[Bluez-users] Re: How to emulate slave serial ports ?

[Davide Rizzo <rizzo@eidosspa.it>]

Marcel Holtmann <marcel <at> holtmann.org> writes:

> 
> Hi Davide,
> 
> > On the linux machine now I have a program that opens the serial device (and
> > keeps it opened), periodically polls it for incoming requests, and eventually
> > responds to the requests.
> 
> I don't understand this. Show me that program.
> 
> > I wish to substitute this physical RS232 line with a bluetooth connection,
> > without changing the Windows software on the PC (and the software on the
> > target), except for the device names. Is it possible ?
> 
> It is possible, but I still don't know what you really wanna do. Replace
> some serial port is not a detailed description.
> 
> > Which bluez tools should I run on the init script ?
> 
> Besides hcid and sdpd, nothing more. But you must write a program that
> accepts connections on RFCOMM and that also registers a service record
> for your serial port.
> 
> Regards
> 
> Marcel
> 
> 
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Hi Marcel,

Let me start from the outside.

The final result I want to obtain is:

>From a PC running Windows (master):
1) I scan the bluetooth devices, and find one (or more) my linux devices
2) I pair the device with the correct PIN code
3) I browse the device's services and find one communication ports
4) I establish a Link with that comm port to a Windows virtual COMx port
5) I use the connected COMx port like any other "true" COMx port, sending
inquiries and reading results in a proprietary format.
Until now I succeeded in points 1) and 2)

>From the target running linux 2.6.9 on an ARM9 (slave):
1) I run hciconfig
2) I start hcid
3) I start sdpd
4) My application opens /dev/rfcomm0 and keeps it opened
5) My application polls with read() on /dev/rfcomm0 for incoming messages

Question 1:
Is necessary to have on the target my application running with /dev/rfcomm0
opened for the Windows PC to look at the exported serial port ?

Question 2:
I setted up /usr/local/etc/bluetooth/pin and /usr/local/etc/bluetooth/hcid.conf
for hcid, and it works OK. Does sdpd needs any configuration file ? Where is
stored the sdpd configuration ? Where is stored the fact that I want to export
one virtual serial port ?

Question 3:
If I run sdpd without any flags, it doesn't fork() because getppid()==1. Why ?
Which is the correct mode of starting sdpd like a daemon ?

Thanks

Davide



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