Re: [Bluez-users] rfcomm question 3

[Alain Volmat <avolmat@src.ricoh.co.jp>]

Hi Michael,

> So I wish to know which one is about socket based programming?
The one using socket :D
By saying so, you can already remove the first one. It is only for
handling Bluetooth address, as the comment says.

The second function is about connection, not listening.
I haven't found the 3rd function you mention about, or maybe I just
misread your email ... reading source code without indentation is not
that simple.

Basically RFCOMM socket programming is just very standard socket programm=
ing.
in very short, to start listening,
	socket
	bind (specifying RFCOMM port)
	setsockopt (for MTU ... I guess)
	listen
	accept
	..

Alain







* Ka Kin Cheung [Wed,  2 Feb 2005 at 10:49 +0800]
<quote>
> Hi Marcel,
>     I've found one powerpoint you made about Bluetooth programming on L=
inux in Wireless Technologies Congress 2003. But I don't know for those t=
hree programs you put, which one is describing about the PC listening the=
 mobile in RFCOMM channel. Let me put here.
> For Handling of Bluetooth device addresses
> #include <bluetooth/bluetooth.h>
> void main(int argc, char *argv[])
> {
> bdaddr_t bdaddr;
> char *str, addr[18];
> str2ba("00:a5:b4:c3:d2:e1", &bdaddr);
> ba2str(&bdaddr, addr);
> str =3D batostr(&bdaddr);
> printf("%s %s\n", addr, str);
> free(str);
> bacpy(&bdaddr, BDADDR_ANY);
> }
>=20
> For definition of the socket data types
> static int rfcomm_connect(bdaddr_t *src, bdaddr_t *dst, uint8_t channel=
)
> {
> struct sockaddr_rc addr;
> int sk;
> if ((sk =3D socket(PF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM)) < 0)
> return -1;
> addr.rc_family =3D AF_BLUETOOTH;
> bacpy(&addr.rc_bdaddr, src);
> addr.rc_channel =3D 0;
> if (bind(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
> close(sk);
> return -1;
> }
> addr.rc_family =3D AF_BLUETOOTH;
> bacpy(&addr.rc_bdaddr, dst);
> addr.rc_channel =3D channel;
> if (connect(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
> close(sk);
> return -1;
> }
> So I wish to know which one is about socket based programming? Thanks a=
 lot!
> Michael
>=20
> Marcel Holtmann <marcel@holtmann.org> wrote:
> Hi Michael,
>=20
> > I thank Marcel here for help on initializing
> > connection from mobile to PC. Now, before I can do
> > that, I initialize the rfcomm connection from PC to
> > mobile, and then run my project program. The syntax is
> > as follows:
> > snprintf (tmp, sizeof (tmp), "t68_remote_v2 (%s)",
> > modemname);
> > tmp[sizeof (tmp) - 1] =3D 0;
> > openlogfile (tmp, logfile, LOG_DAEMON, loglevel);
> > set_alarmhandler (alarmhandler, alarmlevel,
> > modemname);
> > openmodem ();
> > setmodemparams ();
> > But now, when I initialize the connection from mobile
> > to PC, once I run the program, "/dev/rfcomm0: No such
> > device" is shown. So, I wish to know how can I modify
> > the program by changing some syntax from that I post
> > here? Or is there any program that I can include in my
> > main program? Thank you very much.
>=20
> if you wanna connect from a mobile phone to a machine running BlueZ you
> need to write an application that listens on a RFCOMM channel. This is
> about socket programming and you convert this socket later in to a TTY
> with a /dev/rfcommX device node, but actually unless you have some
> legacy application like pppd this should not be needed. What you need i=
s
> to do direct socket programming. It is as easy as using a TTY and I
> posted detailed information about how to change a TTY based program int=
o
> a socket based program years ago. Check the mailing list archive.
>=20
> Regards
>=20
> Marcel
>=20
>=20
>=20
>=20
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>=20
>=20
>=20
> ---------------------------------
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</quote>


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