Re: serial over bluetooth question

Pav Lucistnik wrote:
> two questions:
> 
> 1, how can i open serial connection to remote bluetooth device and how
> to use such connection (terminal, gnokii, pilot-link ...)

assuming you mean RFCOMM :) to open RFCOMM connection:

s = socket(AF_BLUETOOTH, BLUETOOTH_PROTO_RFCOMM);

local.rfcomm_len = sizeof(local);
local.rfcomm_family = AF_BLUETOOTH
memcpy(&local.rfcomm_bdaddr, NG_HCI_BDADDR_ANY, sizeof(bdaddr_t));
local.rfcomm_channel = 0;
bind(s, (struct sockaddr *) &local, sizeof(local));

remote.rfcomm_len = sizeof(remote);
remote.rfcomm_family = AF_BLUETOOTH;
memcpy(&remote.rfcomm_bdaddr, <remote_BD_ADDR>, sizeof(bdaddr_t));
remote.rfcomm_channel = <remote_RFCOMM_channel>;
connect(s, (struct sockaddr *) &remote, sizeof(remote));

now <s> is connected to via RFCOMM to the serial port on the
other side :) just to read(2)/write(2) to send/receive data.

check the sources for rfcomm_pppd(8). what it does is

1) open RFCOMM connection (socket)
2) fork()s
3) redirects RFCOMM socket to stdin/stdout
4) executes PPP in -direct mode (i.e. PPP uses stdin/stdout)

if gnokii, pilot-link etc. support "-direct" mode (i.e. they
can use stdin/stdout) then you simply repeat steps 1-3 above
and execute gnokii, pilot-link etc. in step 4.

if not then you can use nmdm(4) driver. connect master side
to the RFCOMM socket and use slave side in gnokii, pilot-link etc.

> 2, what is hcseriald good for?

hcseriald(8) is for supervising serial (i.e. UART-based) Bluetooth
devices. such Bluetooth devices (for example Xircom CBT card)
are recognized as serial ports (modems) by sio(4) driver. hcseriald(8)
opens /dev/cuaa### and pushes H4 line discipline thus coverting
serial device into Netgraph node.

thanks,
max


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