Re: [Bluez-devel] rfcomm socket and rfcomm tty

[mike <mikelee@avantwave.com>]

Dear Marcel
    Thanks for explain.

    Actually, i have tried to connect to Window base computer and test 
with hyperterminal . my program does success in connection and send out 
data. But when i try to connect to rfcomm listen in another computer, it 
comes out a oops. and then my usb dongle halt and need a OS reboot.
    Do you have any idea on below oops? Thanks for helping

------------[ cut here ]------------
kernel BUG at include/linux/module.h:325!
invalid operand: 0000 [#1]
CPU:    0
EIP:    0060:[<129d25e1>]    Not tainted
EFLAGS: 00010246   (2.6.5-1.358)
EIP is at rfcomm_session_add+0x73/0x88 [rfcomm]
eax: 00000000   ebx: 0e63a984   ecx: 00000000   edx: 11ee5400
esi: 00000002   edi: 0e63a9b0   ebp: 0bda8080   esp: 0e283fa4
ds: 007b   es: 007b   ss: 0068
Process krfcommd (pid: 1835, threadinfo=0e283000 task=10ee39b0)
Stack: 128daba0 0bda8080 0a7e1800 0397c91c 129d3b29 029d91a8 129d84f0 
00000000
       0e283000 00000000 0e283fde 00000000 129d3f49 00000000 00000000 
0000007b
       0000007b 129d3ef1 00000000 021041d9 00000000 00000000 00000000
Call Trace:
 [<129d3b29>] rfcomm_worker+0x10b/0x3a6 [rfcomm]
 [<129d3f49>] rfcomm_run+0x58/0x6b [rfcomm]
 [<129d3ef1>] rfcomm_run+0x0/0x6b [rfcomm]
 [<021041d9>] kernel_thread_helper+0x5/0xb
 
Code: 0f 0b 45 01 ff 5f 9d 12 ff 05 00 89 9d 12 89 d8 5b 5e 5f 5d

best regard
Mike,Lee


Marcel Holtmann wrote:

>Hi Mike,
>
>  
>
>>    Is it mean that rfcomm socket can not connect to a rfcomm tty?
>>    If the answer is yes, Does it mean that all program base on bluez 
>>should use rfcomm tty to connect to bluetooth Serial Port profile?
>>    
>>
>
>you can use RFCOMM socket or RFCOMM TTY to connect to the serial port
>profile. Nothing matters and actually you can convert a socket into a
>TTY if it is needed later. However if you don't need a TTY for legacy
>reasons then always use the RFCOMM socket, because this will be much
>cleaner and easier.
>
>Regards
>
>Marcel
>
>
>
>
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