Re: [Bluez-users] RFCOMM Connect problem, need help to understand HCIDUMP output

[Marcel Holtmann <marcel@holtmann.org>]

Hi Magnus,

> Can someone help me to describe what the HCIDUMP in the end of this message 
> says is wrong?
> 
> Does anyone have a URL to some doc that explain the HCIDUMP output?

install the latest hcidump and use the options "-X -V" which give you a
better hex/ASCII dump and the verbose decoding.

> I think the following part is of interest (see below for the full hcidump - 
> output):
> 
> > ACL data: handle 0x002e flags 0x02 dlen 8
>     L2CAP(d): cid 0x0040 len 4 [psm 3]
>       RFCOMM(s): DM: cr 1 dlci 2 pf 1 ilen 0 fcs 0x73
> < ACL data: handle 0x002e flags 0x02 dlen 8
>     L2CAP(d): cid 0x0048 len 4 [psm 3]
>       RFCOMM(s): DISC: cr 1 dlci 0 pf 1 ilen 0 fcs 0xfd


The more important one is the data packet before it. It tells you for
what command the DM is send:

< ACL data: handle 0x002e flags 0x02 dlen 8
    L2CAP(d): cid 0x004a len 4 [psm 3]
      RFCOMM(s): SABM: cr 1 dlci 2 pf 1 ilen 0 fcs 0x59

This means that you tried to open RFCOMM channel 1 and with the DM the
phone tells you that it won't create it. So you better check your phone
why it is not accepting a connection on this channel.

The DISC is not for channel 1 (DLCI 2). It is for DLCI 0 which is the
signal channel.

Regards

Marcel




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