Hi,

>> I am experiencing problems getting SDP information from some new 
>> Motorola phones (I am dealing with E770). Running "sdptool browse 
>> BDADDR", I get the attached hcidump. As it can be seen, after the SDP 
>> SSA request, the mobile phone does not respond any data and after 20 
>> seconds (the SDP timeout compiled in bluez-libs), sdptool issues an ACL 
>> disconnect. During this time, the phone freezes completely. If I want to 
>> get a specific service (say, OBEX), there are no problems.
>>
>>  From my understanding, the problem is that the Motorola phone does not 
>> deal correctly with the SDP query issued by bluez. I have been trying to 
>> debug sdptool and comparing to other implementations (Symbian seems to 
>> work OK with Motorola) but, as Marcel says, SDP is a horrible protocol.
>>
>> Has anybody experienced any similar problem?
> 
> this problem also exists on the RARZ V3x and I called it ByeByeMoto,
> because it stalls my complete phone. There can't be an easy workaround.
> It is a really serious bug from Motorola and they should provide free
> software upgrades to anyone. However I have no idea how they passed the
> Bluetooth qualification with these devices.

I have been trying to understand what is happening, in order to find a
workaround. I do not know what are the internal structures of the SDP
protocol and I could not follow sdp_service_search_attr_req().

In any case, I have seen that the SDP query created by Symbian works
perfectly on these Motorola phones. I have attached the hcidump's (raw
and decoded), if they could be of any use. The most important difference
is the SDP SSA packet.

Bluez:
< ACL data: handle 41 flags 0x02 dlen 24
      L2CAP(d): cid 0x0040 len 20 [psm 1]
          SDP SSA Req: tid 0x0 len 0xf
            pat uuid-16 0x1002 (PubBrwsGrp)
            max 65535
            aid(s) 0x0000 - 0xffff
            cont 00

Symbian:
  > ACL data: handle 41 flags 0x02 dlen 17
      L2CAP(d): cid 0x0040 len 13 [psm 1]
          SDP SS Req: tid 0x1 len 0x8
            pat uuid-16 0x1002 (PubBrwsGrp)
            max 65535
            cont 00

As it can be seen, tid and len are different and aid(s) is only in Bluez.

I hope that this can be useful.

Cheers,

Pedro