Hello,

I'm using BlueZ 3.9 and the DBus API from a custom application to 
extract the SDP records from a phone. To achieve this, I first perform a 
call to

array{uint32} GetRemoteServiceHandles(string address, string match)

with an empty "match" string. It does connect to Public Browse Group,
and returns handles for all the ServiceRecords. I then perform a call

array{byte} GetRemoteServiceRecord(string address, uint32 handle)

for each of these handles, and I get all the data in binary form, and I 
  deal with them myself in this form.

Problem is that I sometimes encounter very long delays to extract a 
record using its handle. Here is a summary of an example session (device 
was disconnected because of a timeout at higher level). Relevant portion 
of hcidump -XV output is attached.

09:53:19,339  Connection established (ACL link)
09:53:19,541  We got all the 6 handles (took 202ms)
09:53:19,841  Request for record on handle 0x0 sent
09:53:23,591  Record received (took 4050 ms)
09:53:23,841  Request for record on handle 0x10000 sent
09:53:33,886  Record received (took 10045 ms)
09:53:34,091  Request for record on handle 0x10001 sent
09:53:39,016  Record received (took 4925 ms)
09:53:39,340  Request for record on handle 0x10003 sent
09:53:44,186  Record received (took 4846 ms)
09:53:44,302  Request for record on handle 0x10005 sent
09:53:44,357  Record received (took 55ms)
09:53:44,591  Request for record on handle 0x10006 sent
09:53:44,775  Record received (took 184ms)
09:53:44,863  Request for record on handle 0x10007 sent
09:53:45,660  Connection disconnected due to my app

In this example (which is only a sample), we can see that time to 
extract a record is varying between 55 and 10045ms, which is quite a 
huge amount!

Is this kind of delay normal, and to be expected, or is something going 
wrong here? What strikes me is that as a test, I performed a full SDP 
extraction using another symbian phone using btdiscovery.sis, and it 
completed much faster than what I had just experienced with bluez. Right 
after that, I then re-tried from bluez, and again it was very slow.


Thanks in advance,
Best Regards.

Pierre-Yves Paulus