Re: Unable to read data via RFCOMM socket from a JSR82 program running on phone

Hi, 

Thank you very much. I attach my code here. 
rfcomm.c.tar.gz 
    Server and client code written in C language via RFCOMM socket. They
run in two linux machines with USB BT dongle. They communicate very well
as expected, described in first mail of this thread. 

MyBTMIDlet.java.tar.gz
     MIDlet making use of JSR82. It contains both server and client code
in one midlet. But in two phones, they can't communicate at all. Even
client can't find service registered by server. 

My goal is of making client of MyBTMIDlet running in phone communicate
well with bluez server running in linux machine. Currently client can
find service registered by bluez server and sends data to bluez server,
but linux machine doesn't get any string sent by client, as described by
first mail of this thread, attached again here for your convenience. 

Please help review the code. Thank you sooooooooooooooooo much.

Peter





David Rehle wrote:
> Peter,
> 
> which phone are you using? I know, that Siemens S65 (very old i know)
> can not establish a connection to bluez without pin request.
> 
> I did your job several times, so if you want, post your C and midp
> code, (only relevant connection code) i will have a look on it
> 
> kind regards
> 
> david
> 
> 
> 
> Zhu, Peter J schrieb:
>> Hi Vlad
>> 
>> Firstly thank you so much for giving this useful infomation. Yes, I
>> tested it between MIDlet running on phone and that MIDlet running on
>> desktop. Runs very well.  But that's between two JSR82 applications
>> rather than between a JSR82 and a C application utilizing bluez. Do
>> you have such case in hand so that I can test?  Thank you again.
>> 
>> Peter
>> 
>> Vlad Skarzhevskyy wrote:
>>> Hi Peter
>>>   We at bluecove.org constantly testing connections from JSR-82 on
>>> top of BlueZ on Linux to client on Mobile phone L2CAP or RFCOMM and
>>> back. No problems detected in BlueZ.
>>>   Make sure you are connecting to right service!
>>> 
>>>   Look at this application as test
>>> http://snapshot.bluecove.org/bluecove-examples/bluecove-tester/  it
>>> runs on Linux and the MIDLet version can be installed on the phone.
>>> 
>>> --
>>> Vlad
>> 
>>
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From: [email protected] on behalf of Zhu, Peter
J [[email protected]]
Sent: Tuesday, April 15, 2008 9:59 AM
To: [email protected]
Subject: [Bluez-users] Unable to read data via RFCOMM socket from a
JSR82program running on phone

Hi,

These days I tried to write one RFCOMM socket server that reads input
from a JSR82 client running on a phone but failed. My server program
runs on a Ubuntu gutsy distribution. This server registers a service
with a unique UUID and client looks for this service and send some
string request to server once found and then server sends back some
string data response to client. That's it. 

>From both log of JSR82 client and hcidump output in linux host, I can
see this service is successfully found and a successful connection is
setup between linux host and phone. This successful connection can also
be verified by both "hcitool con" and "l2ping". l2ping means L2CAP layer
communication is good, I think. The accept() of this server is
succesful, as well. But at same time,  read() with sockid returned by
accept() just blocks,  and hcidump output shows that no data is read
from low level host interface. 

Another info that might be useful is that I also wrote a bluez C client
with RFCOMM socket that does same thing as JSR82 client. The blueZ C
client runs in the other linux machine. The result is perfectly good,
with everything going very smooth as expected. Noticeably, this
linux-linux successful communication doesn't require any pin
input/pairing process. That's a bit strange. 

Any help or info is extremely appreciated. Thanks to bluez and linux and
all people here. 


-Peter


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