<s>
OBEX	B-General_Concept
(	O
abbreviation	O
of	O
OBject	B-General_Concept
EXchange	I-General_Concept
,	O
also	O
termed	O
IrOBEX	B-General_Concept
)	O
is	O
a	O
communications	O
protocol	O
that	O
facilitates	O
the	O
exchange	O
of	O
binary	O
objects	O
between	O
devices	O
.	O
</s>
<s>
It	O
is	O
maintained	O
by	O
the	O
Infrared	O
Data	O
Association	O
but	O
has	O
also	O
been	O
adopted	O
by	O
the	O
Bluetooth	B-Protocol
Special	O
Interest	O
Group	O
and	O
the	O
SyncML	B-General_Concept
wing	O
of	O
the	O
Open	O
Mobile	O
Alliance	O
(	O
OMA	O
)	O
.	O
</s>
<s>
One	O
of	O
OBEX	B-General_Concept
's	O
earliest	O
popular	O
applications	O
was	O
in	O
the	O
Palm	B-Application
III	I-Application
.	O
</s>
<s>
This	O
PDA	B-Application
and	O
its	O
many	O
successors	O
use	O
OBEX	B-General_Concept
to	O
exchange	O
business	O
cards	O
,	O
data	O
,	O
even	O
applications	O
.	O
</s>
<s>
Although	O
OBEX	B-General_Concept
was	O
initially	O
designed	O
for	O
infrared	O
,	O
it	O
has	O
now	O
been	O
adopted	O
by	O
Bluetooth	B-Protocol
,	O
and	O
is	O
also	O
used	O
over	O
RS-232	O
,	O
USB	B-Protocol
,	O
WAP	B-Protocol
and	O
in	O
devices	O
such	O
as	O
Livescribe	O
smartpens	O
.	O
</s>
<s>
OBEX	B-General_Concept
is	O
similar	O
in	O
design	O
and	O
function	O
to	O
HTTP	B-Protocol
in	O
providing	O
the	O
client	O
with	O
a	O
reliable	O
transport	O
for	O
connecting	O
to	O
a	O
server	O
and	O
may	O
then	O
request	O
or	O
provide	O
objects	O
.	O
</s>
<s>
But	O
OBEX	B-General_Concept
differs	O
in	O
many	O
important	O
respects	O
:	O
</s>
<s>
HTTP	B-Protocol
is	O
normally	O
layered	O
above	O
a	O
TCP/IP	B-Protocol
link	O
.	O
</s>
<s>
OBEX	B-General_Concept
can	O
also	O
be	O
,	O
but	O
is	O
commonly	O
implemented	O
on	O
an	O
IrLAP/IrLMP/Tiny	O
TP	O
stack	O
on	O
an	O
IrDA	O
device	O
.	O
</s>
<s>
In	O
Bluetooth	B-Protocol
,	O
OBEX	B-General_Concept
is	O
implemented	O
on	O
a	O
Baseband/ACL/L2CAP	O
(	O
and	O
,	O
for	O
legacy	O
uses	O
,	O
RFCOMM	O
)	O
stack	O
.	O
</s>
<s>
Other	O
such	O
"	O
bindings	O
"	O
of	O
OBEX	B-General_Concept
are	O
possible	O
,	O
such	O
as	O
over	O
USB	B-Protocol
.	O
</s>
<s>
HTTP	B-Protocol
uses	O
human-readable	O
text	O
,	O
but	O
OBEX	B-General_Concept
uses	O
binary-formatted	O
type	B-Protocol
–	I-Protocol
length	I-Protocol
–	I-Protocol
value	I-Protocol
triplets	O
named	O
"	O
Headers	O
"	O
to	O
exchange	O
information	O
about	O
a	O
request	O
or	O
an	O
object	O
.	O
</s>
<s>
HTTP	B-Protocol
transactions	O
are	O
inherently	O
stateless	O
;	O
generally	O
an	O
HTTP	B-Protocol
client	O
opens	O
a	O
connection	O
,	O
makes	O
a	O
single	O
request	O
,	O
receives	O
its	O
response	O
,	O
and	O
either	O
closes	O
the	O
connection	O
or	O
makes	B-Protocol
other	I-Protocol
unrelated	I-Protocol
requests	I-Protocol
.	O
</s>
<s>
In	O
OBEX	B-General_Concept
,	O
a	O
single	O
transport	O
connection	O
may	O
bear	O
many	O
related	O
operations	O
.	O
</s>
<s>
In	O
fact	O
,	O
recent	O
additions	O
to	O
the	O
OBEX	B-General_Concept
specification	O
allow	O
an	O
abruptly	O
closed	O
transaction	O
to	O
be	O
resumed	O
with	O
all	O
state	O
information	O
intact	O
.	O
</s>
<s>
OBEX	B-General_Concept
works	O
by	O
exchanging	O
objects	O
,	O
which	O
are	O
used	O
for	O
a	O
variety	O
of	O
purposes	O
:	O
establishing	O
the	O
parameters	O
of	O
a	O
connection	O
,	O
sending	O
and	O
requesting	O
data	O
,	O
changing	O
the	O
current	O
path	O
or	O
the	O
attributes	O
of	O
a	O
file	O
.	O
</s>
<s>
For	O
example	O
,	O
SyncML	B-General_Concept
does	O
not	O
use	O
SETPATH	O
,	O
while	O
an	O
OBEX	B-General_Concept
push	O
is	O
made	O
of	O
just	O
CONNECT	O
(	O
without	O
a	O
TARGET	O
header	O
)	O
,	O
PUT	O
and	O
an	O
optional	O
DISCONNECT	O
.	O
</s>
<s>
The	O
following	O
protocols	O
runs	O
over	O
OBEX	B-General_Concept
,	O
or	O
have	O
bindings	O
to	O
do	O
so	O
:	O
</s>
<s>
Stores	O
and	O
retrieves	O
files	O
,	O
similar	O
to	O
FTP	B-Protocol
.	O
</s>
<s>
SyncML	B-General_Concept
can	O
synchronize	O
phonebooks	O
,	O
calendars	O
,	O
notes	O
,	O
and	O
other	O
data	O
.	O
</s>
<s>
In	O
its	O
OBEX	B-General_Concept
binding	O
,	O
the	O
target	O
of	O
the	O
CONNECT	O
object	O
is	O
{	O
 '	O
S	O
 '	O
,	O
'	O
Y	O
 '	O
,	O
'	O
N	O
 '	O
,	O
'	O
C	B-Language
 '	O
,	O
'	O
M	O
 '	O
,	O
'	O
L	O
 '	O
,	O
'	O
-	O
'	O
,	O
'	O
S	O
 '	O
,	O
'	O
Y	O
 '	O
,	O
'	O
N	O
 '	O
,	O
'	O
C'}	O
;	O
a	O
session	O
then	O
consists	O
in	O
a	O
sequence	O
of	O
PUT-GET	O
pairs	O
where	O
nameless	O
XML	B-Protocol
or	O
WBXML	B-Protocol
files	O
are	O
sent	O
and	O
received	O
,	O
in	O
turn	O
.	O
</s>
<s>
Optional	O
package	O
javax.obex	O
in	O
Java	B-Language
APIs	I-Language
for	I-Language
Bluetooth	I-Language
provides	O
an	O
implementation	O
of	O
OBEX	B-General_Concept
in	O
Java	B-Language
.	O
</s>
<s>
OpenObex	O
is	O
an	O
open-source	O
implementation	O
of	O
OBEX	B-General_Concept
in	O
C	B-Language
.	O
It	O
provides	O
functions	O
for	O
connecting	O
over	O
IrDA	O
,	O
Bluetooth	B-Protocol
,	O
USB	B-Protocol
and	O
TCP/IP	B-Protocol
,	O
building	O
objects	O
and	O
handling	O
received	O
data	O
.	O
</s>
<s>
PyOBEX	O
provides	O
partial	O
support	O
for	O
OBEX	B-General_Concept
in	O
Python	B-Language
.	O
</s>
<s>
nOBEX	O
is	O
a	O
fork	O
of	O
PyOBEX	O
with	O
more	O
complete	O
OBEX	B-General_Concept
support	O
,	O
and	O
support	O
for	O
the	O
Bluetooth	B-Protocol
Hands	O
Free	O
Profile	O
to	O
facilitate	O
OBEX	B-General_Concept
testing	O
on	O
automotive	O
infotainment	O
systems	O
.	O
</s>
<s>
OBEX	B-General_Concept
is	O
the	O
foundation	O
for	O
many	O
higher-layer	O
"	O
profiles	O
"	O
:	O
</s>
<s>
All	O
Palms	O
since	O
Palm	B-Application
III	I-Application
,	O
except	O
the	O
Palm	B-Application
Pre	O
,	O
Palm	B-Application
Pre	O
Plus	O
,	O
Palm	B-Application
Pixi	O
and	O
Palm	B-Application
Pixi	O
Plus	O
.	O
</s>
<s>
Windows	O
Phone	O
7.8	O
and	O
8	O
devices	O
(	O
limited	O
to	O
the	O
transferring	O
of	O
pictures	O
,	O
music	O
and	O
videos	O
via	O
a	O
'	O
Bluetooth	B-Protocol
Share	O
 '	O
app	O
)	O
.	O
</s>
