[Bluez-users] adding a sdp service with a 128bit uuid

[Bluez-users] adding a sdp service with a 128bit uuid

[Marco Trudel]

Hello everybody

by reading sdptool.c, I was able to write a little program that promotes my 
service. Realising this, 3 questions arised:

1. general:
how to browse the local sdp services?
[sdptool browse dev] seems to be only for remote devices. I now always did 
it from another device to see the local seervices. how to [sdptool browse 
localhost]?

2. from add_sp(...) in sdptool.c, changing:
  # sdp_uuid16_create(&sp_uuid, SERIAL_PORT_SVCLASS_ID);
into:
  # sdp_uuid128_create(&sp_uuid, a128bitUUID);
gives me (if I do [sdptool browse from the other device]):
  # Service Class ID List:
  #   "Error: This is uuid128" (0x0a333444-5556-6677-7888-9aa99000a1a1)
Actually it works well. But why is it saying "Error: ..."? I noticed that 
using the avetana jsr82 implementation (that uses bluez), and creating a 
sdp entry with a 128bit uuid, it shows the same error.

3. actually this is more a c then a bluez question, but i'd appreciate if 
someone could tell it nevertheless:
  # sdp_uuid32_create(uuid_t *uuid, uint32_t data);
  # sdp_uuid128_create(uuid_t *uuid, const void *data);
the second function takes the uuid as "const void *data". What is the 
appropriate way to give a uuid like 2c3ef0c843674369b1dfb7315e76332a to 
that function?
I asked google and he (she?) told me this:
http://www.xgarreau.org/aide/devel/bluetooth/timeserver.c
but it seems a little big for me...


regards
Marco


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Re: [Bluez-users] adding a sdp service with a 128bit uuid

[Marcel Holtmann]

Hi Marco,

> by reading sdptool.c, I was able to write a little program that promotes my 
> service. Realising this, 3 questions arised:
> 
> 1. general:
> how to browse the local sdp services?
> [sdptool browse dev] seems to be only for remote devices. I now always did 
> it from another device to see the local seervices. how to [sdptool browse 
> localhost]?

sdptool browse local

> 2. from add_sp(...) in sdptool.c, changing:
>   # sdp_uuid16_create(&sp_uuid, SERIAL_PORT_SVCLASS_ID);
> into:
>   # sdp_uuid128_create(&sp_uuid, a128bitUUID);
> gives me (if I do [sdptool browse from the other device]):
>   # Service Class ID List:
>   #   "Error: This is uuid128" (0x0a333444-5556-6677-7888-9aa99000a1a1)
> Actually it works well. But why is it saying "Error: ..."? I noticed that 
> using the avetana jsr82 implementation (that uses bluez), and creating a 
> sdp entry with a 128bit uuid, it shows the same error.

This is because the friend display (without --tree) don't understand
UUID 128 and don't knows how to translate it into a service.

> 3. actually this is more a c then a bluez question, but i'd appreciate if 
> someone could tell it nevertheless:
>   # sdp_uuid32_create(uuid_t *uuid, uint32_t data);
>   # sdp_uuid128_create(uuid_t *uuid, const void *data);
> the second function takes the uuid as "const void *data". What is the 
> appropriate way to give a uuid like 2c3ef0c843674369b1dfb7315e76332a to 
> that function?

Using "unsigned char uuid[16]" and then casting with "(void *)" worked
for me.

Regards

Marcel




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Re: [Bluez-users] adding a sdp service with a 128bit uuid

[Marco Trudel]

Marcel Holtmann wrote:
> Hi Marco,
> 
> 
>>by reading sdptool.c, I was able to write a little program that promotes my 
>>service. Realising this, 3 questions arised:
>>
>>1. general:
>>how to browse the local sdp services?
>>[sdptool browse dev] seems to be only for remote devices. I now always did 
>>it from another device to see the local seervices. how to [sdptool browse 
>>localhost]?
> 
> 
> sdptool browse local

nice :-)
maybe something that should/could be mentioned in the manpage or in --help

>>2. from add_sp(...) in sdptool.c, changing:
>>  # sdp_uuid16_create(&sp_uuid, SERIAL_PORT_SVCLASS_ID);
>>into:
>>  # sdp_uuid128_create(&sp_uuid, a128bitUUID);
>>gives me (if I do [sdptool browse from the other device]):
>>  # Service Class ID List:
>>  #   "Error: This is uuid128" (0x0a333444-5556-6677-7888-9aa99000a1a1)
>>Actually it works well. But why is it saying "Error: ..."? I noticed that 
>>using the avetana jsr82 implementation (that uses bluez), and creating a 
>>sdp entry with a 128bit uuid, it shows the same error.
> 
> 
> This is because the friend display (without --tree) don't understand
> UUID 128 and don't knows how to translate it into a service.

nice again. this solves my proglem that never existed :-)
maybee another thing to mention in the manpage...

>>3. actually this is more a c then a bluez question, but i'd appreciate if 
>>someone could tell it nevertheless:
>>  # sdp_uuid32_create(uuid_t *uuid, uint32_t data);
>>  # sdp_uuid128_create(uuid_t *uuid, const void *data);
>>the second function takes the uuid as "const void *data". What is the 
>>appropriate way to give a uuid like 2c3ef0c843674369b1dfb7315e76332a to 
>>that function?
> 
> 
> Using "unsigned char uuid[16]" and then casting with "(void *)" worked
> for me.

actually, i've a long representation of my uuid. but i'm willing to try!
using 0x233438787A233438787A233438787A23 as long uuid and an ascii table 
gives me: "#48xz#48xz#48xz#" for a char representation of the uuid and it 
works! :-)

but unfortunately that's an invented uuid to avoid control-chars. my uuid 
has values as 0x0F -> that's a SI (left shift) in the ascii table.
so i did:

unsigned char uuid[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
                          0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10 };

and it works as too. is this what you meant?


thanks a lot for the short and precise answers! it's always a pleasure!

regards
Marco


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Re: [Bluez-users] adding a sdp service with a 128bit uuid

[Marcel Holtmann]

Hi Marco,

> >>how to browse the local sdp services?
> >>[sdptool browse dev] seems to be only for remote devices. I now always did 
> >>it from another device to see the local seervices. how to [sdptool browse 
> >>localhost]?
> > 
> > 
> > sdptool browse local
> 
> nice :-)
> maybe something that should/could be mentioned in the manpage or in --help

feel free to send in a patch.

> >>from add_sp(...) in sdptool.c, changing:
> >>  # sdp_uuid16_create(&sp_uuid, SERIAL_PORT_SVCLASS_ID);
> >>into:
> >>  # sdp_uuid128_create(&sp_uuid, a128bitUUID);
> >>gives me (if I do [sdptool browse from the other device]):
> >>  # Service Class ID List:
> >>  #   "Error: This is uuid128" (0x0a333444-5556-6677-7888-9aa99000a1a1)
> >>Actually it works well. But why is it saying "Error: ..."? I noticed that 
> >>using the avetana jsr82 implementation (that uses bluez), and creating a 
> >>sdp entry with a 128bit uuid, it shows the same error.
> > 
> > 
> > This is because the friend display (without --tree) don't understand
> > UUID 128 and don't knows how to translate it into a service.
> 
> nice again. this solves my proglem that never existed :-)
> maybee another thing to mention in the manpage...

Again, any updates of the manual pages are always welcome.

> >>actually this is more a c then a bluez question, but i'd appreciate if 
> >>someone could tell it nevertheless:
> >>  # sdp_uuid32_create(uuid_t *uuid, uint32_t data);
> >>  # sdp_uuid128_create(uuid_t *uuid, const void *data);
> >>the second function takes the uuid as "const void *data". What is the 
> >>appropriate way to give a uuid like 2c3ef0c843674369b1dfb7315e76332a to 
> >>that function?
> > 
> > 
> > Using "unsigned char uuid[16]" and then casting with "(void *)" worked
> > for me.
> 
> actually, i've a long representation of my uuid. but i'm willing to try!
> using 0x233438787A233438787A233438787A23 as long uuid and an ascii table 
> gives me: "#48xz#48xz#48xz#" for a char representation of the uuid and it 
> works! :-)
> 
> but unfortunately that's an invented uuid to avoid control-chars. my uuid 
> has values as 0x0F -> that's a SI (left shift) in the ascii table.
> so i did:
> 
> unsigned char uuid[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
>                           0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10 };
> 
> and it works as too. is this what you meant?

It is exactly how I create UUID 128 if needed. If you play with long
types then you may ran into compiler or platform problems. The unsigned
character array is supposed to work everywhere.

> thanks a lot for the short and precise answers! it's always a pleasure!

You are welcome.

Regards

Marcel




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Re: [Bluez-users] adding a sdp service with a 128bit uuid

[Taneli Vähäkangas]

[-- Attachment #1: Type: text/plain, Size: 564 bytes --]

On Sat, 2005-03-05 at 14:38 +0100, Marcel Holtmann wrote:
> Hi Marco,
> 
> > >>how to browse the local sdp services?
> > >>[sdptool browse dev] seems to be only for remote devices. I now always did 
> > >>it from another device to see the local seervices. how to [sdptool browse 
> > >>localhost]?
> > > 
> > > 
> > > sdptool browse local
> > 
> > nice :-)
> > maybe something that should/could be mentioned in the manpage or in --help
> 
> feel free to send in a patch.

What do you think about this? It adds the "sdptool browse local" to the
examples.

	Taneli


[-- Attachment #2: sdptool.1-patch --]
[-- Type: text/x-patch, Size: 396 bytes --]

diff -Nabpur bluez-utils-2.15/tools/sdptool.1 bluez-utils-2.15b/tools/sdptool.1
--- bluez-utils-2.15/tools/sdptool.1	2004-03-31 23:14:52.000000000 +0300
+++ bluez-utils-2.15b/tools/sdptool.1	2005-03-06 10:04:44.000000000 +0200
@@ -99,6 +99,8 @@ Displays help on using sdptool. 
 .PP 
 sdptool browse 00:80:98:24:15:6D 
 .PP 
+sdptool browse local 
+.PP 
 sdptool add DUN 
 .PP 
 sdptool del LAN 

Re: [Bluez-users] adding a sdp service with a 128bit uuid

[Marcel Holtmann]

Hi Taneli,

> > > >>how to browse the local sdp services?
> > > >>[sdptool browse dev] seems to be only for remote devices. I now always did 
> > > >>it from another device to see the local seervices. how to [sdptool browse 
> > > >>localhost]?
> > > > 
> > > > 
> > > > sdptool browse local
> > > 
> > > nice :-)
> > > maybe something that should/could be mentioned in the manpage or in --help
> > 
> > feel free to send in a patch.
> 
> What do you think about this? It adds the "sdptool browse local" to the
> examples.

applied. Thanks.

Regards

Marcel




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Re: [Bluez-users] adding a sdp service with a 128bit uuid

[Ka Kin Cheung]

[-- Attachment #1: Type: text/plain, Size: 2224 bytes --]

Hi Marco!
    Can you send the program you wrote to me for reference? Or can you tell briefly the algorithm about the program you wrote about adding a service profile, especially for which functions in sdptool.c are nneded? Thank you very much.
Michael

Marco Trudel <mtrudel@gmx.ch> wrote:
Hello everybody

by reading sdptool.c, I was able to write a little program that promotes my 
service. Realising this, 3 questions arised:

1. general:
how to browse the local sdp services?
[sdptool browse dev] seems to be only for remote devices. I now always did 
it from another device to see the local seervices. how to [sdptool browse 
localhost]?

2. from add_sp(...) in sdptool.c, changing:
# sdp_uuid16_create(&sp_uuid, SERIAL_PORT_SVCLASS_ID);
into:
# sdp_uuid128_create(&sp_uuid, a128bitUUID);
gives me (if I do [sdptool browse from the other device]):
# Service Class ID List:
# "Error: This is uuid128" (0x0a333444-5556-6677-7888-9aa99000a1a1)
Actually it works well. But why is it saying "Error: ..."? I noticed that 
using the avetana jsr82 implementation (that uses bluez), and creating a 
sdp entry with a 128bit uuid, it shows the same error.

3. actually this is more a c then a bluez question, but i'd appreciate if 
someone could tell it nevertheless:
# sdp_uuid32_create(uuid_t *uuid, uint32_t data);
# sdp_uuid128_create(uuid_t *uuid, const void *data);
the second function takes the uuid as "const void *data". What is the 
appropriate way to give a uuid like 2c3ef0c843674369b1dfb7315e76332a to 
that function?
I asked google and he (she?) told me this:
http://www.xgarreau.org/aide/devel/bluetooth/timeserver.c
but it seems a little big for me...


regards
Marco


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Re: [Bluez-users] adding a sdp service with a 128bit uuid

[Marco Trudel]

Hallo Michael

just read the sdptool.c... it's all there. basically you need
add_sp(sdp_session_t *session, svc_info_t *si)

respectively you told once something about headset, i think... there is a
method like add_headset()...

regards
Marco


Ka Kin Cheung wrote:
> Hi Marco!
>     Can you send the program you wrote to me for reference? Or can you 
> tell briefly the algorithm about the program you wrote about adding a 
> service profile, especially for which functions in sdptool.c are nneded? 
> Thank you very much.
> Michael
> 
> */Marco Trudel <mtrudel@gmx.ch>/* wrote:
> 
>     Hello everybody
> 
>     by reading sdptool.c, I was able to write a little program that
>     promotes my
>     service. Realising this, 3 questions arised:
> 
>     1. general:
>     how to browse the local sdp services?
>     [sdptool browse dev] seems to be only for remote devices. I now
>     always did
>     it from another device to see the local seervices. how to [sdptool
>     browse
>     localhost]?
> 
>     2. from add_sp(...) in sdptool.c, changing:
>     # sdp_uuid16_create(&sp_uuid, SERIAL_PORT_SVCLASS_ID);
>     into:
>     # sdp_uuid128_create(&sp_uuid, a128bitUUID);
>     gives me (if I do [sdptool browse from the other device]):
>     # Service Class ID List:
>     # "Error: This is uuid128" (0x0a333444-5556-6677-7888-9aa99000a1a1)
>     Actually it works well. But why is it saying "Error: ..."? I noticed
>     that
>     using the avetana jsr82 implementation (that uses bluez), and
>     creating a
>     sdp entry with a 128bit uuid, it shows the same error.
> 
>     3. actually this is more a c then a bluez question, but i'd
>     appreciate if
>     someone could tell it nevertheless:
>     # sdp_uuid32_create(uuid_t *uuid, uint32_t data);
>     # sdp_uuid128_create(uuid_t *uuid, const void *data);
>     the second function takes the uuid as "const void *data". What is the
>     appropriate way to give a uuid like 2c3ef0c843674369b1dfb7315e76332a to
>     that function?
>     I asked google and he (she?) told me this:
>     http://www.xgarreau.org/aide/devel/bluetooth/timeserver.c
>     but it seems a little big for me...
> 
> 
>     regards
>     Marco
> 
> 
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>     SF email is sponsored by - The IT Product Guide
>     Read honest & candid reviews on hundreds of IT Products from real users.
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Re: [Bluez-users] adding a sdp service with a 128bit uuid

[Xavier Garreau]

>     3. actually this is more a c then a bluez question, but i'd
>     appreciate if
>     someone could tell it nevertheless:
>     # sdp_uuid32_create(uuid_t *uuid, uint32_t data);
>     # sdp_uuid128_create(uuid_t *uuid, const void *data);
>     the second function takes the uuid as "const void *data". What is the
>     appropriate way to give a uuid like 2c3ef0c843674369b1dfb7315e76332a to
>     that function?
>     I asked google and he (she?) told me this:
>     http://www.xgarreau.org/aide/devel/bluetooth/timeserver.c
>     but it seems a little big for me...

Whaou, nice, i love google :)

Actually i wrote this sample for a presentation in a university. It's 
not production quality code.

But to give data as void* you can do something like this:

unsigned char uuid_data[16] = {0x2c, 0x3e, 0xf0, 0xc8, 0x43, 0x67, 0x43, 
0x69, 0xb1, 0xdf, 0xb7, 0x31, 0x5e, 0x76, 0x33, 0x2a};
...
sdp_uuid128_create (&uuid, (void*)uuid_data);

Actually, in the code you mentionned i used the create_base_uuid 
function from a bluez source ... But i don't remember from what file it 
was ...

Regards,
Xavier


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