Thanks Szymon that is the limitation I was suspecting about. After having a quick look to the btd_* functions, it looks to be unlikely I can register a GATT server service with an external plugin. On 2 March 2016 at 14:34, Szymon Janc <ext.szymon.janc@xxxxxxxxx> wrote: > Hi, > > On Wednesday 02 of March 2016 16:18:22 Luiz Augusto von Dentz wrote: >> Hi Olivier, >> >> On Wed, Mar 2, 2016 at 3:20 PM, Olivier Martin >> >> <olivier.martin.fr@xxxxxxxxx> wrote: >> > Hello all, >> > I am looking at writing a new GATT (server) service for my Linux-based >> > bluetooth device using Bluez. >> > My device use Debian stable (Jessie) that uses Bluez v5.23. >> > Ideally, I would like to build my GATT service out of the Bluez tree. >> > As far as I understand I have two solutions: >> > >> > Solution A) Stay with Bluez v5.23 and write a plugin. I managed to >> > build `plugins/gatt-example.c` out of the tree. But when `bluetoothd` >> > loads the plugin, it fails to find the symbol `attrib_db_update`. I am >> > wondering if it is due to the fact `shared/gatt-server` has not been >> > added to v5.23 >> > (https://git.kernel.org/cgit/bluetooth/bluez.git/tree/src/shared?h=5.23). >> > And in this case it would not be possible to have a GATT service out of >> > the tree for this Bluez version. >> >> It depends on the level of control you want to have, if you need extra >> permissions and low level of access than perhaps building as a plugin >> is probably a good idea. BlueZ daemon works kind similar to the >> kernel, the internal API may change so building out of the tree will >> never be very stable, and you still have to comply to GPL. >> >> > Solution B) Moving to the latest Bluez version and use the GATT server >> > D-BUS API. But it means I need to remove and replace Bluez on my >> > stable Debian. I understand this solution is the long term solution >> > but it might take a while before the Linux distributions used this >> > version of Bluez. >> >> If more people like you starting using this features it might become >> stable faster, thus we encourage people to go with this solution. Btw, >> you can disable the BlueZ from your distro and just run BlueZ from >> source without overwriting anything from your distro. >> >> > So, is it possible to have an out of the tree plugin with v5.23? I saw >> > `sixaxis` plugin. But this plugin does not manipulate GATT services >> > and characteristics. >> >> Possible, yes, but it is not recommended, but you can try to create a >> external plugin that is build within the source tree so that we keep >> it working as we change the internal APIs. > > External plugins (like sixaxis) are able to use only btd_* (plus few > exceptions) functions. If you want to use other symbols you would have > to go with builtin plugin. > > -- > BR > Szymon Janc -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
