On 11/04/2014 08:11 PM, Arman Uguray wrote:
Hi Edmund,
On Tue, Nov 4, 2014 at 4:04 AM, Urbani, Edmund
<edmund.urbani@xxxxxxxxxxxx> wrote:
On 11/03/2014 08:32 PM, Arman Uguray wrote:
Hi Edmund,
On Mon, Nov 3, 2014 at 7:38 AM, Urbani, Edmund
<edmund.urbani@xxxxxxxxxxxx> wrote:
Hello all,
I am trying to write a simple GATT-based service of my own. Right now I
don't really know which docs I should be looking at. I have skimmed
through
bluez sources (5.23) and found gatt-service.h and gatt.h, as well as the
gatt-example plugin.
So far I am still trying to figure out whether I should be going the C
API
route or maybe use the D-Bus interface. Also gatt-service.c seems to
suggest
that there is a way to register a GATT service over D-Bus but running it
gives me this:
RegisterService: Method "RegisterService" with signature "oa{sv}" on
interface "org.bluez.GattManager1" doesn't exist"
The reason you're not seeing GattManager1 is because it's hidden
behind the "experimental" flag. So you need to configure and run bluez
with the --enable-experimental and the --experimental flags
respectively.
That said, that API implementation isn't complete and isn't in fact
even wired up with the internal attrib-server. We're working towards
rewriting all of the C API and finally implementing the proposed D-Bus
API but until then, I would ignore doc/gatt-api.txt (it's only a
proposal at the moment and isn't even included in release tarballs).
So for now you have to use the C API route. There will probably be an
announcement once that D-Bus API is finally supported.
Any pointers to help me get started would be appreciated. Thanks!
Kind regards,
Edmund
Cheers,
Arman
Thanks, I won't bother with the D-Bus interface then. But if the C API is
being rewritten now, that sounds like there is currently no stable API
available at all. :/ Or is it just the internals being rewritten?
The C API for GATT interactions is being rewritten, i.e. the code in
attrib/* is being deprecated in favor of code in src/shared/gatt*. You
can still keep using the existing APIs though at some point we will
rip out the existing attrib-server to be a combination of
shared/gatt-db and shared/gatt-server. So, make sure you keep track of
the patches going in.
Keep in mind that if you're developing your code on top of the master
branch then things are meant to be in flight and unstable there, so
you should follow releases anyway. I think we'll figure out a way so
that the C based GATT server/client won't be entirely broken for
people in between official BlueZ releases.
So I assume, the fastest route the get a prototype that does something,
would be to get gatt-example.c to run and then modify that, right?
Yes, that is the easiest way right now. When the new C APIs are mature
enough we will convert gatt-example to use the new code but that's
still a few months down the line.
Kind regards,
Edmund
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Cheers,
Arman
Thanks, Arman. I now have a basic service with one characteristic and a
read-only value up and running (I can see and read its value from another system
using gatttool... though my iOS app still fails to discover the service :/ ).
What I actually need however is a read/write attribute and a way to react to
write requests. The examples in gatt-service.c all seem to be read-only. How
would I get a call-back for an incoming write request?
Kind regards,
Edmund
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