Hi Vincent, On Thu, Jan 19, 2017 at 9:52 PM, Vincent Scheib <scheib@xxxxxxxxxx> wrote: > On Mon, Jan 16, 2017 at 5:46 AM, Luiz Augusto von Dentz > <luiz.dentz@xxxxxxxxx> wrote: >> On Sat, Jan 14, 2017 at 6:38 AM, Vincent Scheib <scheib@xxxxxxxxxx> wrote: >>> I just ran into this issue again (being blocked from accessing a standard >>> GATT service) when using bluez. I had an application accessing GATT >>> objects, and also the generic_access service. ... >> >> Well the general idea was to block access if there is a plugin already >> handling a certain service. Now you seem to be claiming this shouldn't >> be the case and any service can be accessed simultaneously by a plugin >> running in daemon process and an application, but I don't think this >> is always true and in some cases they may conflict, or just generate >> duplicated traffic. > > Correct. Bluetooth devices are all required to have a generic_access > service, and I believe applications should be able to use the GATT > protocol to interact with that service. I think that the current > approach bluez has taken of trying to abstract this is a mistake. > There doesn't seem to be value added by doing so, but there is harm in > creating additional ways to interact, harming portability and > requiring more attention and custom code by application developers. Well you seem to forget that there are various ways to get the name, not only GATT. In fact the GAP Service over GATT is just the tip of the iceberg, since GAP define the connection procedures which has very little to do with this service, and when it comes to GAP procedures we do need to know the Name of the devices to display to the user and that may come from advertisements, inquiry results or from Read Name command so we can cache the name so we can display it even when not connected. So if you arguing that the stack should not deal with this service I would have to disagree. >> Perhaps for GAP service itself it is fine to allow applications to >> access it, the problem is if we allow the application to set the name >> like you want does it notifies that do the daemon as well? > > Yes. The same way multiple applications should be able to receive > notifications for one device. Except that org.bluetooth.characteristic.gap.device_name excludes notification support: https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.service.generic_access.xml -- Luiz Augusto von Dentz -- 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
