On Mon, Feb 24, 2020 at 10:57 AM Luiz Augusto von Dentz <luiz.dentz@xxxxxxxxx> wrote: > > Hi Scott, > > On Thu, Feb 20, 2020 at 8:34 PM Scott Shawcroft <scott@xxxxxxxxxxxx> wrote: > > > > Hi! > > > > I'm trying to create a bridge between BLE advertisements and the web > > for sensor data logging. The BLE advertisements use manufacturer data > > to transmit the sensor data. I'm running on a Raspberry Pi 3b. > > > > I've been trying to use the Bluez dbus interface with DuplicateData, > > trying both true and false, and I never seem to get duplicates back. I > > dug into it via hcidump and noticed that the scan enable still has > > filter duplicates set to true regardless. I can only manage to get it > > set to False when using hcitool. > > > > I believe I've tracked the issue down into the kernel here: > > https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git/tree/net/bluetooth/hci_request.c#n858 > > where enabling duplicate filtering is hardcoded. It seems that hcitool > > side steps this by talking directly to the hci device. > > Yep, the kernel code don't actually allow setting the duplicate filter > unfortunately. > > > Could someone confirm I'm on the right track? I'd be willing to plumb > > the DuplicateData value through to the kernel if someone could help me > > find the call path down. > > In the past Marcel was against turning off the duplicate filtering but > since we do have a similar setting over D-Bus, though the later shall > not be confused since tracks duplicates by itself since over D-Bus we > are doing it to prevent duplicate signals, Im with the opinion that > DuplicateData could be used to disable duplicate filtering, default > should be still be enabled though. > > -- > Luiz Augusto von Dentz Thanks for the reply! I agree the default should be to filter duplicates. I'd love to see the Dbus setting actually used in the kernel. Did I find the correct place to change? I'm not sure how it is called from bluez though. (Maybe through the mgmt API?) In the meantime I'm using hcidump + hcitool just fine. Thanks, Scott
