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
