rtl8723au bluetooth device found, lescan finds one result and stops? about rtl8723au_bt

[lwfinger]

I'm not sure either. I do not have an RTL8723AU device, but I have a number of other Realtek devices with associated BT hardware. All of them find all the BT devices that I have here as long as I use "scan" in the hcitool command. When I try the lescan, nothing responds. I'm not sure why, but LE connections appear not to be possible. For what it is worth, the same is true for an Intel BT device as well.

[MattMacGillivray]

hw correction: RTL8723BU device.

Strange that the le scan wouldn't work.
I'm going to try to update bluez.
Might also try poking around in the source (but won't hold out hope).

[lwfinger]

I do have a BU device. Same situation - scan works, but LE scan does not.

[MattMacGillivray]

updated bluez doesn't seem to make a difference in this case.

[MattMacGillivray]

'new' branch on kernel 3.1.8.7+ seems to scan a few more devices.

pi@raspberrypi ~ $ uname -a
Linux raspberrypi 3.18.7+ #755 PREEMPT Thu Feb 12 17:14:31 GMT 2015 armv6l GNU/Linux

scan from rtl8723bu:

pi@raspberrypi ~/rtl8723au_bt $ sudo hcitool -i hci1 lescan
LE Scan ...
7C:D1:C3:3B:6A:17 (unknown)
E2:72:03:D3:3B:B7 (unknown)
E9:14:2B:53:67:5B (unknown)
^Cpi@raspberrypi ~/rtl8723au_bt $

Interestingly, if i leave it scanning for a while, it only ever returns unique bluetooth device IDs. Never a duplicate. Sounds like a bug somewhere in there.

[MattMacGillivray]

'new' branch works for LE advertising on kernel 3.18.7+

[MattMacGillivray]

'test' branch works for LE advertising on kernel 4.1.7+