On Fri, May 31, 2019 at 04:30:38PM +0200, Emil Lenngren wrote: > Hi John, > > Den fre 31 maj 2019 kl 14:27 skrev John Whitmore <arigead@xxxxxxxxx>: > > > > Hello all, > > > > I'm running on two identical embedded Linux Gateway devices, both on > > Ubuntu 16.04 and Bluez 5.37. That's certainly an older version, but > > it's part and parcel of that version of Ubuntu. I'm having an issue > > where the two identical gateway devices are getting different > > responses from a BLE scan, and can't figure out what would be the > > cause. In both cases it's the same peripheral device, a TI CC2650 > > device. On one gateway I get a truncated response with just the MAC > > address and in the other I get the MAC address plus the description > > string "CC2650.." > > > > [bluepy.btle:37] Got: 'rsp=$scan\x1eaddr=b546C0E530068\x1etype=h1\x1erssi=h43\x1eflag=h0\x1ed=b020105030280AA06FF0D0003000011094343323635302053656E736F72546167051208002003020A00\n' > > > > [bluepy.btle:37] Got: 'rsp=$scan\x1eaddr=b546C0E530068\x1etype=h1\x1erssi=h28\x1eflag=h0\x1ed=b020105030280AA06FF0D00030000\n' > > > > I'm probably going to have to get a Bluetooth sniffer device to trace > > this issue, but if anybody had any idea what this would be the case, > > I'd love to hear. > > > > Perhaps even though the Gateways are running the same Hardware and > > Software there might be a Hardware difference in the chipset used or > > something. It's all I can think of. Hopefully get something to help > > diagnose this issue. > > > > In those two messages there is a difference in RSS, is that signal > > strength and could that be the issue? Have to open things up. > > > > Thanks in advance for any help, and apologies I'm at the wrong end of > > a learning curve. > > > > John > > You could try running btmon in a terminal to show the HCI traffic. > There you should see the raw advertising packets in form of LE > Advertising Report packets. You should see both ADV_IND packets as > well as SCAN_RSP packets. Maybe the software doesn't always combine > them and that's why you get different results. And yes RSSI is signal > strength. > > /Emi Thank you for that. I'll have a look into that and see if I can't get to the bottom of this issue.
