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Re: Ubuntu 14.04 + bluetooth

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Keith wrote:
> On 30/10/16 17:03, Paul wrote:
>> Keith wrote:
>>>
>>> My remaining challenge is to get Bluetooth working correctly.  It all
>>> _seems_ to work; I can turn Bluetooth on and off, I can make it
>>> visible and not.  But my phone cannot 'see' the laptop, and the laptop
>>> can't 'see' the phone, even when both are flagged visible.  I know the
>>
>> https://github.com/khvzak/bluez-tools
>>
>> bt-adapter
>> ==========
>>
>> - List available adapters
>> - Show information about adapter (incl properties)
>> - Discover remote devices (with remote device name resolving)
>> - Change adapter properties (eg. Name, Discoverable, Pairable, etc)
> 
> Nice toolset, but sadly the problem persists - can't see the phone, and 
> the phone can't see the laptop.

Another possibility, is it's set up a Personal Area Network,
but this article makes it look like some proactive
steps must be taken. This is unlikely to happen by accident.

http://bluez.sourceforge.net/contrib/HOWTO-PAN

You could try ifconfig and see if
there is anything suspicious in there.

This would be on an "ordinary" networking
case, with only an Ethernet.

    ifconfig

    eth0
    lo

Whereas the PAN might add a bnep0 to it.

*******

Another possibility, is you have USB3 on the
computer, and the USB3 peripheral is "radiating"
a 2.4GHz signal. Intel wrote a paper on this,
complete with a spectrum analyzer scan, and
USB3 emits a broad signal with a peak at
maybe 2.5GHz or so. This could smother the
Bluetooth band and cover all the frequency
hopping bins, such that nothing gets through.

The USB2 on the other hand, "emits nothing".
At least, the spectral content would take
a high harmonic to hit any Wifi-like services.

USB3 has been known to interfere with
wireless keyboards too - you move the USB3
cable behind the computer so it's further
away from the keyboard area.

For a test, you could disconnect the USB3
peripheral, so nothing uses a blue USB3 port,
and retest for signal.

Since I have no Bluetooth here at all,
I can't simulate anything. I don't even
have a cellphone :-) Just VOIP.

    Paul

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Ubuntu 14.04 + bluetooth Keith <me@privacy.net> - 2016-10-30 10:55 +0000
  Re: Ubuntu 16.04 + bluetooth (Was: Ubuntu 14.04 + bluetooth) Keith <me@privacy.net> - 2016-10-30 11:08 +0000
    Re: Ubuntu 16.04 + bluetooth (Was: Ubuntu 14.04 + bluetooth) Skippy Fandango <skippyfandango@ultvok.org> - 2016-10-30 10:07 -0400
  Re: Ubuntu 14.04 + bluetooth Skippy Fandango <skippyfandango@ultvok.org> - 2016-10-30 10:02 -0400
  Re: Ubuntu 14.04 + bluetooth "Jonathan N. Little" <lws4art@gmail.com> - 2016-10-30 10:55 -0400
  Re: Ubuntu 14.04 + bluetooth Paul <nospam@needed.invalid> - 2016-10-30 13:03 -0400
    Re: Ubuntu 14.04 + bluetooth Keith <me@privacy.net> - 2016-10-31 10:24 +0000
      Re: Ubuntu 14.04 + bluetooth Paul <nospam@needed.invalid> - 2016-10-31 08:27 -0400
        Re: Ubuntu 14.04 + bluetooth Keith <me@privacy.net> - 2016-10-31 14:15 +0000
          Re: Ubuntu 14.04 + bluetooth Paul <nospam@needed.invalid> - 2016-10-31 10:29 -0400

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