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Groups > alt.comp.os.windows-11 > #18847

Re: Bluetooth connections

From Paul <nospam@needed.invalid>
Newsgroups alt.comp.os.windows-11
Subject Re: Bluetooth connections
Date 2025-04-30 12:40 -0400
Organization A noiseless patient Spider
Message-ID <vutjpu$m2bm$1@dont-email.me> (permalink)
References <vuqv78$26pqs$1@dont-email.me> <vura4g.t5k.1@ID-201911.user.individual.net> <vurg97$2m684$2@dont-email.me> <vurmb0$2skpm$1@dont-email.me> <vursgq$31ijf$1@dont-email.me>

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On Tue, 4/29/2025 8:56 PM, knuttle wrote:
> On 04/29/2025 7:11 PM, Paul wrote:
>> On Tue, 4/29/2025 5:28 PM, knuttle wrote:
>>
>>>
>>>
>>> Even though I can send files to the computer from the phone, the phone does not appear on the 'Add device' page
>>
>> This is a setting at the phone end.
>>
>> The phone must have the Bluetooth turned on, in
>> the "Discoverable Mode", for a pairing attempt
>> to be made. "Send To" requires successful pairing,
>> with the same six digit code showing on both
>> screens, in order for the pairing to be set up.
>>
>> But no device wants to pair, unless it is put
>> in "Discoverable". It's a kind of permission,
>> assigned to the usage of Bluetooth. My desktop
>> computer is "Discoverable".
>>
>> It is like the usage of an airplane mode - if
>> a device has the Radio portion turned off because
>> the device is on an airplane, that's a permission
>> to use a radio frequency signal. Well, the "discoverable"
>> mode assumes Non-Airplane mode (RF on) plus
>> the Discoverable property means the phone is actively
>> listing to the radio channel for pairing requests.
>> Or scanning for devices to ask, on a broadcast channel.
>>
>>     Paul
> I routinely to the phone, when you try to connect on this Android phone and the Bluetooth is off, the phone ask if you want to turn it on.
> 
> So to answer you question Yes the phone is in the discovery mode

Is the phone within line-of-sight of the other Bluetooth device ?

The Bluetooth devices should work in greenfield mode (legacy bluetooth),
so even if one of the BT is a BT5, it still uses the same kind of
setup as a BT4 device would. The frequencies should be the same.

If a device is Discoverable, I believe it responds to some kind
of "broadcast channel". There is a channel, so the devices can
see a hailing call from other devices.

The nodes which are members of the same piconet, have to
use the same frequency hop pattern, to remain in communications.
That is presumably used during pairing, during profile setup/connected
phases.

Your phone then, is not responding to the broadcast from
the other phone. since both devices are peers, they
can be doing discovery at the same time. Which means
one device will be "eating" the hop pattern of the
other device, once pairing is set up. If the phone is
paired to a hands-free device, at the same time as it
does SendTo with the computer, I don't really know what
happens there. Maybe a peer can participate in two
piconets at a time, but I don't know how that can work
without having two receivers and two hop patterns operating
simultaneously.

I put two pictures in the post to Daniel, of what a
SendTo should look like in W11. There is no pairing sequence
with the six digit numbers in this picture set, as the two
W11 computers were paired previously, and at boot time,
they seem to have a paired status still (no attempt having
been made to disconnect or disrupt the pairing).

   [Picture]

    https://i.postimg.cc/K8C5SmMH/Bluetooth-Pairing-Versus-Connected.gif

    https://i.postimg.cc/yd8xLZN4/Windows-Send-To-Bluetooth-Sequence.gif

  Paul

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Thread

Bluetooth connections knuttle <keith_nuttle@yahoo.com> - 2025-04-29 12:36 -0400
  Re: Bluetooth connections Frank Slootweg <this@ddress.is.invalid> - 2025-04-29 17:43 +0000
    Re: Bluetooth connections knuttle <keith_nuttle@yahoo.com> - 2025-04-29 17:28 -0400
      Re: Bluetooth connections Paul <nospam@needed.invalid> - 2025-04-29 19:11 -0400
        Re: Bluetooth connections knuttle <keith_nuttle@yahoo.com> - 2025-04-29 20:56 -0400
          Re: Bluetooth connections Paul <nospam@needed.invalid> - 2025-04-30 12:40 -0400
    Re: Bluetooth connections Daniel70 <daniel47@eternal-september.org> - 2025-04-30 20:22 +1000
      Re: Bluetooth connections Peter Johnson <peter@parksidewood.nospam> - 2025-04-30 15:33 +0100
        Re: Bluetooth connections Daniel70 <daniel47@eternal-september.org> - 2025-05-01 00:53 +1000
          Re: Bluetooth connections Paul <nospam@needed.invalid> - 2025-04-30 12:53 -0400
            Re: Bluetooth connections Daniel70 <daniel47@eternal-september.org> - 2025-05-02 21:20 +1000
              Re: Bluetooth connections Paul <nospam@needed.invalid> - 2025-05-02 16:41 -0400
                Re: Bluetooth connections Daniel70 <daniel47@eternal-september.org> - 2025-05-03 19:29 +1000
      Re: Bluetooth connections Frank Slootweg <this@ddress.is.invalid> - 2025-04-30 15:46 +0000
        Re: Bluetooth connections Daniel70 <daniel47@eternal-september.org> - 2025-05-01 20:52 +1000
          Re: Bluetooth connections Frank Slootweg <this@ddress.is.invalid> - 2025-05-01 12:40 +0000
            Re: Bluetooth connections Daniel70 <daniel47@eternal-september.org> - 2025-05-02 19:21 +1000
              Re: Bluetooth connections Frank Slootweg <this@ddress.is.invalid> - 2025-05-02 10:37 +0000
            Re: Bluetooth connections Daniel70 <daniel47@eternal-september.org> - 2025-05-02 19:26 +1000
              Re: Bluetooth connections Frank Slootweg <this@ddress.is.invalid> - 2025-05-02 10:37 +0000
                Re: Bluetooth connections Daniel70 <daniel47@eternal-september.org> - 2025-05-03 19:54 +1000
        Re: Bluetooth connections Daniel70 <daniel47@eternal-september.org> - 2025-05-03 19:48 +1000
          Re: Bluetooth connections Paul <nospam@needed.invalid> - 2025-05-03 15:40 -0400
      Re: Bluetooth connections Paul <nospam@needed.invalid> - 2025-04-30 12:15 -0400

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