Re: OT: Bluetooth receiver/transmitter

[Fred Smith]

On Sat, Jul 18, 2020 at 03:21:57PM -0300, Fernando Cassia wrote:
>On Fri, Jul 17, 2020, 21:52 George N. White III <[1]gnw...@gmail.com>
>wrote:
> 
>[2]CSR was formerly Cambridge Silicon Radio, now owned by Qualcomm and
>qualified
>under the name "Qualcomm Technologies International, Ltd. (QTIL)".   It
>may not be easy
>to see technical documentation:
>Qualcomm Technologies International, Ltd. Confidential and Proprietary
>- Qualcomm Technologies International, Ltd. (formerly known as
>Cambridge Silicon Radio Ltd.) NO PUBLIC DISCLOSURE PERMITTED: Please
>report postings of this document on public servers or websites to:
>[3]docctrlag...@qualcomm.com.
> 
>I'm bemused to learn that someone with a law degree is sitting
>comfortably in a corporate HQ thinking that forcing employees to paste
>that legal scare blob on every pdf automagically puts the world+dog
>into compliance of their imaginary restrictions.

At the place I worked (til retirement a year and a half ago) it was inserted
automagically by the mail system (Exchange) and us individual mail users had
no say in the matter.

-- 
 Fred Smith -- fre...@fcshome.stoneham.ma.us -
The Lord detests the way of the wicked 
  but he loves those who pursue righteousness.
- Proverbs 15:9 (niv) -
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Re: OT: Bluetooth receiver/transmitter

[Fernando Cassia]

On Sat, Jul 18, 2020, 16:07 George N. White III  wrote:

>
> In my experience, the docs that might actually be useful often require a
> non-disclosure agreement (NDA).
>

... And can be found with a simple Google search with "site:.ru" as
parameter.
;)

Case in point:
https://www.google.com/search?newwindow=1&client=ms-android&q=Errata+confidential+site%3A.ru&sclient=mobile-gws-wiz-serp

FC
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Re: OT: Bluetooth receiver/transmitter

[George N. White III]

On Sat, 18 Jul 2020 at 15:40, Joe Zeff  wrote:

> On 07/18/2020 12:21 PM, Fernando Cassia wrote:
> > I'm bemused to learn that someone with a law degree is sitting
> > comfortably in a corporate HQ thinking that forcing employees to paste
> > that legal scare blob on every pdf automagically puts the world+dog into
> > compliance of their imaginary restrictions.
>
> That's not why they do it.  It's so that when (not if) somebody uses the
> document improperly (or whatever) they can show that they've made a good
> faith effort to prevent it and aren't responsible.
>

In my experience, the docs that might actually be useful often require a
non-disclosure agreement (NDA).

-- 
George N. White III
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Re: OT: Bluetooth receiver/transmitter

[Fernando Cassia]

On Sat, Jul 18, 2020, 15:40 Joe Zeff  wrote:

>
> That's not why they do it.  It's so that when (not if) somebody uses the
> document improperly (or whatever) they can show that they've made a good
> faith effort to prevent it and aren't responsible.


Hmmm... Yep, that could be one of its uses.

What about the paragraph about "reporting sightings of the document on
public servers"...

It's quite obvious that ain't working, and that nobody is "policing"

LOL

FC
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Re: OT: Bluetooth receiver/transmitter

[Joe Zeff]

On 07/18/2020 12:21 PM, Fernando Cassia wrote:
I'm bemused to learn that someone with a law degree is sitting 
comfortably in a corporate HQ thinking that forcing employees to paste 
that legal scare blob on every pdf automagically puts the world+dog into 
compliance of their imaginary restrictions.


That's not why they do it.  It's so that when (not if) somebody uses the 
document improperly (or whatever) they can show that they've made a good 
faith effort to prevent it and aren't responsible.

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Re: OT: Bluetooth receiver/transmitter

[Fernando Cassia]

On Fri, Jul 17, 2020, 21:52 George N. White III  wrote:

>
> CSR  was formerly Cambridge
> Silicon Radio, now owned by Qualcomm and qualified
> under the name "Qualcomm Technologies International, Ltd. (QTIL)".   It
> may not be easy
> to see technical documentation:
>
> Qualcomm Technologies International, Ltd. Confidential and Proprietary -
> Qualcomm Technologies International, Ltd. (formerly known as Cambridge
> Silicon Radio Ltd.) NO PUBLIC DISCLOSURE PERMITTED: Please report
> postings of this document on public servers or websites to:
> docctrlag...@qualcomm.com.
>


I'm bemused to learn that someone with a law degree is sitting comfortably
in a corporate HQ thinking that forcing employees to paste that legal scare
blob on every pdf automagically puts the world+dog into compliance of their
imaginary restrictions.

FFS they paste the same legal scare paragraph even into datasheets that are
all over the web including distributors like digikey.

Case in point:
https://usermanual.wiki/Document/kba1807200050301qualcommandroidgoperformancetuningguide.1956213859/view

Insert Simpsons meme/gif
"Can you imagine a world without lawyers?"
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Re: OT: Bluetooth receiver/transmitter

[Ed Greshko]

On 2020-07-19 00:17, George N. White III wrote:
> Glad you found something that works.
>

Well, it really wasn't a matter of "finding".  More a matter of reverting to 
something I knew would work.

-- 
The key to getting good answers is to ask good questions.
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Re: OT: Bluetooth receiver/transmitter

[George N. White III]

On Sat, 18 Jul 2020 at 08:14, Ed Greshko  wrote:

> On 2020-07-18 19:03, George N. White III wrote:
> >
> > > BT has lots of features, you may be able to configure around this
> or
> > > your device may need "quirks" support in a driver.
> >
> > And, the instructions for this can be found?
> >
> >
> > You can hope for a recipe in some blog, otherwise you work down
> the chain
> > from the usb driver, reading kernel docs and man pages.
> >
> >
>
> Oh, it sounded as if you'd done this before and knew where to find more
> details.
>

All my experience has been with wifi dongles.   My last rodeo was a few
years ago
when I needed to add AP support to a wifi module.   Other people were
working on
the basic AP support, so once found their git repos it only needed a simple
tweak.
By the time I was satisfied that it was working reliably the support had
been added
upstream in the kernel, so I only gained a few months. I did notice
recently that the
old module has been removed from the kernel and the chip is now supported
by a different module with no AP support.

>
> I wasn't going to spend any energy on it anyway.
>

My experience proved useful as a learning exercise, and I did need the AP.
 It only took a
few evenings, so faster than waiting for some other dongle that also might
have problems.

>
> It was easier to slap a return address on the box from momoshop, get a
> refund, and
> get a working 4.0 adapter.  That took less than 24hrs and shipping was
> free.
>

Glad you found something that works.

-- 
George N. White III
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Re: OT: Bluetooth receiver/transmitter

[Ed Greshko]

On 2020-07-18 19:03, George N. White III wrote:
>
> > BT has lots of features, you may be able to configure around this or
> > your device may need "quirks" support in a driver.
>
> And, the instructions for this can be found?   
>
>
> You can hope for a recipe in some blog, otherwise you work down the chain 
> from the usb driver, reading kernel docs and man pages.
>
>

Oh, it sounded as if you'd done this before and knew where to find more details.

I wasn't going to spend any energy on it anyway.

It was easier to slap a return address on the box from momoshop, get a refund, 
and
get a working 4.0 adapter.  That took less than 24hrs and shipping was free.

-- 
The key to getting good answers is to ask good questions.
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Re: OT: Bluetooth receiver/transmitter

[George N. White III]

On Fri, 17 Jul 2020 at 22:06, Ed Greshko  wrote:

> On 2020-07-18 08:51, George N. White III wrote:
> >
> >
> > Did the packaging have the bluetooth logo <
> https://www.bluetooth.com/develop-with-bluetooth/marketing-branding/>?
>  To get the logo your device has to pass
> > the Bluetooth Qualification Process.Can you find your device <
> https://launchstudio.bluetooth.com/Listings/Search>?   I did find
> > https://launchstudio.bluetooth.com/ListingDetails/48853.
>
> The packaging actually lists
>
> https://launchstudio.bluetooth.com/ListingDetails/75270


This says:

Universal field Bluetooth chip. Bluetooth BR/EDR BLE Dual Mode Chip. *A
highly integrated Chip for Bluetooth data stream process and audio player*,
BR80xx integrates a low power MCU, RF transceiver, Baseband, Modem, USB OTG
in a single chip. BR80xx offers low cost, low power consumption, flexible
and more powerful Bluetooth application.

I was just looking at another dongle chipset

which
says:

Applications


   - Mono headset
  - Stereo headset
  - Real Wireless Stereo (RWS) headset
  - Mono speaker
  - Stereo speaker

So cheap dongles are being made using chips intended for use in BT audio
devices.
I doubt these have all the capabilities expected by the kernel modules.


>
> > btmon shows...
> >
> > > HCI Event: Command Complete (0x0e) plen 6#62
> [hci0] 12.841706
> >   Delete Stored Link Key (0x03|0x0012) ncmd 1
> > Status: Unsupported Feature or Parameter Value (0x11)
> > Num keys: 0
> >
> >
> > BT has lots of features, you may be able to configure around this or
> > your device may need "quirks" support in a driver.
>
> And, the instructions for this can be found?
>

You can hope for a recipe in some blog, otherwise you work down the chain
from the usb driver, reading kernel docs and man pages.

The source for the kernel module may have some examples.   It would help to
have the (secret?) details for your chipset, but you could get lucky and
find that
someone has done most of the work for a similar USB dongle.


> >
> > So, I would stay away from Version 5 products for the time being.
>

Or spend time doing the research to find the qualification test page.
 Amazon should require vendors
to provide a link.


> >
> > Side note:  The bluez maintainers didn't respond to my query about
> support for this adapter.  :-(
> >
> >
> > From a youtube comment: "I bought some generic CSR V5, and my PC
> detected them,
> > but they would not connect to any devices. All 5 of them don't work."
> >
> > Some cheap USB rf devices were designed to be bundled with a particular
> external
> > device (keyboard, mouse, headphone, etc) and lack capabilities expected
> from a general
> > purpose device.
> >
> > I expect the maintainers have enough work just keeping up with requests
> from manufacturers.
> > One way to get their attention is to send them a couple devices, but I
> doubt they are interested
> > in devices that weren't qualified.
>
> It would appear that this one is qualified.
>

Yes, but for use battery powered headphones or speakers -- it even has
charging circuitry.


>
> And, at the very least, they could respond with a request for more
> information or a "gift".
>
> >
> > Try a USB 2 port -- some bt5 dongles don't work with USB 3 ports (not
> > surprising, due to the RF interference problems of USB 3).
>
> I am using a USB 2 port.
>

-- 
George N. White III
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Re: OT: Bluetooth receiver/transmitter

[George N. White III]

On Sat, 18 Jul 2020 at 06:00, Bob Marcan  wrote:

> On Fri, 17 Jul 2020 20:59:06 +0100
> Paul Smith  wrote:
>
> > On Fri, Jul 17, 2020 at 7:14 PM Samuel Sieb  wrote:
> > >
> > > > I would like to buy a cheap Bluetooth receiver/transmitter for my
> > > > desktop computer running Fedora 32. I have searched eBay for that,
> but
> > > > meanwhile learned that most of them do not work on Linux. So, could
> > > > you  please advise me on that?
> > >
> > > Where did you see that most don't work?  I think it's the opposite.  As
> > > far as I know, they all work.  It's USB wifi devices that you're more
> > > likely to have trouble with (at least 5GHz ones).  I recently needed a
> > > bluetooth dongle for BLE and picked one of the cheaper ones I could
> find
> > > and it just worked.
> >
> > Thanks, Samuel and George. I found issues of compatibility with Linux at:
> >
> > https://www.thetechlounge.com/best-bluetooth-adapter/
> >
> > Meanwhile, I bought the following Bluetooth dongle, which was very
> > cheap and therefore the risk is low:
> >
> > https://www.ebay.com/itm/143581114516
> >
> > Paul
>
>
> Belkin F8T017
>

10 years old, BT 2.1

2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.3: new
> full-speed USB device number 22 using ehci-pci
> 2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.3: New USB
> device found, idVendor=050d, idProduct=0017
> 2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.3: New USB
> device strings: Mfr=1, Product=2, SerialNumber=3
> 2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.3: Product:
> BLUETOOTH USB +EDR ADAPTER Class 1 v2.1 UHE
> 2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.3:
> Manufacturer: Broadcom Corp
> 2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.3:
> SerialNumber: 000A3A88235E
>

-- 
George N. White III
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Re: OT: Bluetooth receiver/transmitter

[Bob Marcan]

On Fri, 17 Jul 2020 20:59:06 +0100
Paul Smith  wrote:

> On Fri, Jul 17, 2020 at 7:14 PM Samuel Sieb  wrote:
> >  
> > > I would like to buy a cheap Bluetooth receiver/transmitter for my
> > > desktop computer running Fedora 32. I have searched eBay for that, but
> > > meanwhile learned that most of them do not work on Linux. So, could
> > > you  please advise me on that?  
> >
> > Where did you see that most don't work?  I think it's the opposite.  As
> > far as I know, they all work.  It's USB wifi devices that you're more
> > likely to have trouble with (at least 5GHz ones).  I recently needed a
> > bluetooth dongle for BLE and picked one of the cheaper ones I could find
> > and it just worked.  
> 
> Thanks, Samuel and George. I found issues of compatibility with Linux at:
> 
> https://www.thetechlounge.com/best-bluetooth-adapter/
> 
> Meanwhile, I bought the following Bluetooth dongle, which was very
> cheap and therefore the risk is low:
> 
> https://www.ebay.com/itm/143581114516
> 
> Paul


Belkin F8T017

2020-07-18T10:57:50+0200 smicro.local.lan kernel: usb 2-5.1.3: new full-speed 
USB device number 19 using ehci-pci
2020-07-18T10:57:50+0200 smicro.local.lan kernel: usb 2-5.1.3: New USB device 
found, idVendor=0a5c, idProduct=4500
2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3: New USB device 
strings: Mfr=1, Product=2, SerialNumber=0
2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3: Product: 
BCM2046B1
2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3: Manufacturer: 
Broadcom
2020-07-18T10:57:51+0200 smicro.local.lan kernel: hub 2-5.1.3:1.0: USB hub found
2020-07-18T10:57:51+0200 smicro.local.lan kernel: hub 2-5.1.3:1.0: 3 ports 
detected
2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.1: new full-speed 
USB device number 20 using ehci-pci
2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.1: New USB device 
found, idVendor=0a5c, idProduct=4502
2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.1: New USB device 
strings: Mfr=0, Product=0, SerialNumber=0
2020-07-18T10:57:51+0200 smicro.local.lan kernel: input: HID 0a5c:4502 as 
/devices/pci:00/:00:1d.7/usb2/2-5/2-5.1/2-5.1.3/2-5.1.3.1/2-5.1.3.1:1.0/0003:0A5C:4502.0005/input/input16
2020-07-18T10:57:51+0200 smicro.local.lan kernel: hid-generic 
0003:0A5C:4502.0005: input,hidraw2: USB HID v1.11 Keyboard [HID 0a5c:4502] on 
usb-:00:1d.7-5.1.3.1/input0
2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.2: new full-speed 
USB device number 21 using ehci-pci
2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.2: New USB device 
found, idVendor=0a5c, idProduct=4503
2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.2: New USB device 
strings: Mfr=0, Product=0, SerialNumber=0
2020-07-18T10:57:51+0200 smicro.local.lan kernel: input: HID 0a5c:4503 as 
/devices/pci:00/:00:1d.7/usb2/2-5/2-5.1/2-5.1.3/2-5.1.3.2/2-5.1.3.2:1.0/0003:0A5C:4503.0006/input/input17
2020-07-18T10:57:51+0200 smicro.local.lan kernel: hid-generic 
0003:0A5C:4503.0006: input,hidraw3: USB HID v1.11 Mouse [HID 0a5c:4503] on 
usb-:00:1d.7-5.1.3.2/input0
2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.3: new full-speed 
USB device number 22 using ehci-pci
2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.3: New USB device 
found, idVendor=050d, idProduct=0017
2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.3: New USB device 
strings: Mfr=1, Product=2, SerialNumber=3
2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.3: Product: 
BLUETOOTH USB +EDR ADAPTER Class 1 v2.1 UHE
2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.3: Manufacturer: 
Broadcom Corp
2020-07-18T10:57:51+0200 smicro.local.lan kernel: usb 2-5.1.3.3: SerialNumber: 
000A3A88235E
2020-07-18T10:57:51+0200 smicro.local.lan mtp-probe[16977]: checking bus 2, 
device 21: 
"/sys/devices/pci:00/:00:1d.7/usb2/2-5/2-5.1/2-5.1.3/2-5.1.3.2"
2020-07-18T10:57:51+0200 smicro.local.lan mtp-probe[16978]: checking bus 2, 
device 20: 
"/sys/devices/pci:00/:00:1d.7/usb2/2-5/2-5.1/2-5.1.3/2-5.1.3.1"
2020-07-18T10:57:51+0200 smicro.local.lan mtp-probe[16977]: bus: 2, device: 21 
was not an MTP device
2020-07-18T10:57:51+0200 smicro.local.lan mtp-probe[16978]: bus: 2, device: 20 
was not an MTP device
2020-07-18T10:57:52+0200 smicro.local.lan kernel: usbcore: registered new 
interface driver btusb
2020-07-18T10:57:52+0200 smicro.local.lan systemd[1]: Starting Load/Save RF 
Kill Switch Status...
2020-07-18T10:57:52+0200 smicro.local.lan kernel: usb 2-5.1.3.1: input irq 
status -75 received
2020-07-18T10:57:52+0200 smicro.local.lan systemd[1]: Started Load/Save RF Kill 
Switch Status.

BR, Bob

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Re: OT: Bluetooth receiver/transmitter

[Patrick O'Callaghan]

On Fri, 2020-07-17 at 18:07 +0100, Paul Smith wrote:
> Dear All,
> 
> I would like to buy a cheap Bluetooth receiver/transmitter for my
> desktop computer running Fedora 32. I have searched eBay for that, but
> meanwhile learned that most of them do not work on Linux. So, could
> you  please advise me on that?

My old dongle didn't support BT 4, so I bought this a month or so ago:

https://www.amazon.co.uk/gp/product/B06XHY5VXF/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I'm sure pretty much anything available now will work out of the box
(no special drivers), but it may depend on what you want to do with it.

poc
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Re: OT: Bluetooth receiver/transmitter

[Ed Greshko]

On 2020-07-18 08:51, George N. White III wrote:
>
>
> Did the packaging have the bluetooth logo 
> ?   To 
> get the logo your device has to pass 
> the Bluetooth Qualification Process.    Can you find your device 
> ?   I did find
> https://launchstudio.bluetooth.com/ListingDetails/48853.

The packaging actually lists

https://launchstudio.bluetooth.com/ListingDetails/75270

>  
>
>
> btmon shows...
>
> > HCI Event: Command Complete (0x0e) plen 6    #62 [hci0] 
> 12.841706
>   Delete Stored Link Key (0x03|0x0012) ncmd 1
>     Status: Unsupported Feature or Parameter Value (0x11)
>     Num keys: 0
>
>  
> BT has lots of features, you may be able to configure around this or
> your device may need "quirks" support in a driver.

And, the instructions for this can be found?

>  
>
>
> So, I would stay away from Version 5 products for the time being.
>
> Side note:  The bluez maintainers didn't respond to my query about 
> support for this adapter.  :-(
>
>
> From a youtube comment: "I bought some generic CSR V5, and my PC detected 
> them,
> but they would not connect to any devices. All 5 of them don't work."
>
> Some cheap USB rf devices were designed to be bundled with a particular 
> external
> device (keyboard, mouse, headphone, etc) and lack capabilities expected from 
> a general 
> purpose device.
>
> I expect the maintainers have enough work just keeping up with requests from 
> manufacturers.
> One way to get their attention is to send them a couple devices, but I doubt 
> they are interested
> in devices that weren't qualified.

It would appear that this one is qualified.

And, at the very least, they could respond with a request for more information 
or a "gift".

>
> Try a USB 2 port -- some bt5 dongles don't work with USB 3 ports (not 
> surprising, due to the RF interference problems of USB 3).

I am using a USB 2 port.


-- 
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Re: OT: Bluetooth receiver/transmitter

[George N. White III]

On Fri, 17 Jul 2020 at 17:15, Ed Greshko  wrote:

> On 2020-07-18 03:59, Paul Smith wrote:
> > On Fri, Jul 17, 2020 at 7:14 PM Samuel Sieb  wrote:
> >>> I would like to buy a cheap Bluetooth receiver/transmitter for my
> >>> desktop computer running Fedora 32. I have searched eBay for that, but
> >>> meanwhile learned that most of them do not work on Linux. So, could
> >>> you  please advise me on that?
> >> Where did you see that most don't work?  I think it's the opposite.  As
> >> far as I know, they all work.  It's USB wifi devices that you're more
> >> likely to have trouble with (at least 5GHz ones).  I recently needed a
> >> bluetooth dongle for BLE and picked one of the cheaper ones I could find
> >> and it just worked.
> > Thanks, Samuel and George. I found issues of compatibility with Linux at:
> >
> > https://www.thetechlounge.com/best-bluetooth-adapter/
> >
> > Meanwhile, I bought the following Bluetooth dongle, which was very
> > cheap and therefore the risk is low:
> >
> > https://www.ebay.com/itm/143581114516
>
> Well, I was like Samuel and thought that all BT dongles work fine under
> Linux.
>
> However, I just bought one to replace a failed device.  It is a newer
> model which is
> marked CSR 5 in support of BT version 5.  It fails to be recognized by
> bluez as adapter.
>

CSR  was formerly Cambridge
Silicon Radio, now owned by Qualcomm and qualified
under the name "Qualcomm Technologies International, Ltd. (QTIL)".   It may
not be easy
to see technical documentation:

Qualcomm Technologies International, Ltd. Confidential and Proprietary -
Qualcomm Technologies International, Ltd. (formerly known as Cambridge
Silicon Radio Ltd.) NO PUBLIC DISCLOSURE PERMITTED: Please report postings
of this document on public servers or websites to: docctrlag...@qualcomm.com.
Restricted Distribution: Not to be distributed to anyone who is not an
employee of either ...

Did the packaging have the bluetooth logo
?
 To get the logo your device has to pass
the Bluetooth Qualification Process.Can you find your device
?   I did find
https://launchstudio.bluetooth.com/ListingDetails/48853.


>
> btmon shows...
>
> > HCI Event: Command Complete (0x0e) plen 6#62 [hci0]
> 12.841706
>   Delete Stored Link Key (0x03|0x0012) ncmd 1
> Status: Unsupported Feature or Parameter Value (0x11)
> Num keys: 0


BT has lots of features, you may be able to configure around this or
your device may need "quirks" support in a driver.


>
> So, I would stay away from Version 5 products for the time being.
>
> Side note:  The bluez maintainers didn't respond to my query about support
> for this adapter.  :-(
>

>From a youtube comment: "I bought some generic CSR V5, and my PC detected
them,
but they would not connect to any devices. All 5 of them don't work."

Some cheap USB rf devices were designed to be bundled with a particular
external
device (keyboard, mouse, headphone, etc) and lack capabilities expected
from a general
purpose device.

I expect the maintainers have enough work just keeping up with requests
from manufacturers.
One way to get their attention is to send them a couple devices, but I
doubt they are interested
in devices that weren't qualified.

Try a USB 2 port -- some bt5 dongles don't work with USB 3 ports (not
surprising, due to the RF interference problems of USB 3).

--
George N. White III
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Re: OT: Bluetooth receiver/transmitter

[Ed Greshko]

On 2020-07-18 03:59, Paul Smith wrote:
> On Fri, Jul 17, 2020 at 7:14 PM Samuel Sieb  wrote:
>>> I would like to buy a cheap Bluetooth receiver/transmitter for my
>>> desktop computer running Fedora 32. I have searched eBay for that, but
>>> meanwhile learned that most of them do not work on Linux. So, could
>>> you  please advise me on that?
>> Where did you see that most don't work?  I think it's the opposite.  As
>> far as I know, they all work.  It's USB wifi devices that you're more
>> likely to have trouble with (at least 5GHz ones).  I recently needed a
>> bluetooth dongle for BLE and picked one of the cheaper ones I could find
>> and it just worked.
> Thanks, Samuel and George. I found issues of compatibility with Linux at:
>
> https://www.thetechlounge.com/best-bluetooth-adapter/
>
> Meanwhile, I bought the following Bluetooth dongle, which was very
> cheap and therefore the risk is low:
>
> https://www.ebay.com/itm/143581114516

Well, I was like Samuel and thought that all BT dongles work fine under Linux.

However, I just bought one to replace a failed device.  It is a newer model 
which is
marked CSR 5 in support of BT version 5.  It fails to be recognized by bluez as 
adapter.

btmon shows...

> HCI Event: Command Complete (0x0e) plen 6    #62 [hci0] 12.841706
  Delete Stored Link Key (0x03|0x0012) ncmd 1
    Status: Unsupported Feature or Parameter Value (0x11)
    Num keys: 0

So, I would stay away from Version 5 products for the time being.

Side note:  The bluez maintainers didn't respond to my query about support for 
this adapter.  :-(

-- 
The key to getting good answers is to ask good questions.
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Re: OT: Bluetooth receiver/transmitter

[Paul Smith]

On Fri, Jul 17, 2020 at 7:14 PM Samuel Sieb  wrote:
>
> > I would like to buy a cheap Bluetooth receiver/transmitter for my
> > desktop computer running Fedora 32. I have searched eBay for that, but
> > meanwhile learned that most of them do not work on Linux. So, could
> > you  please advise me on that?
>
> Where did you see that most don't work?  I think it's the opposite.  As
> far as I know, they all work.  It's USB wifi devices that you're more
> likely to have trouble with (at least 5GHz ones).  I recently needed a
> bluetooth dongle for BLE and picked one of the cheaper ones I could find
> and it just worked.

Thanks, Samuel and George. I found issues of compatibility with Linux at:

https://www.thetechlounge.com/best-bluetooth-adapter/

Meanwhile, I bought the following Bluetooth dongle, which was very
cheap and therefore the risk is low:

https://www.ebay.com/itm/143581114516

Paul
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Re: OT: Bluetooth receiver/transmitter

[Samuel Sieb]

On 7/17/20 10:07 AM, Paul Smith wrote:

I would like to buy a cheap Bluetooth receiver/transmitter for my
desktop computer running Fedora 32. I have searched eBay for that, but
meanwhile learned that most of them do not work on Linux. So, could
you  please advise me on that?


Where did you see that most don't work?  I think it's the opposite.  As 
far as I know, they all work.  It's USB wifi devices that you're more 
likely to have trouble with (at least 5GHz ones).  I recently needed a 
bluetooth dongle for BLE and picked one of the cheaper ones I could find 
and it just worked.

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Re: OT: Bluetooth receiver/transmitter

[George N. White III]

On Fri, 17 Jul 2020 at 14:09, Paul Smith  wrote:

> Dear All,
>
> I would like to buy a cheap Bluetooth receiver/transmitter for my
> desktop computer running Fedora 32. I have searched eBay for that, but
> meanwhile learned that most of them do not work on Linux. So, could
> you  please advise me on that?
>

You need to mention the bluetooth version and the device(s) you want to
use.   In the distant past I used a cheap BT dongle from Pluggable, but
then I got  a BLE device (headphones) that were not supported.

>From Plugable's response to a question on Amazon: "One thing to note
about BLE is that many times its functionality is dependent on appropriate
software being installed for a particular usage."

-- 
George N. White III
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OT: Bluetooth receiver/transmitter

[Paul Smith]

Dear All,

I would like to buy a cheap Bluetooth receiver/transmitter for my
desktop computer running Fedora 32. I have searched eBay for that, but
meanwhile learned that most of them do not work on Linux. So, could
you  please advise me on that?

Thanks in advance,

Paul
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