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From: David Frey <dpfrey@gmail.com>
To: linux-bluetooth@vger.kernel.org
Subject: bluetoothctl "advertise on" fails
Date: Tue, 28 May 2019 13:54:55 -0700	[thread overview]
Message-ID: <ae0ac0fb-faae-edaa-7205-9ef9d6b03edd@gmail.com> (raw)

Hi,

I have an embedded system running Yocto Linux and a desktop using Arch
Linux.  Bluez is 5.50 in both cases. I'm using the same Cypress CYW20719
Bluetooth chipset connected via a UART.  On the embedded system, running
"advertise on" in bluetoothctl fails with the error message:

"Failed to register advertisement: org.bluez.Error.NotPermitted"

I dug into the source code a bit and I suspect that the error is being
produced in register_advertisement() from advertising.c:
https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/src/advertising.c?h=5.50#n1135

On my Linux PC, running "advertise on" is successful.

The error message in the code is "Maximum advertisements reached", so I
decided to pursue that.  I ran the command "dbus-send --system
--print-reply --type=method_call --dest=org.bluez /
org.freedesktop.DBus.ObjectManager.GetManagedObjects" on both the
embedded system and the PC.

This is the snippet from the embedded system that I think is pertinent:
dict entry(
   string "org.bluez.LEAdvertisingManager1"
   array [
      dict entry(
         string "ActiveInstances"
         variant                         byte 0
      )
      dict entry(
         string "SupportedInstances"
         variant                         byte 0
      )
      dict entry(
         string "SupportedIncludes"
         variant                         array [
               string "local-name"
            ]
      )
   ]
)

And the corresponding snippet from the PC:
dict entry(
   string "org.bluez.LEAdvertisingManager1"
   array [
      dict entry(
         string "ActiveInstances"
         variant                         byte 0
      )
      dict entry(
         string "SupportedInstances"
         variant                         byte 5
      )
      dict entry(
         string "SupportedIncludes"
         variant                         array [
               string "tx-power"
               string "appearance"
               string "local-name"
            ]
      )
   ]
)

I'm not sure what "SupportedIncludes" really means, but I immediately
noticed that the value for "SupportedInstances" on the embedded system
is 0 while the on the PC it's 5.

Why are these values different?  Please let me know if there is any
other information that would be useful.

Thanks,
David

                 reply	other threads:[~2019-05-28 20:54 UTC|newest]

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