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From: Travis Griggs <travisgriggs@gmail.com>
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Subject: 5.43 Experimental Status?
Date: Wed, 11 Jan 2017 14:38:19 -0800
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I=E2=80=99m trying to bring my linux SBC acting as a peripheral up to =
debian stretch. I had been running on jessie, with my own build of bluez =
5.41. I had been modifying the bluetooth.service to execute:

    /usr/lib/bluetooth/bluetoothd -d -E --noplugin=3D*

The latest stretch/testing bluez seems to be 5.43 though:

    dpkg -l | grep bluez
    ii  bluez                         5.43-1                   armhf     =
   Bluetooth tools and daemons

I thought the -E flag was supposed to no longer be necessary after 5.42. =
So I removed it. I updated my own python code to match the small changes =
I found in example-advertisement. But I=E2=80=99m getting the following =
error:

    ERROR:dbus.connection:Unable to set arguments =
(dbus.ObjectPath('/nelson_irrigation/twig_pilot'), {}) according to =
signature None: <class 'ValueError'>: Unable to guess signature from an =
empty dict

Which after googling, was the same error I found a while back when I had =
forgotten to turn -E on with 5.40.=20

So I added the -E back in and it started working as hoped.

Can someone explain why the -E is still needed with 5.43, for dbus code =
like that found in the test/examples? Did it not really get promoted =
after all? Or did I misunderstand the semantics of what was changing?=