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Date:   Fri, 25 Feb 2022 15:24:39 -0800
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To:     BlueZ <linux-bluetooth@vger.kernel.org>
Cc:     Jay Foster <jay@systech.com>
From:   Jay Foster <jay.foster@systech.com>
Subject: Missing Network1 Interface
Organization: Systech Corporation
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I have an application that has been in use for many years.  Recently I 
have added support for a different Bluetooth adapter (RTL8821CU using 
the btrtl linux driver).  Mostly, things work as expected.

One application is PAN networking, where the adapter can be in the NAP 
role or PANU role.  When the new adapter is configured in the NAP role, 
the PANU system cannot connect.  Using DBus introspection, I can see 
that the device to which the PANU is trying to connect is missing it's 
org.bluez.Network1 interface.  My application uses the Connect method of 
this interface to connect to the NAP role system.

What would cause a device to lose (not report) it's Network1 interface?
I have tried several different versions of BlueZ (5.19 through 5.63) 
with the same results.

Jay