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From:   "CEE Forostyan, Konstantin" <Konstantin.Forostyan@peiker-cee.de>
To:     "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>
Subject: How to to get L2CAP Enhanced Credit Based Mode working?
Thread-Topic: How to to get L2CAP Enhanced Credit Based Mode working?
Thread-Index: AQHWF8nrK1u7IRXZhk2vsyaioBaliw==
Date:   Tue, 21 Apr 2020 10:45:06 +0000
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Hi All, 

I'm trying to enable L2CAP Enhanced Credit Based Mode in order to pass BT qualification test GATT/SR/GAC/BI-01-C, but it seems that something is still missing. When my BT stack receives "LE L2CAP: Enhanced Credit Connection Request (0x17)" it answers with "LE L2CAP: Command Reject (0x01) / Reason: Command not understood (0x0000)"

I'm using BlueZ 5.54 and kernel '4.20.0-yocto-standard' with the following patches taken from 'bluetooth-next':

From 145720963b6c68d0c4054112c09050995259b8f8 Mon Sep 17 00:00:00 2001
From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Date: Mon, 2 Mar 2020 16:56:19 -0800
Subject: Bluetooth: L2CAP: Add definitions for Enhanced Credit Based Mode

From 15f02b91056253e8cdc592888f431da0731337b8 Mon Sep 17 00:00:00 2001
From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Date: Mon, 2 Mar 2020 16:56:20 -0800
Subject: Bluetooth: L2CAP: Add initial code for Enhanced Credit Based Mode

From 4be5ca67d59d707a4b1c8608ca230ad65aa4f232 Mon Sep 17 00:00:00 2001
From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Date: Mon, 2 Mar 2020 16:56:21 -0800
Subject: Bluetooth: L2CAP: Add module option to enable ECRED mode

From da49b602f7f75ccc91386e1274b3ef71676cd092 Mon Sep 17 00:00:00 2001
From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Date: Wed, 25 Mar 2020 12:37:53 -0700
Subject: Bluetooth: L2CAP: Use DEFER_SETUP to group ECRED connections

Can anyone help me to enable "Enhanced Credit Based Mode", please?

Thank you and best regards,
Konstantin