Hi Konstantin, we have qualified the bluez-5.52 regarding Low Energy using Services and Characteristics with normal read, write and notify but also for long characteristics. Only problem was a bug within bluez where wrong error code was returned in case of read/write at specific offset. The response should be "InvalidOffset" but is "InvalidValueLength". We have fixed this here and submitted the bug. But no answer if patch is applied or not. Best regards Jan -----Original Message----- From: linux-bluetooth-owner@xxxxxxxxxxxxxxx <linux-bluetooth-owner@xxxxxxxxxxxxxxx> On Behalf Of CEE Forostyan, Konstantin Sent: Tuesday, April 21, 2020 12:45 PM To: linux-bluetooth@xxxxxxxxxxxxxxx Subject: How to to get L2CAP Enhanced Credit Based Mode working? 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@xxxxxxxxx> 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@xxxxxxxxx> 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@xxxxxxxxx> 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@xxxxxxxxx> 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
