Received-SPF: pass (google.com: domain of linux-bluetooth+bounces-2867-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
From: Chris Laplante <Chris.Laplante@ezurio.com>
To: "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>
CC: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Subject: Maximum Bonded Devices
Thread-Topic: Maximum Bonded Devices
Thread-Index: AdqAcgMJHCNRz56XQrWX+InNCWrc+A==
Date: Wed, 27 Mar 2024 18:15:48 +0000
Message-ID:
 <PH7PR14MB53009C64A876F92F7F472CB5E9342@PH7PR14MB5300.namprd14.prod.outlook.com>
Accept-Language: en-US
Content-Language: en-US
x-ms-exchange-antispam-messagedata-chunkcount: 1
x-ms-exchange-antispam-messagedata-0:
 =?us-ascii?Q?4qf682oIhmUEEL1ReZJ9bO1FSdQxrK3sy2BDUl4RbZLEJ/MQ6AxSPZ2TvmbS?=
 =?us-ascii?Q?lK+GBaAayKYGMKKK84Vl+oPvmLz6NjP4l03FXs4x0Z7YdNf5tLFyC+45YRX1?=
 =?us-ascii?Q?SyvecfLfNG4J2pfg7cR8TBWqxgSxF4T0ysVVmO8ktab8WK0OJf6jUlY+2JFA?=
 =?us-ascii?Q?pXy7dIZPPpH7Zg1iZh0NkMd47VceD65ivD04T687+SCAU/YCc14K2K+I9+Q6?=
 =?us-ascii?Q?PaAFcqSFVE+udxAJTsIthQ7U70ZmpUd8omniJ84IorLHTMRLBtej7Q5RVHbt?=
 =?us-ascii?Q?Fi5LotD04dmTrLuV1m5UJWNc9KKG/YwM2jzPtzhrB1dQGgYsHSnHHNHrW+1+?=
 =?us-ascii?Q?KrGoAREnZ2HFD8GiP5KYQH/XaMtUalfxIui87hhuyfXuMdEGT+TdzPRLfLmK?=
 =?us-ascii?Q?H0gg5/FtV6WlPkz/cUe5ZY19xnoFT0h7yz6zQKq2wjoYfHMb3Kq7EqkWiTcK?=
 =?us-ascii?Q?5m6NsbdnVYHMh3o9TIGlCKteHj/VBhZpiGqbp4Sm1C/wP2EN9hpoxVPdOa6h?=
 =?us-ascii?Q?GIHbLt+XppivOY6Ez9YfBsxPnKfQ4jI0BWO1ro7OYGz3tuyCmicWMK1szyNf?=
 =?us-ascii?Q?HP3Ehg84/2Zlih0CWsKtOmBu29Z4dHVS2O8Mv3Jt7GbXpSQc45bjWsoFZkQT?=
 =?us-ascii?Q?rNYj1Zj4XlUxMnQFYdmMANEaFcG1eQdD3JP/PdPVRpbnhUhix1L96snzfreP?=
 =?us-ascii?Q?GejcbKv1173z1f62TrnfxkS2xa+JBJIei7OVDoDe4S7MRsasUGk5TKWnyjT0?=
 =?us-ascii?Q?FLc5SZgUw6UXmfBJdkSKVhpIqhDU8yjTEh+mT65T+ifV5f1TE3yr20/zHglw?=
 =?us-ascii?Q?jGkJ5p8EVHMEa4exzBt+TnYBrA0Y/WP1EUDdAJc4UiaKvA+gqq8/3dNV28RI?=
 =?us-ascii?Q?Q1xNAjw572hYtDXVXxt8j1ZwD65TgkUG4jMqUYTOObbhxfWIsQaRvlgG03Qo?=
 =?us-ascii?Q?gUz8MC4SqZes9DwW74+oOHLY9Wnhj8sFMpuDkt0XAXynmkyDhl3Kbfloym/B?=
 =?us-ascii?Q?kAGv7GSD2fS+ydm9rFs2v3DBBxu2BhYxNfmgP98TyioD+d+lsmU+JxYbRI+x?=
 =?us-ascii?Q?ogqkAlCapdOSsWnJxgTjpqtNjyGYEO4A3G8zrnoJpaIzJCOgU5mvqfyED5Me?=
 =?us-ascii?Q?xf0m8TJDuziMnfHZXPPIs4TG/yLr/Atu6CEpK/H4QsW6Ixgei9H6U3+mLavg?=
 =?us-ascii?Q?P8SFmZ1G7h96lwfQdZYTYiiLr7i+JFUVmr20YOYKa0KrgrDQmpGkFl7/8yRp?=
 =?us-ascii?Q?NsXE5Njlud0KfBYC//xUHWcoxRnJSr178jGE2ExjqzHpB4jfZNwCOSRuUrAh?=
 =?us-ascii?Q?NJKkBpmy54BzttQBl57mpKL5LusbMfzdDIvMx/5GlqwVi343i0IJiqOUt7gr?=
 =?us-ascii?Q?2GntIYG83dtUuv0LItiJ7CP93L7KWfu0QPbYEy6M+GkIjyqWWBSdHKbvF7hO?=
 =?us-ascii?Q?U1Uqstmxu/0YGx+6quTFEpbLmHDEeh/GTomWbqxFkaRGNCCb5FOs/9oSTZ5I?=
 =?us-ascii?Q?4j4x+GrsjjyqLQLmfSWsuYGSAEN67spj7LLrlcBYqNfBKbyIjs9lKIbbw6ev?=
 =?us-ascii?Q?mfRyhj51vkGJzH+F1IWFANq43QghmVZ4Xq2IQ50WtKfivEJuNquWv0uLBzjo?=
 =?us-ascii?Q?nb7R62Xacjmw38ZSu0OOkYS5meU9hHpiOLeF0rBguS5y?=
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
Precedence: bulk
X-Mailing-List: linux-bluetooth@vger.kernel.org
List-Id: <linux-bluetooth.vger.kernel.org>
List-Subscribe: <mailto:linux-bluetooth+subscribe@vger.kernel.org>
List-Unsubscribe: <mailto:linux-bluetooth+unsubscribe@vger.kernel.org>
MIME-Version: 1.0
X-OriginatorOrg: ezurio.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-AuthSource: PH7PR14MB5300.namprd14.prod.outlook.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 9854d6b4-5526-47a8-8b47-08dc4e89ed8d
X-MS-Exchange-CrossTenant-originalarrivaltime: 27 Mar 2024 18:15:48.2202
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: a67ad7fe-2b14-4d12-b58f-bb509b58f338
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: uH5eXfkn1HClqLC/PeT7NgqjZmfI1m719HAbiMcJV9rtwhOfVWDVBLLuh9j7MJOU5hHJXzLFMJEd67ctWVWS/MHK9Ie4sRFdlfhkJLBaeWU=
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO6PR14MB4273

Hi,

I have a customer with an issue where they are unable to get 30 devices pai=
red and bonded when the BL5340PA (nRF5340) SoC as their central device.

Following details might help you out-
1.      They are using the hci_usb sample code as the firmware on the SoC.
2.      The stack on the host Linux system being used is BlueZ (version 5.6=
6)

They are able to pair and bond with upto 8 devices pretty quickly and then =
this process slows down and they aren't able to pair with more than 12-15 s=
ensors in a single go.
After the pairing and bonding process stagnates at around 12-15 sensors if =
they restart the host system (and in turn the SoC as well) they are able to=
 pair with a few more sensors but not 30 sensors.
So far out of the things that they have tried out to identify the source of=
 the problem it has something to do with the BlueZ stack configuration ( th=
ey are currently using the default stack configuration) and/ or the firmwar=
e configuration parameters.

Do you have any idea on what configuration parameters could be causing this=
 behaviour and/ or what configuration changes need to be made so that they =
can achieve the target of pairing and bonding with 30 sensors. If you have =
any more questions please let me know.

I believe the default is set to something like 65K devices per MaxControlle=
rs in main.c as well as main.conf

parse_config_u16(config, "General", "MaxControllers",
                                                &btd_opts.max_adapters,
                                                0, UINT16_MAX);

# Maximum number of controllers allowed to be exposed to the system.
# Default=3D0 (unlimited)
#MaxControllers=3D0

I am assuming the issue isn't BlueZ specific but if there is any thoughts o=
r guidance you may have it would be appreciated.

Thanks
Chris

THE INFORMATION CONTAINED IN THIS DOCUMENT IS OF A PROPRIETARY NATURE AND I=
S INTENDED TO BE KEPT CONFIDENTIAL BETWEEN THE SENDER AND THE INTENDED RECI=
PIENT. IT MAY NOT BE REPRODUCED OR USED WITHOUT EXPRESS WRITTEN PERMISSION =
OF EZURIO