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From:   Chris Laplante <Chris.Laplante@lairdconnect.com>
To:     "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>
CC:     Chris Laplante <Chris.Laplante@lairdconnect.com>
Subject: Connection Event Length
Thread-Topic: Connection Event Length
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Date:   Wed, 3 Aug 2022 16:01:52 +0000
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Hi,

Can someone tell me if the Connection Event Min and Max lengths can be set =
in BlueZ? I have a customer using BlueZ and their throughput is less than o=
ptimal. It looks like from their sniffer logs that there is a single PDU se=
nt every 18.75mS connection interval. Looking at the mgmt-api.txt doc in th=
e BlueZ-5.64 release it doesn't seem the conn event length parameters can b=
e changed.

New Connection Parameter Event
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D

        Event Code:             0x001c
        Controller Index:       <controller id>
        Event Parameters:       Store_Hint (1 Octet)
                                Param {
                                        Address (6 Octets)
                                        Address_Type (1 Octet)
                                        Min_Connection_Interval (2 Octets)
                                        Max_Connection_Interval (2 Octets)
                                        Connection_Latency (2 Octets)
                                        Supervision_Timeout (2 Octets)
                                }

        This event indicates a new set of connection parameters from
        a peripheral device.

        The Store_Hint parameter indicates whether the host is expected
        to store this information persistently or not.

        Possible values for the Address_Type parameter:
                0       Reserved (not in use)
                1       LE Public
                2       LE Random

        The Min_Connection_Interval, Max_Connection_Interval,
        Connection_Latency and Supervision_Timeout parameters are
        encoded as described in Core 4.1 spec, Vol 2, 7.7.65.3.

I am a novice BlueZ user so if for one I am not looking in the right place =
please point me to where I should be looking for this info. And also if it =
is supported please could you provide details on how it can be supported.

Thank you in advance!

Chris
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