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From:   John Klug <John.Klug@multitech.com>
To:     Linux-Bluetooth MailingList <linux-bluetooth@vger.kernel.org>
Subject: GattCharacteristic1 WriteValue fails parameter validation in a GATT
 Client
Thread-Topic: GattCharacteristic1 WriteValue fails parameter validation in a
 GATT Client
Thread-Index: AQHYo4jpjMkWkj7OKkekvgeb7zXQNg==
Date:   Fri, 29 Jul 2022 20:41:33 +0000
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I see this is in the example-gatt-server, but not in a client.=A0 Does anyo=
ne have this in an example?  Ideally written in C or C++ with libgio.=0A=
=0A=
My issue is that the parameter list is rejected when I use libgio:=0A=
=0A=
Error=A0message: Method "WriteValue"=A0with=A0signature "aya{sv}"=A0on=A0in=
terface=A0"org.bluez.GattCharacteristic1"=A0doesn't exist=0A=
=0A=
Turning on bluetoothd=A0 -d, I am not seeing this error.=A0 I see my servic=
e appear.=A0 gdbus introspection shows the interface and the WriteValue met=
hod, but the call to WriteValue does not seem to generate any debug output =
in bluetoothd.=0A=
=0A=
I wrote this up in https://discourse.gnome.org/t/how-does-one-find-the-vali=
d-signatures-in-d-bus-for-an-interface-method/10579/6=0A=
=0A=
I have tried both Ubuntu 20.04 on a PC, and on an ARM 32bit processor I hav=
e tried Linux 5.4.199 with BlueZ 5.64.=0A=
=0A=
How does one write to a gatt characteristic in a client if one is not to us=
e WriteValue?=