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From:   John Klug <John.Klug@multitech.com>
To:     Luiz Augusto von Dentz <luiz.dentz@gmail.com>
CC:     Linux-Bluetooth MailingList <linux-bluetooth@vger.kernel.org>
Subject: Re: GattCharacteristic1 WriteValue fails parameter validation in a
 GATT Client
Thread-Topic: GattCharacteristic1 WriteValue fails parameter validation in a
 GATT Client
Thread-Index: AQHYo4jpjMkWkj7OKkekvgeb7zXQNq2V31YAgARbAc4=
Date:   Mon, 1 Aug 2022 16:11:28 +0000
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Luiz Augusto von Dentz writes:=0A=
=0A=
>You can use AcquireWrite and then write directly to the fd received.=0A=
=0A=
I tried AcquireWrite as you suggest.=A0 The result was "NotSupported".  I =
=0A=
should mention that I have tried Nordic's NRF Connect on Android with =0A=
the same GATT Server, and it is able to write to this =0A=
UUID/characteristic just fine.=0A=
=0A=
=0A=
Using "dbus-monitor --system" I see both read and write flags on my charact=
eristic "service0021/char0046" with the correct UUID:=0A=
=0A=
=0A=
signal time=3D1659368288.691466 sender=3D:1.3649 -> destination=3D(null =0A=
destination) serial=3D968 path=3D/; =0A=
interface=3Dorg.freedesktop.DBus.ObjectManager; member=3DInterfacesAdded =
=0A=
=0A=
=A0 =A0object path "/org/bluez/hci0/dev_CC_F9_57_89_8B_D8/service0021/char0=
046"=0A=
=A0 =A0array [=0A=
=A0 =A0 =A0 dict entry(=0A=
=A0 =A0 =A0 =A0 =A0string "org.freedesktop.DBus.Introspectable"=0A=
=A0 =A0 =A0 =A0 =A0array [=0A=
=A0 =A0 =A0 =A0 =A0]=0A=
=A0 =A0 =A0 )=0A=
=A0 =A0 =A0 dict entry(=0A=
=A0 =A0 =A0 =A0 =A0string "org.bluez.GattCharacteristic1"=0A=
=A0 =A0 =A0 =A0 =A0array [=0A=
=A0 =A0 =A0 =A0 =A0 =A0 dict entry(=0A=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0string "UUID"=0A=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0variant =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
string "edf50100-681e-4b92-999c-e16b3a8bc047"=0A=
=A0 =A0 =A0 =A0 =A0 =A0 )=0A=
=A0 =A0 =A0 =A0 =A0 =A0 dict entry(=0A=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0string "Service"=0A=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0variant =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
object path "/org/bluez/hci0/dev_CC_F9_57_89_8B_D8/service0021"=0A=
=A0 =A0 =A0 =A0 =A0 =A0 )=0A=
=A0 =A0 =A0 =A0 =A0 =A0 dict entry(=0A=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0string "Value"=0A=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0variant =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
array [=0A=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 ]=0A=
=A0 =A0 =A0 =A0 =A0 =A0 )=0A=
=A0 =A0 =A0 =A0 =A0 =A0 dict entry(=0A=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0string "Flags"=0A=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0variant =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
array [=0A=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0string "read"=0A=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0string "write"=0A=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 ]=0A=
=A0 =A0 =A0 =A0 =A0 =A0 )=0A=
=A0 =A0 =A0 =A0 =A0]=0A=
=A0 =A0 =A0 )=0A=
=A0 =A0 =A0 dict entry(=0A=
=A0 =A0 =A0 =A0 =A0string "org.freedesktop.DBus.Properties"=0A=
=A0 =A0 =A0 =A0 =A0array [=0A=
=A0 =A0 =A0 =A0 =A0]=0A=
=A0 =A0 =A0 )=0A=
=A0 =A0]=0A=
=0A=
=0A=
=0A=
However, AcquireWrite replies with "Not Supported" which is the text I see =
in the error message in my program:=0A=
=0A=
=0A=
method call time=3D1659368290.693590 sender=3D:1.3987 -> =0A=
destination=3Dorg.bluez serial=3D10 =0A=
path=3D/org/bluez/hci0/dev_CC_F9_57_89_8B_D8/service0021/char0046; =0A=
interface=3Dorg.bluez.GattCharacteristic1; member=3DAcquireWrite =0A=
=0A=
=A0 =A0array [=0A=
=A0 =A0]=0A=
error time=3D1659368290.693700 sender=3D:1.3649 -> destination=3D:1.3987 er=
ror_name=3Dorg.bluez.Error.NotSupported reply_serial=3D10=0A=
=A0 =A0string "Operation is not supported"=0A=
=0A=
Any ideas on where in the BlueZ source I could look for this?  Does anyone =
have an example of doing a GATT Write from a client?=0A=
=0A=
=0A=
=0A=
John Klug=0A=