[Interest] Qt Bluetooth Low Energy set a maximum MTU

[Simon FEUTRIER]

Hi !

Thank you Alex for your time and replies.

Best regards,

Simon


Le ven. 20 nov. 2020 à 08:04, Alex Blasche <alexander.blasche at qt.io> a
écrit :

> Hi Simon
>
> What I meant is that if you *request* a certain max MTU size of 240 bytes,
> the other side might still reject it by responding with an even smaller MTU
> size response. It's the difference between "set" and "request".
>
> Having said all that I can see where the ability of requesting 240 might
> help your particular use case and no there is no public API. You have to
> hack QtBluetooth or write a small Java section setting the value.
>
> --
> Alex
>
> ________________________________________
> From: Simon FEUTRIER <sfeutrier at bluegriot.com>
> Sent: Thursday, 19 November 2020 16:57
> To: Alex Blasche
> Cc: Qt Interest
> Subject: Re: [Interest] Qt Bluetooth Low Energy set a maximum MTU
>
> Hi Alex,
>
> Thank you for your reply.
> I'm a bit lost. It means you can never say : "for this exchange I want
> only packets of size 50 because it is relevant for my use case" ?
>
> Simon
>
>
> Le jeu. 19 nov. 2020 à 16:53, Alex Blasche <alexander.blasche at qt.io
> <mailto:alexander.blasche at qt.io>> a écrit :
> Hi Simon,
>
> there is no way to force a certain MTU size via the QT API. AFAIR you
> cannot force it anyway as both sides can make requests but not demands.
>
> --
> Alex
>
> ________________________________________
> From: Interest <interest-bounces at qt-project.org<mailto:
> interest-bounces at qt-project.org>> on behalf of Simon FEUTRIER <
> sfeutrier at bluegriot.com<mailto:sfeutrier at bluegriot.com>>
> Sent: Thursday, 19 November 2020 09:09
> To: Qt Interest
> Subject: [Interest] Qt Bluetooth Low Energy set a maximum MTU
>
> Hello,
>
> Do you know if it is possible to set the MTU from the Qt side ? I am
> receiving bluetooth messages of size between 240 and 244 (max payload) (by
> notify). I would like to receive only messages of size 240. Is this
> possible ?
>
> Best regards,
>
> Simon
> _______________________________________________
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> Interest at qt-project.org<mailto:Interest at qt-project.org>
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>
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