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From:   "Stotland, Inga" <inga.stotland@intel.com>
To:     "michal.lowas-rzechonek@silvair.com" 
        <michal.lowas-rzechonek@silvair.com>,
        "Gix, Brian" <brian.gix@intel.com>
CC:     "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>
Subject: Re: mesh: org.bluez.mesh.Element.MessageReceived method does not
 provide destination address
Thread-Topic: mesh: org.bluez.mesh.Element.MessageReceived method does not
 provide destination address
Thread-Index: AQHVX2LEtJoH6czNyE6Xu9DaIe4hzqcxs2yAgAuqpwCAAVPggIAAWhSAgADMPACAAHTCAIAAGquA
Date:   Fri, 27 Sep 2019 17:25:30 +0000
Message-ID: <856d4e6bfdbe84b7b7ac3742ebede263c7801346.camel@intel.com>
References: <20190830184301.zd3zaqrw7mv6r252@kynes>
         <20190918085239.xhahxoeqjkcrk3bl@mlowasrzechonek2133>
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         <20190927085208.sxy2x5656ci3opo6@mlowasrzechonek2133>
         <01c84f55db98fbcc2790d11fd6090589881c36cf.camel@intel.com>
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Hi Brian,=20

On Fri, 2019-09-27 at 15:50 +0000, Gix, Brian wrote:
> On Fri, 2019-09-27 at 10:52 +0200, michal.lowas-rzechonek@silvair.com
>  wrote:
> > Inga, Brian,
> >=20
> > Still, even if we add a method, the application is free *not* to
> > implement it, since we agreed back in the day that calls to
> > MessageReceived do not require a response, so any errors would be
> > simply
> > ignored by the daemon.
>=20
> This is not an option.
>=20
> A node does not get to decide which susbscriptions are "valid".  If a
> Virtual Address subscription is added to
> a node, and then a message is sent to that virtua address, the App
> needs to be able to receive it.
>=20
> Yes, any discrete message may be lost, but I don't think we have the
> option of letting *all* virtual addressed
> messages to an App to be ignored.  If we add an App API, it will need
> to be mandatory, which is why I am
> against it.
>=20
> I strongly believe we need:
>=20
> 1. A single method for delivering (non dev key) received messages
> 2. A method that does not require dictionary parsing
>=20
> How are we feeling about:
> void MessageReceived(uint16 source, uint16 key_index,
> array{byte} destination, array{byte} data)
>=20
>=20
> Where destination length of:
> 0 - Unicast address of element
> 2 - Group Address
> 16 - Variable Label
>=20
> I think this fulfills all of our requirements.
>=20

For a single MessageReceived() method, the cleanest way is to have the
subscription address parameter as a variant (suggested by Michal) or as
a dictionary.
An array introduces an extra consideration of byte ordering for group
addresses.

What I mostly about is that the represenation of the subscription
address in the MessageReceived() method corresponds to the
representation in the configuration dictionaries for the Attach() and
UpdateModelConfiguration() methods.
=20

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