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Re: [core] WGA of draft-dijk-core-groupcomm-bis-03

Achim Kraus <achimkraus@gmx.net> Fri, 20 March 2020 08:37 UTC

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From: Achim Kraus <achimkraus@gmx.net>
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Date: Fri, 20 Mar 2020 09:36:51 +0100
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Subject: Re: [core] WGA of draft-dijk-core-groupcomm-bis-03
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Hello list,

the draft "draft-dijk-core-groupcomm-bis-03" mention in
2.1 Group Definition

"An endpoint may be a member of multiple CoAP groups by subscribing to
multiple IP multicast groups."

At least for java, we (Eclipse Californium) didn't find a way for the
server-side, to determine, for which multicast group the message was
received. We even didn't find a way to distinguish on the server-side,
if the message was received through a multicast group or uni-cast
address. An approach, which uses "many ports", and so different
endpoints, has it's downsides (the document mentions them).
To overcome that for a "private deployment", I started to use the
"Uri-Host" option to send he destination "multicast group" as convention.

Maybe, if group communication gets more elaborated, the core wg consider
to spend a specific (new) option "multicast-group" in order to make it
easier/possible, to implement a proper server-side.

best regards
Achim Kraus

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