Re: [6tisch] [core] [CoMI] multiple operations in a single request

On Fri, Jun 26, 2015 at 3:32 PM, Thomas Watteyne <watteyne@eecs.berkeley.edu
> wrote:

> In the 6TiSCH context, CoMI can be used to manage a TSCH schedule, which
> involves adding/removing cells (atomic layer 2 resources).
>
> Cells are represented in the 6top YANG model as a list called "CellList" (
> https://tools.ietf.org/html/draft-ietf-6tisch-6top-interface-03#section-4.1).
> The way CoMI is written now (draft-vanderstok-core-comi-06), one CoMI
> request is needed for each operation. That is, if I want to schedule 10
> cells between nodes A and B, I will need 10 PUT requests to node A, and 10
> to node B. If these are confirmable CoAP packets, that's a lot of packets.
> These will be short requests, but will eat up an enormous amount of
> bandwidth.
>
> I'd like to be able to issue a single request to node A and a single
> request to node B to carry out all of these operations, by aggregating
> multiple "operations" in a single CoMI request (a single/small number of
> CoAP packets).
>
> What does CoMI offer me today to do this? Should we write the YANG model
> in some particular way? What is envisioned in a future revision of CoMI to
> answer this need.
>
>
I think the YANG Patch media type could be used with CoMI.
This allows multiple edits on different target resources.

You could also do a plain PATCH on the datastore root, and provide
the subtrees you want to change.

> Thanks,
> Thomas
>

Andy

>
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