Hi Thomas,
the latest (not published yet) version includes the use of the PATCH
command.
There is a RFC on JSON patch, we could refer to that in the PATCH I-D.
Further link-format is sufficient, no?
The number of items in the payload depends on the the server.
If large strings need to be replaced, the size is quickly large.
I was thinking of just using JSON CBOR with payloads like:
{ hash1: value1,
hash2: value2}
and changing individual list items.
I don't know about YANG PATCH media type.
Peter
Thomas Watteyne schreef op 2015-06-27 10:49:
Andy,
Thanks. https://tools.ietf.org/html/draft-vanderstok-core-comi-06 now
says:
[p4] TODO: Introduce CoAP Patch options to allow modification to
subsets of resource.
[p24] TODO: Define where PATCH is needed.
I assume that you are introducing PATCH in -07. Can you quantify how
lightweight this will be, e.g. how many cells can I add/remove in a
single packet?
Thomas
On Sat, Jun 27, 2015 at 12:51 AM, Andy Bierman <[email protected]>
wrote:
On Fri, Jun 26, 2015 at 3:32 PM, Thomas Watteyne
<[email protected]> 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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