Christopher Collins created MYNEWT-647:
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Summary: Changes to NMP over OIC scheme
Key: MYNEWT-647
URL: https://issues.apache.org/jira/browse/MYNEWT-647
Project: Mynewt
Issue Type: Bug
Components: Newtmgr
Reporter: Christopher Collins
Assignee: Christopher Collins
Fix For: v1_0_0_rel
h4. Current Scheme
h5. Requests
The NMP op is indicated by the OIC op:
NMP read <=> OIC get
NMP write <=> OIC put
The NMP group and ID are indicated as CoAP URI Query options:
* {{gr=<group>}}
* {{id=<id>}}
The remaining NMP header fields, seq and flags, are not present.
The payload is the CBOR encoding the the request body. This is identical to
the body of a plain NMP request.
h5. Responses
The NMP header is not present. The NMP op is indicated in the payload (see
below), but other header fields cannot be inferred.
Payload consists of a single CBOR key-value pair. For read resonses, the key
is "r"; for write responses, the key is "w". The value is a second CBOR map
containing the actual NMP response fields.
h4. Proposed Scheme
h5. Requests
* The OIC op is always the same: put.
* No URI Query CoAP options.
* The NMP header is included in the payload as a key-value pair (key="_h").
This pair is in the root map of the request and is a sibling of the other
request fields. The value of this pair is the big-endian eight-byte NMP header
with a length field of 0.
h5. Responses
* As with requets, the NMP header is included in the payload as a key-value
pair (key="_h").
* No "r" or "w" field. The response fields are inserted into the root map as a
sibling of the "_h" pair.
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