Clarify read/writeXproperties in case readOnly or writeOnly properties

[egekorkan]

When a TD has 3 "readOnly": true and 2 "writeOnly":true properties, what happens for read/writeXproperties in the following cases:

• Consumer executes the readallproperties operation. Does the consumer get non readable properties? (I guess no)
• Consumer executes the readmultipleproperties operation with names of non readable properties. Does the Consumer get only the readable properties or an error if possible?
• Consumer executes the writeallproperties or writemultipleproperties operation with names and values of non writeable properties. Would only the writeable properties will be actually writen to in the Exposed Thing?

I think that these cases should be made clear somehow.

[egekorkan]

@mlagally this issue is present also in WoT Architecture, Table 1

[sebastiankb]

recommend to address this in the next charter. Maybe also a topic for "complex interaction" discussion.

[mlagally]

The "writeOnly" properties cause a lot of problems, I suggest we revisit them. See also the discussion in w3c/wot-architecture#412

[sebastiankb]

PR is merged we can close this issue