Conditional Requests on Connections

Question

We have conditional requests on things- HTTP API or Ditto Protocol headers. Is there a way to restrict payload to get published into a topic in the ditto connections unless a conditional request is matched?

For example, in my twin I have a feature "connectionState" with value "Disconnected". I want to restrict publishing ditto protocol messages to a topic to update other features when the connectionState is Disconnected. Once the connectionState is "Connected", I want all the ditto protocol messages that have been published to update all the other features.

Is there such conditional request for ditto connections?

It would be nice if you could accept and upvote the answers I already have given to your several questions on stackoverflow.com instead of just silently reading them. — Thomas Jäckle, Feb 22 '23 at 08:14
You need at least 15 reputation to cast a vote- which I do not have. I am really grateful to your quick response. :) — apoorva, Feb 28 '23 at 06:28

score 1 · Answer 1 · answered Feb 22 '23 at 08:05

Yes, that can be configured as documented for connection target filters and in combination with requesting extraFields.

E.g.:

{
 "address": "<target-address>",
 "topics": [
   "_/_/things/twin/events?filter=ne(features/connectionState/properties/value,'Disconnected')&extraFields=features/connectionState/properties/value" 
 ],
 "authorizationContext": ["ditto:outbound-auth-subject", "..."]
}

That will publish twin events to the target address only if the connectionState is not Disconnected.

Conditional Requests on Connections

1 Answers1