Considering a connector that has multiple smart-serial connections.
If we implement a response without any specific options="Connection:x" field, what is the expected behavior?
Will this response by default get only responses from the main connection (id = 0), or will it be able to retrieve responses from any of the configured connection as well?
Although it is not exactly the same setup, this article might already provide you some good insights on best practices:
How to define serial and smart-serial responses in one and the same driver - DataMiner Dojo
The "How to" clearly states to always add the connection Id. I would suggest you do the same when working with multiple smart-serial connections. This way you are sure how everything will behave.