command property
Command is what was asked, from a closed four: pause, resume, stop, message. It is an INTENT — the poller decides what to do about it, and the session's status changes only when the poller reports back that it did.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? command;