OptionalpollShadow GET poll interval. Default: DEFAULT_NODE_ONLINE_POLL_INTERVAL_MS.
OptionalsubgroupSubgroup (room/CG) ids that currently contain the node.
Omitted or empty ⇒ home-only shadow params-{groupId} (legacy callers).
When set, shadow is params-{groupId}-{sortedSubgroupIds}.
OptionaltimeoutLogged-in user; used to connect MQTT if not already connected.
Group the node was associated with during provisioning (drives shadow name).