NewNodeMonitor creates a new NodeMonitor.

DefaultCallbackBufferLen is the size of the internal buffer when using a callback-based subscription.

ErrSlowConsumer is returned when a subscriber does not keep up with the incoming messages.

DataChangeMessage represents the changed DataValue from the server.

Item is a struct to manage Monitored Items.

NodeMonitor creates new subscriptions.

Request is a struct to manage a request to monitor a node.

Subscription is an instance of an active subscription.

ErrHandler is a function that is called when there is an out of band issue with delivery.

MsgHandler is a function that is called for each new DataValue.