A question about funtion "buildnode " in opcua driver

Module Development
1

when the ua dirver call the function buildNode(String address, NodeId nodeId)?please give me more detailed information about this function.

2

You should already have javadocs for this one:

	/**
	 * <p>
	 * Build the appropriate node for the given address. It is guaranteed that
	 * {@link #buildNode(String, NodeId)} will not be called until {@link #getDriverState()} returns
	 * {@link DriverState#Connected}.
	 * </p>
	 * 
	 * <p>
	 * If for any reason the node cannot be built {@link AddressNotFoundException} should be thrown.
	 * </p>
	 * 
	 * @param address
	 *            Address of the node that is to be built.
	 * 
	 * @param nodeId
	 *            The {@link NodeId} to use when building the {@link Node} for this address.
	 * 
	 * @throws AddressNotFoundException
	 */

Every address on a driver that someone reads from, writes to, or subscribes to, needs to have an equivalent UA node in the address space. By default these are created lazily, when they are finally needed, not all at once before the driver starts.

This is the server telling you to use the NodeManager and NodeBuilderFactory to build a Node for the given address, using the given NodeId.

You can look at the Modbus driver included in the 7.3.x SDK for an example of how this is implemented.