Address Space Browsing

Address space browsing is done with the ‘browse’ method. Both the client and server have this method.

The browse method accepts three parameter types:

String with node ID
Array of strings with Node ID
Table with detailed parameters

These parameters are described in section browseParameters.

Method browse returns browseResult

Browsing by String NodeID

To browse a single node, you need to pass a string with node ID into the browse Method:

-- Browse one node by ID.
resp, err = client:browse(RootFolder)

Full source

To browse several nodes at once, you can pass an array of nodeIDs as follows:

-- Browse array of Node IDs.
resp, err = client:browse({RootFolder, TypesFolder})

Full source

Browsing a node by ID sends a request to the server with the following parameters:

Follow Hierarchical references in forward direction

Node class mask - All node classes

Result mask - all attributes

Detailed Parameters

For special cases, you can manually set the browse parameters as shown in the following example:

local browseParams = {
  NequestedMaxReferencesPerNode = 0,
  NodesToBrowse = {
    {
      NodeId = RootFolder,
      ReferenceTypeId = HierarchicalReferences,
      BrowseDirection = ua.Types.BrowseDirection.Forward,
      NodeClassMask = ua.Types.NodeClass.Unspecified,
      ResultMask = ua.Types.BrowseResultMask.All,
      IncludeSubtypes = true,
    },
    {
      NodeId = TypesFolder,
      ReferenceTypeId = HierarchicalReferences,
      BrowseDirection = ua.Types.BrowseDirection.Forward,
      NodeClassMask = ua.Types.NodeClass.Unspecified,
      ResultMask = ua.Types.BrowseResultMask.All,
      IncludeSubtypes = true,
    }
  },
}

local resp,err = client:browse(browseParams)
for _,res in ipairs(resp.Results) do
  if res.StatusCode ~= ua.StatusCode.Good then
    trace(string.format("Cannot browse node: 0x%X", res.StatusCode))
  else
    trace("References:")
    for i,ref in ipairs(res.References) do
      trace(string.format("%d: NodeId=%s Name=%s", i, ref.NodeId, ref.DisplayName.text))
    end
  end
end

Full source