async def get_references(self,
refs=ua.ObjectIds.References,
direction=ua.BrowseDirection.Both,
nodeclassmask=ua.NodeClass.Unspecified,
includesubtypes=True):
"""
returns references of the node based on specific filter defined with:
refs = ObjectId of the Reference
direction = Browse direction for references
nodeclassmask = filter nodes based on specific class
includesubtypes = If true subtypes of the reference (ref) are also included
"""
desc = ua.BrowseDescription()
desc.BrowseDirection = direction
desc.ReferenceTypeId = _to_nodeid(refs)
desc.IncludeSubtypes = includesubtypes
desc.NodeClassMask = nodeclassmask
desc.ResultMask = ua.BrowseResultMask.All
desc.NodeId = self.nodeid
params = ua.BrowseParameters()
params.View.Timestamp = ua.get_win_epoch()
params.NodesToBrowse.append(desc)
params.RequestedMaxReferencesPerNode = 0
results = await self.server.browse(params)
references = await self._browse_next(results)
return references
async def browse_nodes(self, nodes):
"""
Browses multiple nodes in one ua call
returns a List of Tuples(Node, BrowseResult)
"""
nodestobrowse = []
for node in nodes:
desc = ua.BrowseDescription()
desc.NodeId = node.nodeid
desc.ResultMask = ua.BrowseResultMask.All
nodestobrowse.append(desc)
parameters = ua.BrowseParameters()
parameters.View = ua.ViewDescription()
parameters.RequestedMaxReferencesPerNode = 0
parameters.NodesToBrowse = nodestobrowse
results = await self.uaclient.browse(parameters)
return list(zip(nodes, results))
