update

.gitignore

@@ -0,0 +1 @@
+env

client/browse.py

@@ -8,34 +8,33 @@
 async def main():
     client = Client(url="opc.tcp://127.0.0.1:48010", timeout=8)
     await client.connect()
+    obj = client.get_objects_node()
 
     print("-----------------------------------------------------")
     # get the references of a single node
-    obj = client.get_objects_node()
     refs = await obj.get_references()
-    children = []
-    type_definitions = []
+    organizes = []
+    typedefinitions = []
     print(f"Node-Id {obj} has following References:")
     for ref in refs:
         print(ref)
         if ref.ReferenceTypeId.Identifier == ua.ObjectIds.Organizes:
             # Organizes = 35
-            children.append(ref)
+            organizes.append(ref)
         elif ref.ReferenceTypeId.Identifier == ua.ObjectIds.HasTypeDefinition:
             # HasTypeDefinition = 40
-            type_definitions.append(ref)
+            typedefinitions.append(ref)
         else:
             pass
     print("-----------------------------------------------------")
     print(f"Node-Id {obj} has following Childnodes:")
-    for child in children:
-        print(child.BrowseName.Name)
+    for each in organizes:
+        print(each.BrowseName.Name)
     print("-----------------------------------------------------")
     print(f"Node-Id {obj} is from Type:")
-    for type_definition in type_definitions:
-        print(type_definition.BrowseName.Name)
+    for each in typedefinitions:
+        print(each.BrowseName.Name)
 
-    print("-----------------------------------------------------")
     await client.disconnect()
 
 if __name__ == "__main__":

client/call_method.py

@@ -1 +1,25 @@
-# coming soon!
+import asyncio
+import logging
+from asyncua import Client, ua
+
+logging.basicConfig(level=logging.WARNING)
+_logger = logging.getLogger('asyncua')
+
+async def main():
+    client = Client(url="opc.tcp://127.0.0.1:48010", timeout=8)
+    await client.connect()
+
+    method_parent = client.get_node("ns=7;s=Demo.CTT.Methods")
+    method_node = client.get_node("ns=7;s=Demo.CTT.Methods.MethodIO") # the method just adds two Int32 numbers
+
+    # always specify the correct VariantType! 
+    inarg1 = ua.Variant(20, ua.VariantType.UInt32) 
+    inarg2 = ua.Variant(13, ua.VariantType.UInt32)
+
+    result = await method_parent.call_method(method_node, inarg1, inarg2) # the order of args matters!
+    print(result)
+
+    await client.disconnect()
+
+if __name__ == "__main__":
+    asyncio.run(main())

client/read.py

@@ -12,18 +12,18 @@ async def main():
     print("-----------------------------------------------------")
     # read one node attribute at a time
     node = client.get_node("ns=0;i=2267") # ServiceLevel
-    print("Value: ", await node.read_value())
-    print("DataValue: ", await node.read_data_value())
-    print("BrowseName: ", await node.read_browse_name())
-    print("DataType: ", await node.read_data_type())
-    print("DisplayName: ", await node.read_display_name())
+    print("Value: ", await node.read_value()) # returns just the Value
+    print("DataValue: ", await node.read_data_value()) # returns the DataValue (Value + StatusCode + Timestamps)
+    print("BrowseName: ", await node.read_browse_name()) # returns the BrowseName ("0:ServiceLevel")
+    print("DataType: ", await node.read_data_type()) # returns the DataType of the Value (i=3 -> Byte)
+    print("DisplayName: ", await node.read_display_name()) # returns the DisplayName in form of LocalizedText
 
     print("-----------------------------------------------------")
-    # read multiple node attributes at once
+    # read multiple node attributes at once (HighLevel)
     print("ReadValues:")
     result = await client.read_values([
-        client.get_node("ns=0;i=2267"), 
-        client.get_node("ns=0;i=2256")
+        client.get_node("ns=0;i=2267"), # Node-Class
+        client.get_node("ns=0;i=2256")  # Node-Class
         # ...
     ])
     for res in result:
@@ -32,36 +32,39 @@ async def main():
     print("-----------------------------------------------------")  
     print("ReadAttributeValues:")
     result = await client.uaclient.read_attributes([
-        client.get_node("ns=0;i=2267").nodeid, 
-        client.get_node("ns=0;i=2256").nodeid
+        ua.NodeId.from_string("ns=0;i=2267"), # NodeId-Class
+        ua.NodeId.from_string("ns=0;i=2256")  # NodeId-Class
         # ...
         ], 
         ua.AttributeIds.Value
     )
+    # read_attributes returns a list of DataValue-Class instances (Value + StatusCode + Timestamps) which represent the Values
     for res in result:
         print(res)
 
     print("-----------------------------------------------------")
     print("ReadBrowseNames:")
     result = await client.uaclient.read_attributes([
-        client.get_node("ns=0;i=2267").nodeid, 
-        client.get_node("ns=0;i=2256").nodeid
+        ua.NodeId.from_string("ns=0;i=2267"), # NodeId-Class
+        ua.NodeId.from_string("ns=0;i=2256")  # NodeId-Class
         # ...
         ], 
         ua.AttributeIds.BrowseName
     )
+    # read_attributes returns a list of DataValue-Class instances (Value + StatusCode + Timestamps) which represent the BrowseNames
     for res in result:
         print(res)
 
     print("-----------------------------------------------------")
     print("ReadDataTypes:")
     result = await client.uaclient.read_attributes([
-        client.get_node("ns=0;i=2267").nodeid, 
-        client.get_node("ns=0;i=2256").nodeid
+        ua.NodeId.from_string("ns=0;i=2267"), # NodeId-Class
+        ua.NodeId.from_string("ns=0;i=2256")  # NodeId-Class
         # ...
         ], 
         ua.AttributeIds.DataType
     )
+    # read_attributes returns a list of DataValue-Class instances (Value + StatusCode + Timestamps) which represent the DataTypes
     for res in result:
         print(res)
 

requirements.txt

@@ -0,0 +1,11 @@
+aiofiles==0.7.0
+aiosqlite==0.17.0
+asyncua==0.9.14
+cffi==1.14.5
+cryptography==3.4.7
+pycparser==2.20
+python-dateutil==2.8.1
+pytz==2021.1
+six==1.16.0
+sortedcontainers==2.4.0
+typing-extensions==3.10.0.0