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例子：
1 import sys
2 sys.path.insert(0, "..")
3 import time
4
5
6 from opcua import ua, Server
7
8
9 if __name__ == "__main__":
10
11 # setup our server
12 server = Server()
13 server.set_endpoint("opc.tcp://0.0.0.0:4840/freeopcua/server/")
14
15 # setup our own namespace, not really necessary but should as spec
16 uri = "http://examples.freeopcua.github.io"
17 idx = server.register_namespace(uri)
18
19 # get Objects node, this is where we should put our nodes
20 objects = server.get_objects_node()
21
22 # populating our address space
23 myobj = objects.add_object(idx, "MyObject")
24 myvar = myobj.add_variable(idx, "MyVariable", 6.7)
25 myvar.set_writable() # Set MyVariable to be writable by clients
26
27 # starting!
28 server.start()
29
30 try:
31 count = 0
32 while True:
33 time.sleep(1)
34 count += 0.1
35 myvar.set_value(count)
36 finally:
37 #close connection, remove subcsriptions, etc
38 server.stop()
1 import sys
2 sys.path.insert(0, "..")
3
4
5 from opcua import Client
6
7
8 if __name__ == "__main__":
9
10 client = Client("opc.tcp://localhost:4840/freeopcua/server/")
11 # client = Client("opc.tcp://admin@localhost:4840/freeopcua/server/") #connect using a user
12 try:
13 client.connect()
14
15 # Client has a few methods to get proxy to UA nodes that should always be in address space such as Root or Objects
16 root = client.get_root_node()
17 print("Objects node is: ", root)
18
19 # Node objects have methods to read and write node attributes as well as browse or populate address space
20 print("Children of root are: ", root.get_children())
21
22 # get a specific node knowing its node id
23 #var = client.get_node(ua.NodeId(1002, 2))
24 #var = client.get_node("ns=3;i=2002")
25 #print(var)
26 #var.get_data_value() # get value of node as a DataValue object
27 #var.get_value() # get value of node as a python builtin
28 #var.set_value(ua.Variant([23], ua.VariantType.Int64)) #set node value using explicit data type
29 #var.set_value(3.9) # set node value using implicit data type
30
31 # Now getting a variable node using its browse path
32 myvar = root.get_child(["0:Objects", "2:MyObject", "2:MyVariable"])
33 obj = root.get_child(["0:Objects", "2:MyObject"])
34 print("myvar is: ", myvar)
35 print("myobj is: ", obj)
36
37 # Stacked myvar access
38 # print("myvar is: ", root.get_children()[0].get_children()[1].get_variables()[0].get_value())
39
40 finally:
41 client.disconnect()
