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import sys |
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sys.path.insert(0, "..") |
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import logging |
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import time |
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5
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6
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try: |
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from IPython import embed |
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except ImportError: |
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import code |
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def embed(): |
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vars = globals() |
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vars.update(locals()) |
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shell = code.InteractiveConsole(vars) |
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shell.interact() |
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from opcua import Client |
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from opcua import ua |
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class SubHandler(object): |
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""" |
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Subscription Handler. To receive events from server for a subscription |
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data_change and event methods are called directly from receiving thread. |
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Do not do expensive, slow or network operation there. Create another |
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thread if you need to do such a thing |
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""" |
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def datachange_notification(self, node, val, data): |
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print("Python: New data change event", node, val) |
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34
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def event_notification(self, event): |
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print("Python: New event", event) |
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def status_change_notification(self, status): |
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print ("Python: New status change", status) |
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40
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if __name__ == "__main__": |
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logging.basicConfig(level=logging.WARN) |
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#logger = logging.getLogger("KeepAlive") |
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#logger.setLevel(logging.DEBUG) |
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#client = Client("opc.tcp://localhost:4840/freeopcua/server/") |
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client = Client("opc.tcp://admin@localhost:4840/freeopcua/server/") #connect using a user |
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48
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try: |
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client.connect() |
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50
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# Client has a few methods to get proxy to UA nodes that should always be in address space such as Root or Objects |
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root = client.get_root_node() |
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print("Root node is: ", root) |
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objects = client.get_objects_node() |
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print("Objects node is: ", objects) |
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# Node objects have methods to read and write node attributes as well as browse or populate address space |
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print("Children of root are: ", root.get_children()) |
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# get a specific node knowing its node id |
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#var = client.get_node(ua.NodeId(1002, 2)) |
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#var = client.get_node("ns=3;i=2002") |
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#print(var) |
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#var.get_data_value() # get value of node as a DataValue object |
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#var.get_value() # get value of node as a python builtin |
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#var.set_value(ua.Variant([23], ua.VariantType.Int64)) #set node value using explicit data type |
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#var.set_value(3.9) # set node value using implicit data type |
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# Now getting a variable node using its browse path |
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myvar = root.get_child(["0:Objects", "2:MyObject", "2:MyVariable"]) |
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obj = root.get_child(["0:Objects", "2:MyObject"]) |
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print("myvar is: ", myvar) |
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# subscribing to a variable node |
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handler = SubHandler() |
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sub = client.create_subscription(500, handler) |
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handle = sub.subscribe_data_change(myvar) |
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time.sleep(0.1) |
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80
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# we can also subscribe to events from server |
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sub.subscribe_events() |
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# sub.unsubscribe(handle) |
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# sub.delete() |
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85
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# calling a method on server |
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res = obj.call_method("2:multiply", 3, "klk") |
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print("method result is: ", res) |
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89
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print("Children of MyObject are: ", obj.get_children()) |
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print("myvar should be still there") |
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deletenode = ua.DeleteNodesItem() |
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deletenode.NodeId = obj.get_child(["2:MyVariable"]).nodeid |
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deletenode.DeleteTargetReferences = True |
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results = client.bclient.delete_nodes([deletenode]) |
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results[0].check() |
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print("Children of MyObject are: ", obj.get_children()) |
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print("myvar should disapear") |
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98
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99
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embed() |
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100
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finally: |
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101
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client.disconnect() |
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102
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FreeOpcUa /
python-opcua
