Merge pull request #176 from iirob/master

Example update and new client-events example

examples/client-events.py

+import sys
+sys.path.insert(0, "..")
+
+try:
+    from IPython import embed
+except ImportError:
+    import code
+
+    def embed():
+        vars = globals()
+        vars.update(locals())
+        shell = code.InteractiveConsole(vars)
+        shell.interact()
+
+
+from opcua import Client
+
+
+class SubHandler(object):
+
+    """
+    Subscription Handler. To receive events from server for a subscription
+    data_change and event methods are called directly from receiving thread.
+    Do not do expensive, slow or network operation there. Create another
+    thread if you need to do such a thing
+    """
+    def event_notification(self, event):
+        print("New event recived: ", event)
+
+
+if __name__ == "__main__":
+
+    client = Client("opc.tcp://localhost:4840/freeopcua/server/")
+    # client = Client("opc.tcp://admin@localhost:4840/freeopcua/server/") #connect using a user
+    try:
+        client.connect()
+
+        # Client has a few methods to get proxy to UA nodes that should always be in address space such as Root or Objects
+        root = client.get_root_node()
+        print("Objects node is: ", root)
+
+        # Now getting a variable node using its browse path
+        obj = root.get_child(["0:Objects", "2:MyObject"])
+        print("MyObject is: ", obj)
+
+        myevent = root.get_child(["0:Types", "0:EventTypes", "0:BaseEventType", "2:MyFirstEvent"])
+        print("MyFirstEventType is: ", myevent)
+
+        msclt = SubHandler()
+        sub = client.create_subscription(100, msclt)
+        handle = sub.subscribe_events(obj, myevent)
+
+        embed()
+        sub.unsubscribe(handle)
+        sub.delete()
+    finally:
+        client.disconnect()

examples/server-events.py

 import sys
 import logging
 
+try:
+    from IPython import embed
+except ImportError:
+    import code
+
+    def embed():
+        vars = globals()
+        vars.update(locals())
+        shell = code.InteractiveConsole(vars)
+        shell.interact()
+
 from opcua import ua, Server
 
 
@@ -42,12 +53,12 @@ if __name__ == "__main__":
     try:
         # time.sleep is here just because we want to see events in UaExpert
         import time
-        time.sleep(10)
-
-        myevgen.trigger(message="This is MyFirstEvent with MyNumericProperty and MyStringProperty.")
-        mysecondevgen.trigger(message="This is MySecondEvent with MyIntProperty and MyBoolProperty.")
+        for i in range(1, 10):
+            time.sleep(10)
+            myevgen.trigger(message="This is MyFirstEvent with MyNumericProperty and MyStringProperty.")
+            mysecondevgen.trigger(message="This is MySecondEvent with MyIntProperty and MyBoolProperty.")
 
-        time.sleep(20)
+        embed()
     finally:
         #close connection, remove subcsriptions, etc
         server.stop()

examples/server-example.py

@@ -14,7 +14,7 @@ except ImportError:
         shell.interact()
 
 
-from opcua import ua, uamethod, Server, EventGenerator
+from opcua import ua, uamethod, Server
 
 
 class SubHandler(object):
@@ -92,7 +92,8 @@ if __name__ == "__main__":
 
     # creating an event object
     # The event object automatically will have members for all events properties
-    myevgen = server.get_event_generator(ua.BaseEvent(message="This is BaseEvent", severity=300))
+    myevgen = server.get_event_generator()
+    myevgen.event.Severity = 300
 
     # starting!
     server.start()
@@ -103,7 +104,7 @@ if __name__ == "__main__":
         #sub = server.create_subscription(500, handler)
         #handle = sub.subscribe_data_change(myvar)
         # trigger event, all subscribed clients wil receive it
-        myevgen.trigger()
+        myevgen.trigger(message="This is BaseEvent")
 
         embed()
     finally: