def server():
s = Server()
s.set_endpoint('opc.tcp://0.0.0.0:8840/freeopcua/server/')
uri = "http://examples.freeopcua.github.io"
idx = s.register_namespace(uri)
myobj = s.nodes.objects.add_object(idx, "MyObject")
myvar = myobj.add_variable(idx, "MyVariable", 6.7)
mysin = myobj.add_variable(idx, "MySin", 0, ua.VariantType.Float)
s.start()
yield s
s.stop()
class ServerPython(object):
def __init__(self):
self._server = None
self.nodes = None
self.get_node = None
self.get_namespace_array = None
def get_server(self):
return self._server
def start_server(self, endpoint):
logger.info("Starting python-opcua server")
self._server = Server()
self._server.set_endpoint(endpoint)
self._server.set_server_name("OpcUa Modeler Server")
self.nodes = self._server.nodes
self.get_node = self._server.get_node
self.get_namespace_array = self._server.get_namespace_array
self.load_type_definitions = self._server.load_type_definitions
self.load_enums = self._server.load_enums
# now remove freeopcua namespace, not necessary when modeling and
# ensures correct idx for exported nodesets
ns_node = self._server.get_node(
ua.NodeId(ua.ObjectIds.Server_NamespaceArray))
nss = ns_node.read_value()
ns_node.write_value(nss[:1])
self._server.start()
def stop_server(self):
if self._server is not None:
self._server.stop()
self._server = None
self.get_node = None
self.get_namespace_array = None
def import_xml(self, path):
return self._server.import_xml(path)
def export_xml(self, nodes, uris, path):
exp = XmlExporter(self._server)
exp.build_etree(nodes, uris=uris)
exp.write_xml(path)
# creating a default event object
# The event object automatically will have members for all events properties
# you probably want to create a custom event type, see other examples
myevgen = server.get_event_generator()
myevgen.event.Severity = 300
# starting!
server.start()
print("Available loggers are: ", logging.Logger.manager.loggerDict.keys())
vup = VarUpdater(mysin) # just a stupide class update a variable
vup.start()
try:
# enable following if you want to subscribe to nodes on server side
#handler = SubHandler()
#sub = server.create_subscription(500, handler)
#handle = sub.subscribe_data_change(myvar)
# trigger event, all subscribed clients wil receive it
var = myarrayvar.get_value() # return a ref to value in db server side! not a copy!
var = copy.copy(var) # WARNING: we need to copy before writting again otherwise no data change event will be generated
var.append(9.3)
myarrayvar.set_value(var)
mydevice_var.set_value("Running")
myevgen.trigger(message="This is BaseEvent")
server.set_attribute_value(myvar.nodeid, ua.DataValue(9.9)) # Server side write method which is a but faster than using set_value
embed()
finally:
vup.stop()
server.stop()
stop_thread_loop()
def server():
s = Server()
s.set_endpoint('opc.tcp://*:8840/freeopcua/server/')
s.start()
yield s
s.stop()