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165 lines (135 loc) · 6.09 KB
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import uuid
from threading import Thread
import copy
import logging
from datetime import datetime
import time
from math import sin
import sys
from opcua.ua import NodeId, NodeIdType
sys.path.insert(0, "..")
try:
from IPython import embed
except ImportError:
import code
def embed():
myvars = globals()
myvars.update(locals())
shell = code.InteractiveConsole(myvars)
shell.interact()
from opcua import ua, uamethod, Server
class SubHandler(object):
"""
Subscription Handler. To receive events from server for a subscription
"""
def datachange_notification(self, node, val, data):
print("Python: New data change event", node, val)
def event_notification(self, event):
print("Python: New event", event)
# method to be exposed through server
def func(parent, variant):
ret = False
if variant.Value % 2 == 0:
ret = True
return [ua.Variant(ret, ua.VariantType.Boolean)]
# method to be exposed through server
# uses a decorator to automatically convert to and from variants
@uamethod
def multiply(parent, x, y):
print("multiply method call with parameters: ", x, y)
return x * y
class VarUpdater(Thread):
def __init__(self, var):
Thread.__init__(self)
self._stopev = False
self.var = var
def stop(self):
self._stopev = True
def run(self):
while not self._stopev:
v = sin(time.time() / 10)
self.var.set_value(v)
time.sleep(0.1)
if __name__ == "__main__":
# optional: setup logging
logging.basicConfig(level=logging.WARN)
#logger = logging.getLogger("opcua.address_space")
# logger.setLevel(logging.DEBUG)
#logger = logging.getLogger("opcua.internal_server")
# logger.setLevel(logging.DEBUG)
#logger = logging.getLogger("opcua.binary_server_asyncio")
# logger.setLevel(logging.DEBUG)
#logger = logging.getLogger("opcua.uaprocessor")
# logger.setLevel(logging.DEBUG)
# now setup our server
server = Server()
#server.disable_clock()
#server.set_endpoint("opc.tcp://localhost:4840/freeopcua/server/")
server.set_endpoint("opc.tcp://0.0.0.0:4840/freeopcua/server/")
server.set_server_name("FreeOpcUa Example Server")
# set all possible endpoint policies for clients to connect through
server.set_security_policy([
ua.SecurityPolicyType.NoSecurity,
ua.SecurityPolicyType.Basic256Sha256_SignAndEncrypt,
ua.SecurityPolicyType.Basic256Sha256_Sign])
# setup our own namespace
uri = "http://examples.freeopcua.github.io"
idx = server.register_namespace(uri)
# create a new node type we can instantiate in our address space
dev = server.nodes.base_object_type.add_object_type(idx, "MyDevice")
dev.add_variable(idx, "sensor1", 1.0).set_modelling_rule(True)
dev.add_property(idx, "device_id", "0340").set_modelling_rule(True)
ctrl = dev.add_object(idx, "controller")
ctrl.set_modelling_rule(True)
ctrl.add_property(idx, "state", "Idle").set_modelling_rule(True)
# populating our address space
# First a folder to organise our nodes
myfolder = server.nodes.objects.add_folder(idx, "myEmptyFolder")
# instanciate one instance of our device
mydevice = server.nodes.objects.add_object(idx, "Device0001", dev)
mydevice_var = mydevice.get_child(["{}:controller".format(idx), "{}:state".format(idx)]) # get proxy to our device state variable
# create directly some objects and variables
myobj = server.nodes.objects.add_object(idx, "MyObject")
myvar = myobj.add_variable(idx, "MyVariable", 6.7)
mysin = myobj.add_variable(idx, "MySin", 0, ua.VariantType.Float)
myvar.set_writable() # Set MyVariable to be writable by clients
mystringvar = myobj.add_variable(idx, "MyStringVariable", "Really nice string")
mystringvar.set_writable() # Set MyVariable to be writable by clients
myguidvar = myobj.add_variable(NodeId(uuid.UUID('1be5ba38-d004-46bd-aa3a-b5b87940c698'), idx, NodeIdType.Guid),
'MyStringVariableWithGUID', 'NodeId type is guid')
mydtvar = myobj.add_variable(idx, "MyDateTimeVar", datetime.utcnow())
mydtvar.set_writable() # Set MyVariable to be writable by clients
myarrayvar = myobj.add_variable(idx, "myarrayvar", [6.7, 7.9])
myarrayvar = myobj.add_variable(idx, "myStronglytTypedVariable", ua.Variant([], ua.VariantType.UInt32))
myprop = myobj.add_property(idx, "myproperty", "I am a property")
mymethod = myobj.add_method(idx, "mymethod", func, [ua.VariantType.Int64], [ua.VariantType.Boolean])
multiply_node = myobj.add_method(idx, "multiply", multiply, [ua.VariantType.Int64, ua.VariantType.Int64], [ua.VariantType.Int64])
# import some nodes from xml
server.import_xml("custom_nodes.xml")
# 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()