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# coding: utf-8 |
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from aioconsole import ainput |
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import asyncio |
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from asyncua import Client, ua |
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class SubHandler(object): |
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def datachange_notification(self, node, val, data): |
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print("Python: New data change event", node, val, data) |
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def event_notification(self, event): |
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print("Python new event:", event) |
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class OpcUaClient(object): |
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def __init__(self, endpoint): |
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self.client = Client(endpoint) |
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self.subscriptions = {} |
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async def __aenter__(self): |
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await self.client.connect() |
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return self |
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async def __aexit__(self, exc_type, exc_value, traceback): |
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for sub in self.subscriptions: |
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for handle in self.subscriptions[sub]: |
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await sub.unsubscribe(handle) |
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await sub.delete() |
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await self.client.disconnect() |
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async def init(self): |
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objects = self.client.get_objects_node() |
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idx = await self.client.get_namespace_index("http://examples.freeopcua.github.io") |
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path = ['%s:NotifierObject' % idx] |
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noti_obj = await objects.get_child(path) |
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path = ['%s:ConditionObject' % idx] |
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con_obj = await noti_obj.get_child(path) |
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condition = self.client.get_node(ua.NodeId(2830)) |
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handler = SubHandler() |
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sub = await self.client.create_subscription(500, handler) |
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self.subscriptions[sub] = [] |
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con_handle = await sub.subscribe_events(self.client.nodes.server, condition) |
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self.subscriptions[sub].append(con_handle) |
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path = ['%s:AlarmObject' % idx] |
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alarm_obj = await noti_obj.get_child(path) |
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alarm = self.client.get_node(ua.NodeId(10637)) |
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alarm_handle = await sub.subscribe_events(self.client.nodes.server, alarm) |
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self.subscriptions[sub].append(alarm_handle) |
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60
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async def interactive(client): |
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while True: |
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# exit to disconnect |
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line = await ainput(">>> ") |
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print('execute:', line) |
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if line == 'exit': |
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break |
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try: |
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eval(line) |
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except Exception as msg: |
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print('Exception:', msg) |
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raise Exception |
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async def start(): |
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async with OpcUaClient("opc.tcp://localhost:4840") as client: |
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await client.init() |
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while True: |
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await asyncio.sleep(10) |
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# await interactive(client) |
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if __name__ == '__main__': |
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loop = asyncio.get_event_loop() |
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loop.create_task(start()) |
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try: |
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loop.run_forever() |
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finally: |
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loop.run_until_complete(loop.shutdown_asyncgens()) |
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loop.close() |
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FreeOpcUa /
opcua-asyncio
