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# coding: utf-8 |
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3
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import asyncio |
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5
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from asyncua import Client, ua |
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7
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8
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class SubHandler(object): |
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10
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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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17
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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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async def init(self, ): |
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await self.client.connect() |
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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:ConditionObject' % idx] |
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con_obj = await objects.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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con_handle = await sub.subscribe_events(con_obj, condition) |
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path = ['%s:AlarmObject' % idx] |
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alarm_obj = await objects.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(alarm_obj, alarm) |
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async def start(): |
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client = OpcUaClient("opc.tcp://localhost:4840") |
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await client.init() |
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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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loop.run_forever() |
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FreeOpcUa /
opcua-asyncio
