python： opcua通讯

1. opcua 异步订阅通讯

import opcua

global client
global sub
global subHand

client = opcua.Client("opc.tcp://192.168.0.153:49320")


def start():
    client.connect()
    varNode = client.get_node("ns=2;s=S.D.K0")

    handler = SubHandler()

    global sub
    global subHand
    sub = client.create_subscription(1000, handler)
    subHand = sub.subscribe_data_change(varNode)


def end():
    sub.unsubscribe(subHand)
    sub.delete()
    client.disconnect()


class SubHandler(object):
    def data_change(self, handle, node, val, attr):
        print(handle, node, val)


start()

2. opcua 同步通讯

import opcua
import opcua.ua
import time

client = opcua.Client("opc.tcp://192.168.0.153:49320")


def main():
    client.connect()
    # varNode = client.get_node("ns=2;s=S.D.K0")
    # 写值
    # R0 = client.get_node("ns&