python 实现OPCUA client

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# encoding=utf-8
from opcua import Client
from datetime import datetime
from opcua import ua

def set_value_to_OPC(tagID,value,time_str = None):
    # tagID: 指对应OPCUA　server中点对应的ID号
    # value：需要写入的值
    # time_str:写入值对应的UTC时间,格式为'%Y-%m-%d %H:%M:%S'
    # client = Client("opc.tcp://127.0.0.1:48408/freeopcua/server/")
    # client = Client("opc.tcp://172.16.102.105:48408/freeopcua/server/") #AWS 服务上地址
#通过tagID找到对应的tag，并写入值
    # try:
    #     client.connect()
    #     tagID = tagID
    #     value = value
    #     tag = client.get_node("ns=2;i={}".format(tagID))
    #     if time_str == None:
    #         datavalue = value
    #     else:
    #         datavalue = ua.DataValue(value)
    #         date_time = datetime.strptime(time_str, '%Y-%m-%d %H:%M:%S')
    #         datavalue.SourceTimestamp = date_time
    #     tag.set_value(datavalue)
    #     # v.set_value(i)
    #     client.disconnect()
    # except enumerate as e:
    #     print(e)


    client = Client("opc.tcp://192.168.70.134:62551/DataAccessServer")

    try:
        print(client.connect())
        tagID = tagID
        value = value
        # tag = client.get_node("ns=2;i={}".format(tagID))
        tag = client.get_node("ns=2;s=1:IN7?Value")
        print(tag.get_value())

        # datavalue = ua.DataValue(56)
        # tag.set_value(datavalue)
        # print(tag.get_value())

        dv = ua.DataValue(ua.Variant(125, ua.VariantType.Float))
        #设置值，与数据类型
        dv.ServerTimestamp = None
        dv.SourceTimestamp = None
        tag.set_value(dv)

        # if time_str == None:
        #     datavalue = value
        # else:
        #     datavalue = ua.DataValue(value)
        #     date_time = datetime.strptime(time_str, '%Y-%m-%d %H:%M:%S')
        #     datavalue.SourceTimestamp = date_time
        # tag.set_value(datavalue)

        client.disconnect()
    except enumerate as e:
        print(e)

#默认写入值
# set_value_to_OPC(410,5.6,'2021-10-12 08:06:00')

#指定数据类型写入值
set_value_to_OPC("1:IN7?Value",34)