from opcua import ua, Server
import time
import random

if __name__ == "__main__":
    server = Server()
    # 設定端點（本機：4840）
    server.set_endpoint("opc.tcp://0.0.0.0:4840")
    server.set_server_name("MyUA Server")

    # 新增命名空間（回傳 nsIndex）
    idx = server.register_namespace("urn:mycompany:demo")

    # 建立地址空間：一個 Object，底下放一個 Variable
    objects     = server.get_objects_node()
    myobj       = objects.add_object(idx, "DemoObject")

    #空間建好，可以設變數了
    temp_var    = myobj.add_variable(idx, "Temperature", 25.0)  # 初值 25.0
    A           = myobj.add_variable(idx, "A_value", 1)

    #變數設好，打開Client寫入功能
    temp_var.set_writable()  # 允許 Client 寫入
    A.set_writable()         # 允許 Client 寫入

    # 啟動 Server
    server.start()
    print("Server started at opc.tcp://localhost:4840")

    x=0
    try:
        while True:
            # 模擬溫度改變
            new_value = 20.0 + random.random() * 10.0
            temp_var.set_value(ua.Variant(new_value, ua.VariantType.Float))
            x=x+1
            A.set_value(ua.Variant(x, ua.VariantType.Int64))
            print(A.get_value())
            print(temp_var.get_value())
            time.sleep(1)
    except KeyboardInterrupt:
        print("Server stopped by user")
    finally:
        server.stop()
        print("Resources released, server closed")