opcua 写值失败的问题

[alongL]

mappers\opcua\driver\client.go
Set的时候所写的opcua节点的属性必须是String类型的才可以成功。
如果opcua节点的是Int32的，此时Set会失败。
参考：gopcua/opcua#310

func (c *OPCUAClient) Set(nodeID string, value string) (results string, err error) {
    ///...

	v, err := ua.NewVariant(value) //type of value is string
	if err != nil {
		klog.Errorf("invalid value: %v", err)
		return "", errors.New("Invalid value")
	}

	req := &ua.WriteRequest{
		NodesToWrite: []*ua.WriteValue{  // WriteValue failed if the type of node is not string.
			{
				NodeID:      id,
				AttributeID: ua.AttributeIDValue,
				Value: &ua.DataValue{
					EncodingMask: ua.DataValueValue,
					Value:        v,
				},
			},
		},
	}

	resp, err := c.Client.Write(req)

此处想写一个Int32的Node必须这样写：

func (c *OPCUAClient) Set(nodeID string, value string) (results string, err error) {
   ....
       // convert string to int32
	value64, err := strconv.ParseInt(value, 10, 32)
	if err != nil {
		klog.Errorf("value convert failed : %v", err)
	}
        var val32 int32
	val32 = int32(value64)
	//v, err := ua.NewVariant(value)
	v, err := ua.NewVariant(val32)  
      ...

如果运行gopcua自带的demo，写一个Int32型变量，也是一样的问题

go run examples/write/write.go -endpoint opc.tcp://192.168.1.228:4840  -node 'ns=1;s=start' -value 0
The value supplied for the attribute is not of the same type as the attribute's value. StatusBadTypeMismatch (0x80740000)

[sailorvii]

Yes, you're right. The value transfer could be added at https://github.com/kubeedge/mappers-go/blob/b03f2300763bf4beb0c81ce2829052ffacea9129/mappers/opcua/device/device.go line 41