添加readme, 添加批量读取测试

zhangzengfei

2023-07-18 787cbd888c764c4e17e7c542865426f6c371b05f

添加readme, 添加批量读取测试

 README.md

New file
@@ -0,0 +1,11 @@
#go-plc4x-demo
基于plc4go实现plc设备的读写

plc4x文档地址 https://plc4x.apache.org/users/index.html

#### 运行
```cassandraql
go build
```
####备忘
SubscriptionRequestBuilder 不支持modbus

 main.go

@@ -54,24 +54,37 @@
        return
    }

    readRequest, err := connection.ReadRequestBuilder().AddTagAddress("count", "holding-register:1230:DWORD").Build()
    // 读模式
    readRequest, err := connection.ReadRequestBuilder().AddTagAddress("count", "holding-register:1230:DINT[20]").Build()
    if err != nil {
        fmt.Printf("Error preparing read-request:%s\n", err.Error())
        return
    }

    // 执行
    readResult := <-readRequest.Execute()
    if err := readResult.GetErr(); err != nil {
        fmt.Printf("Error execting read-request:%s\n", err.Error())
        return
    }

    // Do something with the response
    // 判断响应码是否正确
    if readResult.GetResponse().GetResponseCode("count") != apiModel.PlcResponseCode_OK {
        fmt.Printf("error an non-ok return code: %s", readResult.GetResponse().GetResponseCode("tag").GetName())
        fmt.Printf("error an non-ok return code: %s", readResult.GetResponse().GetResponseCode("count").GetName())
        return
    }

    // 测试获取变量名称
    //names := readResult.GetResponse().GetTagNames()
    //fmt.Printf("Got tag names %+v", names)

    value := readResult.GetResponse().GetValue("count")
    fmt.Printf("Got result %d\n", value.GetUint32())
    fmt.Printf("Got result length %d\n", value.GetLength())

    // 按字符串打印变量
    fmt.Printf("val data: %s\n", value.GetRaw())
    for _, val := range value.GetList() {
        fmt.Printf("%d ", val.GetUint16())
    }

}