golang:ioutil.ReadAll()的网络响应为空,对等体重置连接

I'm trying to test out performing a simple TCP MODBUS read of a single register from a device emulator. When running the code it is showing a response of 0 bytes and I get the message "connection reset by peer". Any ideas as to why it's not working?

UPDATE, my request was incorrect, the correct working MODBUS TCP poll code is:

package main

import (
    "fmt"
    "net"
)

// TCP MODBUS client
func main() {
    conn, err := net.Dial("tcp", "192.168.98.114:502")
    if err != nil {
        fmt.Println(err)
    }
    numRegs := 1
    # make a MODBUS TCP request (be careful, the format is different to MODBUS serial)
    request := []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x01, 0x03, 0x00, 0x01, 0x00, 0x01}
    n, err := conn.Write(request)
    if err != nil {
        fmt.Println(err)
    }
    expectedResponseLen := 5 + 2 * numRegs
    response := make([]byte, expectedResponseLen)
    n, err = conn.Read(response)
    conn.Close()
    if err != nil {
        fmt.Println(err)
    }
    for i := 0; i < n; i++ {
        fmt.Printf("%02x ", response[i])
    }
    fmt.Println("
")
}
dsorecdf78171
dsorecdf78171 谢谢汤姆,我的请求格式错误,正确的代码在上面。
6 年多之前 回复
duanjue9296
duanjue9296 由对等方重置连接通常意味着客户端接受了连接但在收到您的请求后挂断了。也许请求有问题?(此外,我认为您打算使用fmt.Fprint)
6 年多之前 回复
dongle19863
dongle19863 这似乎确实是与网络相关的问题,而不是您的代码有问题。对等方重置连接可能是由于没有人在该端口上侦听或服务由于某种原因未应答您的呼叫而导致的。你检查了吗?
6 年多之前 回复

1个回答



我原本以为 fmt.Fprintf </ code>可能正在更改请求数据,但此示例似乎可以正常运行。</ p>

但是,我仍然 建议使用较低级别的 Write / Read </ code>(而不是 fmt.Fprintf / ioutil.ReadAll </ code>):</ p>

  req:=  [] byte {0x01,0x03,0x00,0x01,0x00,0x01,0xd5,0xca} 

n,err:= conn.Write(req)

if err!= nil {
fmt.Println(“ 写入错误:“,err)
返回
}

fmt.Printf(”为请求写入%d个字节:%#v“,n,req)

rsp:= make([] byte,64 )

n,err = conn.Read(rsp)

fmt.Printf(“响应中收到%d个字节:%#v”,n,rsp [:n])

if err!= nil {
fmt.Println(“读取错误:”,错误)
}
</ code> </ pre>
</ div>

展开原文

原文

Originally I thought that fmt.Fprintf may be changing the request data on the way out, but this example seems to work OK.

However, I would still recommend using the lower-level Write/Read instead of fmt.Fprintf/ioutil.ReadAll:

req := []byte { 0x01, 0x03, 0x00, 0x01, 0x00, 0x01, 0xd5, 0xca }

n, err := conn.Write(req)

if err != nil {
    fmt.Println("write error:", err)
    return
}

fmt.Printf("wrote %d bytes for request: %#v", n, req)

rsp := make([]byte, 64)

n, err = conn.Read(rsp)

fmt.Printf("received %d bytes in response: %#v", n, rsp[:n])

if err != nil {
    fmt.Println("read error:", err)
}

douyongdao4046
douyongdao4046 我重新编写了代码以使用con.Write。 我遇到的主要问题是我的请求数据包格式错误。 我已经使用工作版本更新了帖子中的代码。
6 年多之前 回复
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