【得捷电子Follow me第4期】基础任务二：主控板建立TCPIP或UDP服务器

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【得捷电子Follow me第4期】基础任务二：主控板建立TCPIP或UDP服务器 [复制链接]

 

测试UDP通信测试，编译环境Arduino IDE。

 

一、基础任务二内容

 

基础任务二：主控板建立TCPIP或UDP服务器，局域网PC使用TCPIP或UDP客户端进行连接并发送数据，主控板接收到数据后，送液晶屏显示(没有则通过串口打印显示)；通过抓包软件抓取交互报文，展示并分析。(TCP和UDP二选一，或者全都操作)。

 

二、代码

 

测试代码

#include <SPI.h>
#include <Ethernet.h>
#include <Dns.h>
#include <EthernetUdp.h>

// 网卡mac地址
byte mac[] = { 0x00, 0x01, 0x00, 0x00, 0x00, 0xFF };

DNSClient dnClient;
EthernetUDP Udp;

IPAddress dstip;
//SOCKET pingSocket = 0;
//char buffer[256];
char packetBuffer[UDP_TX_PACKET_MAX_SIZE];  // buffer to hold incoming packet,
char ReplyBuffer[] = "acknowledged";        // a string to send back


// 静态ip地址、DNS服务、网关、子网掩码
IPAddress ip(192, 168, 1, 205);
IPAddress myDns(192, 168, 1, 1);
IPAddress gateway(192, 168, 1, 1);
IPAddress subnet(255, 255, 255, 0);

unsigned int localPort = 5000;      // local port to listen on

void setup() {
  // 配置LED
  pinMode(LED_BUILTIN, OUTPUT);
  // 配置串口
  Serial.begin(115200);
  while (!Serial) {
    ;  // 等待串口连接
  }

  // 静态IP设置
  Serial.println("Ethernet Begin");
  Ethernet.init(17);
  Ethernet.begin(mac, ip, myDns, gateway, subnet);

  // 输出网卡mac地址、IP地址、子网掩码、DNS、网关
  Serial.print("My Mac address: ");
  byte macBuffer[6];               // 设置mac地址存储buff
  Ethernet.MACAddress(macBuffer);  // 读取mac地址
  for (byte octet = 0; octet < 6; octet++) {
    Serial.print(macBuffer[octet], HEX);
    if (octet < 5) {
      Serial.print('-');
    }
  }
  Serial.println("");

  Serial.print("My IP address: ");
  Serial.println(Ethernet.localIP());

  Serial.print("My subnet: ");
  Serial.println(Ethernet.subnetMask());

  Serial.print("My DNS address: ");
  Serial.println(Ethernet.dnsServerIP());

  Serial.print("My GateWay address: ");
  Serial.println(Ethernet.gatewayIP());

  dnClient.begin(Ethernet.dnsServerIP());

if (Ethernet.hardwareStatus() == EthernetNoHardware) {
    Serial.println("Ethernet shield was not found.  Sorry, can't run without hardware. :(");
    while (true) {
      delay(1); // do nothing, no point running without Ethernet hardware
    }
  }
  if (Ethernet.linkStatus() == LinkOFF) {
    Serial.println("Ethernet cable is not connected.");
  }

  Udp.begin(localPort);

}

void loop() {

  int packetSize = Udp.parsePacket();
  if (packetSize) 
  {
    Serial.print("Received packet of size ");
    Serial.println(packetSize);
    Serial.print("From ");
    IPAddress remote = Udp.remoteIP();
    for (int i=0; i < 4; i++) {
      Serial.print(remote[i], DEC);
      if (i < 3) {
        Serial.print(".");
      }
    }
    Serial.print(", port ");
    Serial.println(Udp.remotePort());

    Udp.read(packetBuffer, UDP_TX_PACKET_MAX_SIZE);
    Serial.println("Contents:");
    Serial.println(packetBuffer);

    Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
    Udp.write(ReplyBuffer);
    Udp.endPacket();
  }

  digitalWrite(LED_BUILTIN, HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(10);                      // wait for a second
  digitalWrite(LED_BUILTIN, LOW);   // turn the LED off by making the voltage LOW
  delay(50);                      // wait for a second
}

 

三、测试

 

3.1、创建UDP终端，连接远程主机IP（开发板IP地址）

 

3.2、开发板串口输出

开发板输出接收UDP的数据

 

3.3、抓包软件

抓包接收到的内容