"requestPermissions": [
      {
        "name": "ohos.permission.INTERNET",
        "usedScene": {
          "abilities": [
            "ohos.samples.socket.EntryAbility"
          ],
          "when": "always"
        }
      },
      {
        "name": "ohos.permission.GET_WIFI_INFO",
        "usedScene": {
          "abilities": [
            "ohos.samples.socket.EntryAbility"
          ],
          "when": "always"
        }
      }
    ]

//為了獲取本地IP地址，需要導入@ohos.wifiManager
import wifiManager from '@ohos.wifiManager';

// 解析標準系統開發板(3568)端本地IP地址
export function resolveIP(ip: number): string {
  if (ip < 0 || ip > 0xFFFFFFFF) {
    throw ('The number is not normal!');
  }
  return (ip >>> 24) + '.' + (ip >> 16 & 0xFF) + '.' + (ip >> 8 & 0xFF) + '.' + (ip & 0xFF);
}

// 獲取標準系統開發板(3568)端本地IP地址
let localAddress = resolveIP(wifiManager.getIpInfo().ipAddress);

// 標準系統開發板(3568)本地ip地址和端口
let bindAddress = {
  address: localAddress,
  port: 5678, // 綁定端口，如1234
  family: 1
};

...
...

        //用一個test組件顯示本地IP地址
        Text(this.message0)
          .fontSize(25)
          .margin({top:0})
          .fontWeight(FontWeight.Normal)
          .backgroundColor(Color.White)

        //用一個test組件顯示本地socket端口號
        Text(this.message1)
          .fontSize(25)
          .margin({top:0})
          .fontWeight(FontWeight.Normal)
          .backgroundColor(Color.White)

// 訂閱TCPSocket相關的訂閱事件
            tcp.on('message',value => {
              this.message_recv = this.resolveArrayBuffer(value.message)
              console.log(`TCP_data` + this.message_recv);
            });

            tcp.on('connect', () => {
              console.log("on connect")
            });
            tcp.on('close', () => {
              console.log("on close")
            });

            // 綁定本地ip地址和端口
            tcp.bind(bindAddress, err => {
              if (err) {
                promptAction.showToast({
                  message: '[3861_car_control] bind fail',
                  duration: 3000,
                  bottom: 10
                });
                console.log('[3861_car_control] bind fail');
                return;
              }
              promptAction.showToast({
                message: '[3861_car_control] bind success',
                duration: 3000,
                bottom: 10
              });
              console.log('[3861_car_control] bind success');
            });

// 3861 IP地址和端口
            let connectAddress = {
              address: this.car_ipaddress,
              port: num, // 端口號
              family: 1
            };

            //連接到指定的3861IP地址和端口
            tcp.connect({
              address: connectAddress, timeout: 6000
            }, err => {
              if (err) {
                promptAction.showToast({
                  message: '[3861_car_control] connect'+this.car_ipaddress+' fail',
                  duration: 3000,
                  bottom: 10
                });
                console.log('[3861_car_control] connect'+this.car_ipaddress+' fail');
                return;
              }
              promptAction.showToast({
                message: '[3861_car_control] connect'+this.car_ipaddress+' success',
                duration: 3000,
                bottom: 10
              });
              console.log('[3861_car_control] connect'+this.car_ipaddress+' success');
            });

tcp.send({
              data: '0'
            }, err => {
             if (err) {
                console.log('[3861_car_control] send fail');
                return;
              }
              console.log('[3861_car_control] send success');
            })

//解析標準系統開發板(3568)接收到的 輕量系統(3861)發送的數據
  resolveArrayBuffer(message: ArrayBuffer): string {
    if (message instanceof ArrayBuffer) {
      let dataView = new DataView(message)
      console.info(`length ${dataView.byteLength}`)
      let str = ""
      for (let i = 0;i < dataView.byteLength; ++i) {
        let c = String.fromCharCode(dataView.getUint8(i))
        if (c !== "\n") {
          str += c
        }
      }
      console.info(`message aray buffer:${str}`)
      return str;
    }
  }

...
...

            // 訂閱TCPSocket相關的訂閱事件
            tcp.on('message',value => {
              this.message_recv = this.resolveArrayBuffer(value.message)
              console.log(`TCP_data` + this.message_recv);
            });

···
···

        //用一個text顯示標準系統開發板(3568)接收到輕量系統(3861)發出的數據
        Text('接收到的3861發送的數據：' + this.message_recv)
          .fontSize(25)
          .margin({top:0})
          .fontWeight(FontWeight.Normal)
          .backgroundColor(Color.White)

tcp.close((err) => {
              promptAction.showToast({
                message: '[3861_car_control] close socket.',
                duration: 3000,
                bottom: 10
              });
              console.log('[3861_car_control] close socket.')
            });
            tcp.off('message');
            tcp.off('connect');
            tcp.off('close');

//3861發送數據
        retval = send(connfd, request, strlen(request), 0);
        if (retval <= 0) {

           //3568側斷開與3861的tcp連接后進行的處理
           printf("_______________________________________\r\n");
           printf("send response failed, %ld!\r\n", retval);
           printf("do_reconnect...\r\n");
           sleep(DELAY_1S);
           close(connfd);//關閉與客戶端的連接
           sleep(DELAY_1S); // for debug

           break;//跳出while循環
           car_stop();//小車進入停止狀態

        }else{
           printf("The data responsed to the client is %s\r\n", request);
        }

//3861接收數據
       retval = recv(connfd, request, sizeof(request), 0);
       if (retval < 0) {

           //3568側斷開與3861的tcp連接后進行的處理
           printf("_______________________________________\r\n");
           printf("recv request failed, %ld!\r\n", retval);
           printf("do_reconnect...\r\n");
           sleep(DELAY_1S);
           close(connfd);//關閉與客戶端的連接
           sleep(DELAY_1S); // for debug
           
           break;//跳出while循環
           car_stop();//小車進入停止狀態

        }else{
           printf("_______________________________________\r\n");
           printf("The data received from the client is %s \r\n", request);
        }

while (1) {

    connfd = accept(sockfd, (struct sockaddr *)&clientAddr, &clientAddrLen);
    if (connfd < 0) {
        printf("accept failed, %d, %d\r\n", connfd, errno);
        continue;
    }else{
    printf("_______________________________________\r\n");
    printf("accept success, connfd = %d!\r\n", connfd);
    printf("client addr info: host = %s, port = %hu\r\n", inet_ntoa(clientAddr.sin_addr), ntohs(clientAddr.sin_port));
    }

/***********************************socket收、發的部分************************************************/

       // 后續 收、發 都在 表示連接的 socket 上進行；
       while (1) {
       char request[128] = "";
      .................
      .................
/*************************************************************************************************/

    }

    }