HarmonyOS PB转ArrayBuffer发送失败

使用原本PB转换后的Uint8Array，取Buffer方式发送，提示：

send fail：{“code”:2301104,“message”:“Connection reset by peer”}

on error, err：{“code”:107}

uint8ArrayToString(fileData : Uint8Array){
  let dataString = "";
  for (let i = 0; i < fileData.length; i++) {
    dataString += String.fromCharCode(fileData[i]);
  }
  return dataString
}

// 然后可以通过下面的函数把string转换为ArrayBuffer
strToArrayBuffer(str: string) {
  let buf = new ArrayBuffer(str.length * 2);
  let bufView = new Uint16Array(buf);
  for (let i = 0, strLen = str.length; i < strLen; i++) {
    bufView[i] = str.charCodeAt(i);
  }
  return bufView;
}

sendData(data:Uint8Array) {
  let socketMessage = SocketMessage.SocketMessage.create({payload:data,payloadType:SocketMessage.PayloadType.CS_ENTER_ROOM,compressionType:SocketMessage.SocketMessage.CompressionType.NONE});
  // let arrayBuffer = SocketMessage.SocketMessage.encode(socketMessage).finish().buffer;
  let uint8Array : Uint8Array = SocketMessage.SocketMessage.encode(socketMessage).finish();
  let str:string = this.uint8ArrayToString(uint8Array);
  let arrayBuffer = this.strToArrayBuffer(str);
  let tcpSendOptions: socket.TCPSendOptions = {
    data: arrayBuffer
  }
  this.tcp.send(tcpSendOptions, (err: BusinessError) => {
    if (err) {
      LiveLogger.i(TAG,'send fail' + JSON.stringify(err));
      return;
    }
    LiveLogger.i(TAG,'send success');
  })
}