串口数据太多，谁有Arduino修改串口缓冲区大小 和串口监视器显示不完的解决办法？

[fengyupaoyao]

环境： arduino + NBIOT BC260  , 用arduinoIDE开发 

  StringBuilder<512> strBuilder;
  strBuilder.append("AT+QMTCONN=0,");
  strBuilder.append(clientId);
  strBuilder.append(",");
  strBuilder.append(username);
  strBuilder.append(",");
  strBuilder.append(passwd);
  String t_str = strBuilder.toString();
    Serial.println(t_str);
    delay(1000);
    Serial.println(t_str.substring(0,128));
    delay(100);
    Serial.println(t_str.substring(0,90));
    delay(100);
  bool isOK = isConnectNBIOT(t_str, "OK");
  bool isMqttOk = isConnectNBIOT("AT+QMTCONN=0," + String(clientId), "+QMTCONN: 0,0,0");
}
//带返回真假的AT命令调用函数，如：    connectNBIOT("AT+QMTCONN", "+QMTCONN: 0,0,0");
bool isConnectNBIOT(String cmd, char *res) {
  while (1) {
    cmd.trim();  // 去除 cmd 字符串中的空格
    if (cmd.length() <= 0) return;
    Serial.println(SERIAL_OUT_MAX_LEN);
    int length = cmd.length();
    for (int i = 0; i < length; i += SERIAL_OUT_MAX_LEN) {
      if (i + SERIAL_OUT_MAX_LEN < length) {
        Serial.print(cmd.substring(i, i + SERIAL_OUT_MAX_LEN));
      } else {
        Serial.println(cmd.substring(i));
      }
    }
    String response = "";
    while (Serial.available()) {
      //Serial.println("进入while (Serial.available() > 0) 循环");
      response += (char)Serial.read();
    }
    if (response.indexOf(res) != -1) {
      //Serial.println("MQTT Connected successfully!");
      return true;
    } else {
      Serial.print(cmd);
      Serial.println(" Return ERROR! isConnectNBIOT()");
    }
    delay(1000);
  }
  return false;
}

一、我尝试修改Arduino串口缓冲区大小
好不容易在C:\Users\HuaWei\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\cores\arduino找到HardwareSerial.cpp和HardwareSerial.h,  我用的硬串口。打开HardwareSerial.h在开头修改如下代码，有反应但没效果。说明HardwareSerial.h,这个文件是对的，但没效果。

#define SERIAL_RX_BUFFER_SIZE  192  // 接收缓冲区
#define SERIAL_TX_BUFFER_SIZE  192  // 发送缓冲区

//#if !defined(SERIAL_TX_BUFFER_SIZE)
//#if ((RAMEND - RAMSTART) < 1023)
//#define SERIAL_TX_BUFFER_SIZE 64
//#else
//#define SERIAL_TX_BUFFER_SIZE 128
//#endif
//#endif
//#if !defined(SERIAL_RX_BUFFER_SIZE)
//#if ((RAMEND - RAMSTART) < 1023)
//#define SERIAL_RX_BUFFER_SIZE 64
//#else
//#define SERIAL_RX_BUFFER_SIZE 128
//#endif
//#endif

怎么解决，谁有好的办法？

[fengyupaoyao]

我要调用AT命令，命令不长不行