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[求助] SIM7000 NB-IoT LTE GPRS 串口无法输入AT指令

运行程序后，串口接受信息但无法发送AT指令。是操作有问题吗
#include <DFRobot_SIM7000.h>

#define PIN_TX    7
#define PIN_RX    8
SoftwareSerial    mySerial(PIN_RX,PIN_TX);
DFRobot_SIM7000 sim7000(&mySerial);

void setup() {
Serial.begin(115200);
mySerial.begin(19200);

Serial.println("Turn ON SIM7000......");
if(sim7000.turnON()){                            //Turn ON SIM7000
      Serial.println("Turn ON !");
}

Serial.println("Set baud rate......");
if(sim7000.setBaudRate(19200)){                //Set baud rate from 115200 to 19200
      Serial.println("Set baud rate:19200");
}else{
      Serial.println("Faile to set baud rate");
      while(1);
}

mySerial.begin(19200);
Serial.println("For example, if you type AT\\r\\n, OK\\r\\n will be responsed!");
Serial.println("Enter your AT command :");
}

void loop() {
mySerial.listen();
while(mySerial.available()){
      Serial.write(mySerial.read());
}

mySerial.flush();
while(Serial.available()){
      mySerial.write(Serial.read());
}

delay(20);
}