将数据从 Arduino 发送到 Node MCU，但未在串行监视器上显示

Question

大家好，我正在将我的数据从 Arduino Mega 发送到 NodeMCU。我想做一个串行通信。我的 Arduino 代码是关于操作多个按钮，而 nodemcu 代码相对简单。 arduino 上的代码运行良好，NodeMCU 上的代码上传没有问题，但在 Node 串行监视器上没有显示任何内容。我在下面附上了我的两个代码，任何人都可以告诉我我需要做什么才能使其正常工作。首先，我的arduino代码：

#include <ezButton.h>
#include <SoftwareSerial.h>


ezButton button1 (22);
ezButton button2 (24);
ezButton button3 (26);
ezButton button4 (28);
ezButton button5 (30);


SoftwareSerial espSerial(18, 19);
String str;
int Myval = 255;
int buttonDown = 0; 

void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
espSerial.begin(9600);
button1.setDebounceTime(50);
button2.setDebounceTime(50);
button3.setDebounceTime(50);
button4.setDebounceTime(50);
button5.setDebounceTime(50);


}

void loop() {
// put your main code here, to run repeatedly:
button1.loop();
button2.loop();
button3.loop();
button4.loop();
button5.loop();


int btn1S = button1.getState();
int btn2S = button2.getState();
int btn3S = button3.getState();
int btn4S = button4.getState();
int btn5S = button5.getState();

Serial.print("button 1 state: ");
Serial.println(btn1S);
Serial.print("button 2 state: ");
Serial.println(btn2S);
Serial.print("button 3 state: ");
Serial.println(btn3S);
Serial.print("button 4 state: ");
Serial.println(btn4S);
Serial.print("button 5 state: ");
Serial.println(btn5S);

if(button1.isPressed()&& buttonDown == 0){
Serial.println("Fucntion for 22 is now on");
buttonDown = 1;
}

if(button1.isReleased()&& buttonDown == 1){
Serial.println("Function for 22 is now off");
buttonDown = 0;
}

if(button2.isPressed()&& buttonDown == 0){
Serial.println("Fucntion for 24 is now on");
buttonDown = 1;
}

if(button2.isReleased()&& buttonDown == 1){
Serial.println("Function for 24 is now off");
buttonDown = 0;
}

if(button3.isPressed()&& buttonDown == 0){
Serial.println("Fucntion for 26 is now on");
buttonDown = 1;
}

if(button3.isReleased()&& buttonDown == 1){
Serial.println("Function for 26 is now off");
buttonDown = 0;
}

if(button4.isPressed()&& buttonDown == 0){
Serial.println("Fucntion for 28 is now on");
buttonDown = 1;
}

if(button4.isReleased()&& buttonDown == 1){
Serial.println("Function for 28 is now off");
buttonDown = 0;
}

if(button5.isPressed()&& buttonDown == 0){
Serial.println("Fucntion for 30 is now on");
buttonDown = 1;
}

if(button5.isReleased()&& buttonDown == 1){
Serial.println("Function for 30 is now off");
buttonDown = 0;
}

str = String("Coming from arduino: ")+String("Button 1 is now: ")+String(btn1S)+String("Button 2 is 
now: ")+String(btn2S)+String("Button 3 is now: ")+String(btn3S)+String("Button 4 is now: 
")+String(btn4S)+String("Button 5 is now: ")+String(btn5S);  
espSerial.println(str);


delay(1000);
}

我的 NodeMCU 代码：

void setup() {
// put your setup code here, to run once:

Serial.begin(9600);
while (!Serial) {
; 
}
}


void loop() {
// put your main code here, to run repeatedly:
if (Serial.available()) {
Serial.write(Serial.read()); 
}

}

请帮忙。我在这里陷入了困境。