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我正在尝试通过 sim800 gsm 模块将传感器数据推送到 aws 云数据库。

我可以通过串行监视器手动输入 at 命令来做到这一点，但是当我将 at 命令合并到代码中以自动执行该过程时，我不必手动输入命令，我得到了 cme 错误 3。

请指导如何解决或识别问题。

代码

#include <Arduino.h> //Arduino librabry...optional
#include <SPI.h>//SPI communication library
#define TINY_GSM_MODEM_SIM800
#include <TinyGsmClient.h>//library with GSM commands

HardwareSerial SerialGSM(1);

TinyGsm modemGSM(SerialGSM);

const int BAUD_RATE = 115200;


//Pin definition for RX and TX GPIO2 and GPIO4 are the pins in ESP32 Wroom
const int RX_PIN = 4, TX_PIN = 2;
//const char *APN = "";
//const char *USER = "";
//const char *PASSWORD = "";


//Initialize the gsm
void setupGSM() {
  SerialGSM.begin(BAUD_RATE, SERIAL_8N1, RX_PIN, TX_PIN, false);
  delay(3000);
  Serial.println(modemGSM.getModemInfo());
delay(1000);
}


String sendAT(String command)
{
  String response = "";
  SerialGSM.println(command);
  // aguardamos até que haja resposta do SIM800L
  while(!SerialGSM.available());

  response = SerialGSM.readString();
  Serial.println(response);
  return response;  
}



void setup() {
  Serial.begin(BAUD_RATE);
  Serial.println("Starting the device");
  Serial.println("Initializing GSM device");
  setupGSM();
delay(5000);
SerialGSM.println("AT+CMEE=1");


}
unsigned long start;
void loop() {

//SerialGSM.println("AT+CMEE?");
sendAT("AT+CMEE?");
 // SerialGSM.write("AT+COPS?\r\n");
   delay(100);
    //SerialGSM.println("AT+CSQ");
    sendAT("AT+CSQ");
//     if(SerialGSM.available()){
//       Serial.write(SerialGSM.read());       
//    }
    delay(100);

    // SerialGSM.println("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"");
     sendAT("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"");
    delay(1000);

    
    // SerialGSM.println("AT+SAPBR=3,1,\"APN\",\"www\"");
     sendAT("AT+SAPBR=3,1,\"APN\",\"www\"");
    delay(1000);
    
   //SerialGSM.println("AT+SAPBR=1,1");
   sendAT("AT+SAPBR=1,1");
     delay(2000);
    //SerialGSM.println("AT+HTTPINIT");
    sendAT("AT+HTTPINIT");
  delay(1000);
   //SerialGSM.println("AT+HTTPPARA=\"CID\",1");
   sendAT("AT+HTTPPARA=\"CID\",1");
   delay(1000);

   //SerialGSM.println("AT+HTTPPARA=\"URL\",\"http://ec2-18-217-119-145.us-east-2.compute.amazonaws.com:8000/?light=0&var=1&var2=2&var3=3&var4=4\"");
   sendAT("AT+HTTPPARA=\"URL\",\"http://ec2-18-217-119-145.us-east-2.compute.amazonaws.com:8000/?light=0&var=1&var2=2&var3=3&var4=4\"");
   delay(1000);

   //SerialGSM.println("AT+HTTPACTION=0");
   sendAT("AT+HTTPACTION=0");
   
   delay(2000);  
   //start=millis();
// 
//  while(millis()-start<1000)
//  {
//    if(SerialGSM.available()){
//         Serial.write(SerialGSM.read());
//                             }
//  }    
 }
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