strstr function for string

Projects Programming
1

I am working on the code below. Requires to compare the incoming message from serial with the expected response. please note that the echo mode is on, so i cannot just compare it directly, i have to somehow check with the string received if there is any expected response present.

int sendCommand(String ATcommand, String expected_response) {

  delay(100);
  String incoming_message;
  int answer = 0;
  String Trimmed_message;
  
  mySerial.println(ATcommand);

  do{
    if (mySerial.available() > 0) {
      incoming_message = mySerial.readString();
      Serial.println(incoming_message); 
    }
    Trimmed_message = strstr(incoming_message, expected_response);
    
    if (Trimmed_message == expected_response) {
      answer = 1;
    }

  }while (answer == 0);

  Serial.println(incoming_message);
  
  return answer;
}
2

There is a difference between String (capital S) and string (lower case s, null terminated character arrays). The str functions don't work on String but on string.

3

Do you have a question? Please post complete code that will compile.

4

This is the code. What i am trying to do here is that i want to take incoming_string and compare it with the expected_response. If any part of the expected_response is present in the incoming_string, it returns TRUE.

#include <SoftwareSerial.h>

#define FONA_PWRKEY 6
#define FONA_RST 7

SoftwareSerial mySerial(10, 11); // RX, TX

void setup() {
  pinMode(FONA_RST , OUTPUT);
  digitalWrite(FONA_RST, HIGH);

  pinMode(FONA_PWRKEY, OUTPUT);
  digitalWrite(FONA_PWRKEY,LOW);
  delay(100);
  digitalWrite(FONA_PWRKEY, HIGH);

  Serial.begin(9600);
  Serial.println(F("FONA basic test"));

  mySerial.begin(115200); // Default SIM7000 shield baud rate

  Serial.println(F("Configuring to 9600 baud"));
  mySerial.println("AT+IPR=9600"); // Set baud rate
  delay(100); // Short pause to let the command run
  mySerial.begin(9600);


  Serial.println(F("FONA is OK"));

  systeminit();

  
}


void loop() { // run over and over

}


int sendCommand(char[500] ATcommand, char[500] expected_response) {

  delay(100);
  String incoming_message;
  int answer = 0;
  String Trimmed_message;
  
  mySerial.println(ATcommand);

  do{
    if (mySerial.available() > 0) {
      incoming_message = mySerial.readString();
      Serial.println(incoming_message); 
    }
    Trimmed_message = strstr(incoming_message, expected_response);
    
    if (Trimmed_message == expected_response) {
      answer = 1;
    }

  }while (answer == 0);

  Serial.println(incoming_message);
  
  return answer;
}


void systeminit() {
  sendCommand("AT+CNMP=38", "OK");

}
5

that's a lot of bytes...

int sendCommand(char[[color=red]500[/color]] ATcommand, char[[color=red]500[/color]] expected_response) {

read Serial Input Basics to see how to handle the Serial buffer