problema al borrar SMS entrantes en SIM800L

hola,estoy tratando de usar el SIM800L en un proyecto, puedo recibir y responder los SMS con el
siguente codigo usando la libreria de Adafruit

#include "Adafruit_FONA.h"
#define FONA_RX 11
#define FONA_TX 12
#define FONA_RST 9

// this is a large buffer for replies
char replybuffer[255];

#include <SoftwareSerial.h>
SoftwareSerial fonaSS = SoftwareSerial(FONA_TX, FONA_RX);
SoftwareSerial *fonaSerial = &fonaSS;

Adafruit_FONA fona = Adafruit_FONA(FONA_RST);

uint8_t readline(char *buff, uint8_t maxbuff, uint16_t timeout = 0);

void setup() {
  while (!Serial);

  Serial.begin(115200);
  Serial.println(F("FONA SMS caller ID test"));
  Serial.println(F("Initializing....(May take 3 seconds)"));

  // make it slow so its easy to read!
  fonaSerial->begin(4800);
  if (! fona.begin(*fonaSerial)) {
    Serial.println(F("Couldn't find FONA"));
    while(1);
  }
  Serial.println(F("FONA is OK"));
}

  
char fonaInBuffer[64];          //for notifications from the FONA

void loop() {
  
  char* bufPtr = fonaInBuffer;    //handy buffer pointer
  
  if (fona.available())      //any data available from the FONA?
  {
    int slot = 0;            //this will be the slot number of the SMS
    int charCount = 0;
    //Read the notification into fonaInBuffer
    do  {
      *bufPtr = fona.read();
      Serial.write(*bufPtr);
      delay(1);
    } while ((*bufPtr++ != '\n') && (fona.available()) && (++charCount < (sizeof(fonaInBuffer)-1)));
    
    //Add a terminal NULL to the notification string
    *bufPtr = 0;
    
    //Scan the notification string for an SMS received notification.
    //  If it's an SMS message, we'll get the slot number in 'slot'
    if (1 == sscanf(fonaInBuffer, "+CMTI: \"SM\",%d", &slot)) {
      Serial.print("slot: "); Serial.println(slot);
      
      char callerIDbuffer[32];  //we'll store the SMS sender number in here
      // Retrieve SMS sender address/phone number.
      if (! fona.getSMSSender(slot, callerIDbuffer, 31)) {
        Serial.println("Didn't find SMS message in slot!");
      }
      Serial.print(F("FROM: ")); Serial.println(callerIDbuffer);
      char replybuffer[255];
      uint16_t smslen;
        if (! fona.readSMS(slot, replybuffer, 250, &smslen)) { // pass in buffer and max len!
          Serial.println("Failed!");
        }
        Serial.print(" ("); Serial.print(smslen); Serial.println(F(") bytes *****"));
        Serial.println(replybuffer);
        Serial.println(F("*****"));
      //Send back an automatic response
      Serial.println("Respondiendo");
      if (!fona.sendSMS(callerIDbuffer, "Me llego tu mensaje!")) {
        Serial.println(F("Failed"));
      } else {
        Serial.println(F("Sent!"));
      }

    }
  }
}

pero necesito borrar los mensajes SMS para asi prevenir que la SIM se llene e impida recibir SMS
escribi el siguiente codigo segun el ejemplo de la libreria pero no funciona

#include "Adafruit_FONA.h"
#define FONA_RX 11
#define FONA_TX 12
#define FONA_RST 9

// this is a large buffer for replies
char replybuffer[255];

#include <SoftwareSerial.h>
SoftwareSerial fonaSS = SoftwareSerial(FONA_TX, FONA_RX);
SoftwareSerial *fonaSerial = &fonaSS;

Adafruit_FONA fona = Adafruit_FONA(FONA_RST);

uint8_t readline(char *buff, uint8_t maxbuff, uint16_t timeout = 0);

void setup() {
  while (!Serial);

  Serial.begin(115200);
  Serial.println(F("FONA SMS caller ID test"));
  Serial.println(F("Initializing....(May take 3 seconds)"));

  // make it slow so its easy to read!
  fonaSerial->begin(4800);
  if (! fona.begin(*fonaSerial)) {
    Serial.println(F("Couldn't find FONA"));
    while(1);
  }
  Serial.println(F("FONA is OK"));
}

  
char fonaInBuffer[64];          //for notifications from the FONA

void loop() {
  
  char* bufPtr = fonaInBuffer;    //handy buffer pointer
  
  if (fona.available())      //any data available from the FONA?
  {
    int slot = 0;            //this will be the slot number of the SMS
    int charCount = 0;
    //Read the notification into fonaInBuffer
    do  {
      *bufPtr = fona.read();
      Serial.write(*bufPtr);
      delay(1);
    } while ((*bufPtr++ != '\n') && (fona.available()) && (++charCount < (sizeof(fonaInBuffer)-1)));
    
    //Add a terminal NULL to the notification string
    *bufPtr = 0;
    
    //Scan the notification string for an SMS received notification.
    //  If it's an SMS message, we'll get the slot number in 'slot'
    if (1 == sscanf(fonaInBuffer, "+CMTI: \"SM\",%d", &slot)) {
      Serial.print("slot: "); Serial.println(slot);
      
      char callerIDbuffer[32];  //we'll store the SMS sender number in here
      // Retrieve SMS sender address/phone number.
      if (! fona.getSMSSender(slot, callerIDbuffer, 31)) {
        Serial.println("Didn't find SMS message in slot!");
      }
      Serial.print(F("FROM: ")); Serial.println(callerIDbuffer);
      char replybuffer[255];
      uint16_t smslen;
        if (! fona.readSMS(slot, replybuffer, 250, &smslen)) { // pass in buffer and max len!
          Serial.println("Failed!");
        }
        Serial.print(" ("); Serial.print(smslen); Serial.println(F(") bytes *****"));
        Serial.println(replybuffer);
        Serial.println(F("*****"));
      //Send back an automatic response
      Serial.println("Respondiendo");
      if (!fona.sendSMS(callerIDbuffer, "Me llego tu mensaje!")) {
        Serial.println(F("Failed"));
      } else {
        Serial.println(F("Sent!"));
      }
      // flushSerial();
      Serial.print(F("Delete #"));
        uint8_t smsn = readnumber();
        Serial.print(F("\n\rDeleting SMS #")); Serial.println(smsn);
        if (fona.deleteSMS(smsn)) {
          Serial.println(F("OK!"));
        } else {
          Serial.println(F("Couldn't delete"));
        }
    }
  }
}
char readBlocking() {
  while (!Serial.available());
  return Serial.read();
}
uint16_t readnumber() {
  uint16_t x = 0;
  char c;
  while (! isdigit(c = readBlocking())) {
    //Serial.print(c);
  }
  Serial.print(c);
  x = c - '0';
  while (isdigit(c = readBlocking())) {
    Serial.print(c);
    x *= 10;
    x += c - '0';
  }
  return x;
}

¿ alguien sabe como podria borrar los sms una vez llegados, leidos y respondidos ?, por anticipado…gracias

Si usas la librería SIM900 todo eso esta fácilmente resuelto.

Descárgala, mira el ejemplo SMS y ya verás.

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