Help Adafruit LoRa RFM9X

Projects Programming
5

I currently have a mkr that is transmitting gps data and it works with this code:

/* SCRIPT PER VERIFICARE SE IL GPS È SBLOCCATO*/

#include <Arduino_MKRGPS.h>
#include <SPI.h>
#include <SD.h>
#include <Wire.h>
#include <LoRa.h>

float lat_previous  = 0;
float long_previous = 0;
float alt_previous  = 0;

byte destination = 0x3D;

void setup() {
  Serial.begin(9600);
  Wire.begin();

  if (!GPS.begin(GPS_MODE_SHIELD)) {
    Serial.println("Failed to initialize GPS!");
    while (1);
  }

  if (!SD.begin(4)) {
    Serial.println("Card failed, or not present");
    while (1);
  }

  if (!LoRa.begin(868E6)) {
   Serial.println("Starting LoRa failed!");
    while (1);
  }
  LoRa.setTxPower(17);   //17 dB (defoult)(max power)
  
  LoRa.setSpreadingFactor(10);  //7 defoult (can be set from 6 to 12)
  LoRa.setSignalBandwidth(62.5E3); //125E3 defoult (7.8 10.4 15.6 20.8 31.25 41.7 62.5 125 250 500) 
  LoRa.setCodingRate4(8); //5 defoult (can be from 5 to 8 that correspond to 4/5 and 4/8)

}

void loop() {

  if (GPS.available()) {
    // read GPS values
    unsigned long time = GPS.getTime();
    float latitude   = GPS.latitude();
    float longitude  = GPS.longitude();
    float altitude   = GPS.altitude();
    float speed      = GPS.speed();
    int   satellites = GPS.satellites();

    // store GPS value in case GPS signal is lost
    lat_previous  = latitude;
    long_previous = longitude;
    alt_previous  = altitude;

    // print GPS values, IN ORDER AS ABOVE
    Serial.print("£ , ");
    Serial.print(time);
    Serial.print(" , ");
    Serial.print(latitude, 7);
    Serial.print(" , ");
    Serial.print(longitude, 7);
    Serial.print(" , ");
    Serial.print(altitude);
    Serial.print(" , ");
    Serial.print(speed);
    Serial.print(" , ");
    Serial.print(satellites);
    Serial.println(" , $");


    // store in the SD card
    File log = SD.open("datalog.txt", FILE_WRITE);

    log.print("£ , ");
    log.print(time);
    log.print(" , ");
    log.print(latitude, 7);
    log.print(" , ");
    log.print(longitude, 7);
    log.print(" , ");
    log.print(altitude);
    log.print(" , ");
    log.print(speed);
    log.print(" , ");
    log.print(satellites);
    log.println(" , $");

    log.close();

    // transmission of data with LORA
    LoRa.beginPacket();

    LoRa.write(destination);
    LoRa.print("£ , ");  
    LoRa.print(latitude, 7);
    LoRa.print(" , ");
    LoRa.print(longitude, 7);
    LoRa.print(" , ");
    LoRa.print(altitude);
    LoRa.print(" , ");
    LoRa.print(speed);
    LoRa.print(" , $");

    LoRa.endPacket();
  }

  //if GPS is lost, the last known position is sent
  // if(!GPS.available()){
  //   LoRa.beginPacket();

  //   LoRa.write(destination);
  //   LoRa.print(" £ , ");  
  //   LoRa.print(lat_previous, 7);
  //   LoRa.print(" , ");
  //   LoRa.print(long_previous, 7);
  //   LoRa.print(" , ");
  //   LoRa.print(alt_previous);
  //   LoRa.print(" , $");

  //   LoRa.endPacket();

  //   Serial.println("Sent");
  // }
}

while as a receiver I have an esp32 connected with an adafruit rfm9x Lora, which seems to work but does not receive anything, the code on the receiver is :

#include <SPI.h>
#include <RH_RF95.h>

#define RFM95_CS 4
#define RFM95_RST 15
#define RFM95_INT 5

#define RF95_FREQ 868.0 // Frequenza di operazione corrispondente al transmitter

RH_RF95 rf95(RFM95_CS, RFM95_INT);

#define LED 13

void setup() {
  pinMode(LED, OUTPUT);
  pinMode(RFM95_RST, OUTPUT);
  digitalWrite(RFM95_RST, HIGH);

  Serial.begin(9600);
  while (!Serial) {
    ; // attendi che la porta seriale si connetta. Necessario solo per le schede con USB nativo
  }
  delay(1000); // aspetta un po' per l'inizializzazione del seriale

  Serial.println("Arduino LoRa RX Test!");

  digitalWrite(RFM95_RST, LOW);
  delay(10);
  digitalWrite(RFM95_RST, HIGH);
  delay(10);

  while (!rf95.init()) {
    Serial.println("LoRa radio init failed");
    while (1);
  }

  if (!rf95.setFrequency(RF95_FREQ)) {
    Serial.println("setFrequency failed");
    while (1);
  }

  // Configura le impostazioni LoRa per corrispondere al transmitter
  rf95.setTxPower(17, false); // 17 dBm
  rf95.setSpreadingFactor(10); // SF10
  rf95.setSignalBandwidth(62500); // 62.5 kHz
  rf95.setCodingRate4(8); // 4/8

  Serial.println("LoRa radio init OK!");
}

void loop() {
  if (rf95.available()) {
    // Dovrebbe esserci un messaggio per noi ora
    uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
    uint8_t len = sizeof(buf);
    
    if (rf95.recv(buf, &len)) {
      digitalWrite(LED, HIGH);
      Serial.print("Ricevuto: ");
      for (int i = 0; i < len; i++) { // Stampare tutto il messaggio
          Serial.print((char)buf[i]);
      }
      Serial.println();
      digitalWrite(LED, LOW);
    } else {
      Serial.println("Ricezione fallita");
    }
  }
}

I only receive this on the serial line:

01:25:03.397 -> Arduino LoRa RX Test!
01:25:03.475 -> LoRa radio init OK!

what am I doing wrong ? can you give me a hand please? I'm not good at these modules...