TTGO Semtech SX1276 ESP32 LoRa board using Radio Head RH_RF95. This program is used to test getting the LoRa service to initialize.

ttgo_RH95_init.ino

/* 
   ttgo_RH_RF95_init  This program is used to test getting the LoRa service to initialize on a TTGO ESP32 LoRa board
   ref: https://microcontrollerslab.com/ttgo-lora32-sx1276-oled-board-pinout-getting-started-with-arduino-ide/
*/
#include <SPI.h>
#include <RH_RF95.h>
#include <RHReliableDatagram.h>

// LoRa pins for TTGO Semtech SX1276 
#define LORA_MISO 19
#define LORA_MOSI 27
#define LORA_SCK 5
#define LORA_SS 18 
#define LORA_IRQ 26 
#define LORA_RST 14

#define LORA_BAND 915E6  // LoRa Band 915E6 for North America
#define TxPower 20 // defaults to 17; 20 is highest

#define CLIENT_ADDRESS 1

int counter = 0;
RH_RF95 rf95; 
RHReliableDatagram manager(rf95, CLIENT_ADDRESS);

void startLoRA(){
    pinMode(LORA_RST, OUTPUT);
    delay(10);
    digitalWrite(LORA_RST, LOW);
    delay(10);
    digitalWrite(LORA_RST, HIGH);
    delay(10);   
    SPI.begin(LORA_SCK, LORA_MISO, LORA_MOSI, LORA_SS); //SPI LoRa pins 
    while (!manager.init() && counter < 10) {      
      Serial.print(".");
      counter++;
      delay(500);
  }
  if (counter == 10) {
      Serial.println("Starting LoRa failed!"); 
  } else {
      pinMode(2, OUTPUT);   //turn on the onboard LED
      digitalWrite(2, HIGH);
      Serial.println("LoRa Initialization OK!"); }
  delay(2000);  
}
void setup(){
  Serial.begin(115200);  
  Serial.print("In Setup");
  startLoRA();    
}
void loop(){
}