/*
  Project: LoRa transmitter
  Project Description:
  This project shows you how to receive data from LoRa and print it serially
 
  Author: STEMVentor Educonsulting
  
  This code is copyrighted. Please do not reuse or share for any purpose other than for learning with subscribed STEMVentor programs.
  This code is for educational purposes only and is not for production use.
*/
 
// LIBRARIES
#include <SPI.h>
#include <LoRa.h>
// PIN DEFINTIONS
 
//No need to physically connect these pins in this use case but need to be defined for the LoRa to transmit
// Comment if not using Arduino Nano
#define nss 10 //LoRa module NSS pin
#define rst 9 //LoRa module RST pin
#define dio0 2 //LoRa module dio0 pin
 
// Uncomment if using ESP32
// #define nss 15 //LoRa module NSS pin
// #define rst 16 //LoRa module RST pin
// #define dio0 4 //LoRa module  DIO0 pin
 
// CONSTANT DEFINITIONS
// GLOBAL VARIABLES
 
// Used for reading a string.
String receivedString;
 
// LOCAL FUNCTIONS
 
//setup function for LoRa
void loraSetup()
{
    Serial.println("Starting LoRa Communication");
    LoRa.setPins(nss, rst, dio0); //These pins need not be connected but have to be defined
 
    if (!LoRa.begin(433E6)) { //starts LoRa at 433MHz frequency
      Serial.println("Starting LoRa failed!");
      while (1); // runs only once
    }
    // LoRa.setSyncWord(0xFF); // isolates network , the receiver also needs to have the same syncword. More different the syncwords  , better the isolation.
}
 
//loop function
void sendMessage(String outgoing) //sends the data as a string over LoRa
{
  Serial.println("Sending packet id " + outgoing.substring(0,1)) ; 
  LoRa.beginPacket();                   // start packet
  LoRa.print(outgoing);                 // add payload
  LoRa.endPacket();                     // finish packet and send it
  Serial.println("Sent packet id " + outgoing.substring(0,1));               
}
 
//Read an entire string and then transmit it via LoRa (this is a blocking function and waits until timeout).
void readString()
{
  Serial.println("Enter a data string to be transmitted via LoRa:");
  while (Serial.available() == 0) {}     //wait for data available
  receivedString = Serial.readString();  //read until timeout
  receivedString.trim();                        // remove any \r \n whitespace at the end of the String
}
 
 
// THE setup FUNCTION RUNS ONCE WHEN YOU PRESS RESET OR POWER THE BOARD.
void setup() 
{
  // Start the serial communication with baud rate suitable for your components.
  Serial.begin(9600);
  loraSetup();
  Serial.println("The board is ready!");
}
 
// THE loop FUNCTION RUNS OVER AND OVER AGAIN FOREVER UNTIL THE BOARD IS POWERED OFF.
void loop() 
{
  readString(); 
  sendMessage(receivedString);
}

  /*
  Project: LoRa receiver 
  Project Description:
  This project shows you how to receive data from LoRa and print it serially
 
  Author: STEMVentor Educonsulting
  
  This code is copyrighted. Please do not reuse or share for any purpose other than for learning with subscribed STEMVentor programs.
  This code is for educational purposes only and is not for production use.
*/
 
// LIBRARIES
#include <SPI.h>
#include <LoRa.h>
// PIN DEFINTIONS
 
//No need to physically connect these pins in this use case but need to be defined for the LoRa to transmit
// Comment if not using Arduino Nano
#define nss 10 //LoRa module NSS pin
#define rst 9 //LoRa module RST pin
#define dio0 2 //LoRa module dio0 pin
 
// Uncomment if using ESP32
// #define nss 15 //LoRa module NSS pin
// #define rst 16 //LoRa module RST pin
// #define dio0 4 //LoRa module  DIO0 pin
 
// CONSTANT DEFINITIONS
// GLOBAL VARIABLES
 
// Used for reading a string.
String receivedString;
 
// LOCAL FUNCTIONS
 
//setup function for LoRa
void loraSetup()
{
    Serial.println("Starting LoRa Communication");
    LoRa.setPins(nss, rst, dio0); //These pins need not be connected but have to be defined
 
    if (!LoRa.begin(433E6)) { //starts LoRa at 433MHz frequency
      Serial.println("Starting LoRa failed!");
      while (1); // runs only once
    }
    // LoRa.setSyncWord(0xFF); // isolates network , the receiver also needs to have the same syncword. More different the syncwords  , better the isolation.
}
 
//loop function
void onReceive(int packetSize) 
{
   
  if (packetSize == 0) return;          // if there's no packet, return
  receivedString = "";
 
  while (LoRa.available()) {
    receivedString += (char)LoRa.read();
  }
  Serial.println(receivedString);
}
 
// THE setup FUNCTION RUNS ONCE WHEN YOU PRESS RESET OR POWER THE BOARD.
void setup() 
{
  // Start the serial communication with baud rate suitable for your components.
  Serial.begin(9600);
  loraSetup();
  Serial.println("The board is ready!");
}
 
// THE loop FUNCTION RUNS OVER AND OVER AGAIN FOREVER UNTIL THE BOARD IS POWERED OFF.
void loop() 
{
  onReceive(LoRa.parsePacket()); //constantly listen for incoming data
}