RFM95 with arduino uno Transmitter and receiver

Before starting to  test communicate with Rfm95 with Arduino uno download radio head library

radio head library for arduino uno with rfm
https://drive.google.com/open?id=1iBQWCOm13X3bdDKEcy0czGebPDz_PqQ-

RFM95 with arduino uno connections:

ARDUINO UNO	RFM 95
Gnd	Gnd
3.3v	3.3v
D5	reset
D2	DIO 0
D3	DIO1
D13(SCK)	SCK
D12(MISO)	MISO
D11(MOSI)	MOSI
D10(SS)	NSS

NOTE:

LEVEL SHIFTER FOR BETTER OUTPUT




sender side code:

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

RH_RF95 rf95;

int led = 9;

void setup()
{
  pinMode(led, OUTPUT);   
  Serial.begin(9600);
  while (!Serial) ; // Wait for serial port to be available
  if (!rf95.init())
    Serial.println("init failed");

}

void loop()
{
  if (rf95.available())
  {
    // Should be a message for us now 
    uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
    uint8_t len = sizeof(buf);
    if (rf95.recv(buf, &len))
    {
      digitalWrite(led, HIGH);
     // RH_RF95::printBuffer("request: ", buf, len);
      Serial.print("got request: ");
      Serial.println((char*)buf);
   
//      Serial.print("RSSI: ");
//      Serial.println(rf95.lastRssi(), DEC);
   
   
      /***************************************/
      // Send a reply
      /***************************************/
    char data[32]="";
   int availableBytes = Serial.available();
   for(int i=0; i<availableBytes; i++)
    {   
        data[i]=Serial.read();
    }
      rf95.send(data, sizeof(data));
      rf95.waitPacketSent();
      Serial.println("Sent::");
      Serial.print(data);
       digitalWrite(led, LOW);
     
    }
    else
    {
      Serial.println("recv failed");
    }
  }
  delay(100);
}


receiver side code:

// rf95_client.pde

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

int led = 9;

RH_RF95 rf95;


void setup()
{
  pinMode(led, OUTPUT); 

  Serial.begin(9600);
  while (!Serial) ; // Wait for serial port to be available
  if (!rf95.init())
    Serial.println("init failed");
}

void loop()
{
  rfm95_uart();

}

void rfm95_uart()
{
  Serial.println("Sending to rf95_server::");


  char data[32]="";
   int availableBytes = Serial.available();
   for(int i=0; i<availableBytes; i++)
    {   
        data[i]=Serial.read();
    }
      rf95.send(data, sizeof(data));
      rf95.waitPacketSent();
      Serial.println("Sent::");
      Serial.print(data);
       digitalWrite(led, LOW);

  uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
  uint8_t len = sizeof(buf);


  if (rf95.waitAvailableTimeout(3000))
  {
    // Should be a reply message for us now 
    if (rf95.recv(buf, &len))
   {
      Serial.print("got reply: ");
      Serial.println((char*)buf);
//      Serial.print("RSSI: ");
//      Serial.println(rf95.lastRssi(), DEC); 
    }

    else
    {
      Serial.println("recv failed");
    }
  }

  else
  {
    Serial.println("No reply, is rf95_server running?");
  }
  delay(400);


  }
out put:

after some modification::
send code:
#include <SPI.h>
#include <RH_RF95.h>

RH_RF95 rf95;

int led = 9;

void setup()
{
  pinMode(led, OUTPUT);   
  Serial.begin(9600);
  while (!Serial) ; // Wait for serial port to be available
  if (!rf95.init())
    Serial.println("init failed");
}

void loop()
{
  if (rf95.available())
  {
    // Should be a message for us now 
    uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
    uint8_t len = sizeof(buf);
    if (rf95.recv(buf, &len))
    {
      digitalWrite(led, HIGH);
     // RH_RF95::printBuffer("request: ", buf, len);
      Serial.print("got request: ");
      Serial.println((char*)buf);
      /***************************************/
      // Send a reply
      /***************************************/
    char data[32]="";
   int availableBytes = Serial.available();
   for(int i=0; i<availableBytes; i++)
    {   
        data[i]=Serial.read();
    }
      rf95.send(data, sizeof(data));
      rf95.waitPacketSent();
      Serial.println("Sent::");
      Serial.print(data);
       digitalWrite(led, LOW);
    }
    else
    {
      Serial.println("recv failed");
    }
  }
  delay(100);

}

Receiver code:
// rf95_client.pde

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

int led = 9;

RH_RF95 rf95;


void setup()
{
  pinMode(led, OUTPUT); 

  Serial.begin(9600);
  while (!Serial) ; // Wait for serial port to be available
  if (!rf95.init())
    Serial.println("init failed");
}

void loop()
{
  rfm95_uart();

}

void rfm95_uart()
{
  //Serial.println("Sending to rf95_server::");
  char data[32]="";
   int availableBytes = Serial.available();
   for(int i=0; i<availableBytes; i++)
    {   
        data[i]=Serial.read();
    }
      rf95.send(data, sizeof(data));
      rf95.waitPacketSent();
      Serial.println("Sent::");
      Serial.print(data);
       digitalWrite(led, LOW);

  uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
  uint8_t len = sizeof(buf);
  if (rf95.waitAvailableTimeout(3000))
  {
    if (rf95.recv(buf, &len))
   {
      Serial.print("got reply: ");
      Serial.println((char*)buf);
    }

    else
    {
      Serial.println("recv failed");
    }
  }
  else
  {
    Serial.println("No reply, is rf95_server running?");
  }
  delay(400);
  }