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// rf95_server.cpp
// Example program showing how to use RH_RF95 on Raspberry Pi
// Uses the bcm2835 library to access the GPIO pins to drive the RFM95 module
// Requires bcm2835 library to be already installed
// Use the Makefile in this directory:
// cd example/raspi/rf95
// make
// sudo ./rf95_server
// Contributed by Charles-Henri Hallard based on sample RH_NRF24 by Mike Poublon
#include <bcm2835.h>
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <RH_RF69.h>
#include <RH_RF95.h>
// define hardware used change to fit your need
// Uncomment the board you have, if not listed
// uncommment custom board and set wiring tin custom section
// LoRasPi board
// see
// iC880A and LinkLab Lora Gateway Shield (if RF module plugged into)
// see
//#define BOARD_IC880A_PLATE
// Raspberri PI Lora Gateway for multiple modules
// see
// Dragino Raspberry PI hat
// see
// Now we include RasPi_Boards.h so this will expose defined
// constants with CS/IRQ/RESET/on board LED pins definition
#include "../RasPiBoards.h"
// Our RFM95 Configuration
#define RF_FREQUENCY 868.00
#define RF_NODE_ID 1
// Create an instance of a driver
//RH_RF95 rf95(RF_CS_PIN);
//Flag for Ctrl-C
volatile sig_atomic_t force_exit = false;
void sig_handler(int sig)
printf("\n%s Break received, exiting!\n", __BASEFILE__);
//Main Function
int main (int argc, const char* argv[] )
unsigned long led_blink = 0;
signal(SIGINT, sig_handler);
printf( "%s\n", __BASEFILE__);
if (!bcm2835_init()) {
fprintf( stderr, "%s bcm2835_init() Failed\n\n", __BASEFILE__ );
return 1;
printf( "RF95 CS=GPIO%d", RF_CS_PIN);
#ifdef RF_LED_PIN
digitalWrite(RF_LED_PIN, HIGH );
#ifdef RF_IRQ_PIN
printf( ", IRQ=GPIO%d", RF_IRQ_PIN );
// IRQ Pin input/pull down
bcm2835_gpio_set_pud(RF_IRQ_PIN, BCM2835_GPIO_PUD_DOWN);
// Now we can enable Rising edge detection
#ifdef RF_RST_PIN
printf( ", RST=GPIO%d", RF_RST_PIN );
// Pulse a reset on module
digitalWrite(RF_RST_PIN, LOW );
digitalWrite(RF_RST_PIN, HIGH );
#ifdef RF_LED_PIN
printf( ", LED=GPIO%d", RF_LED_PIN );
digitalWrite(RF_LED_PIN, LOW );
if (!rf95.init()) {
fprintf( stderr, "\nRF95 module init failed, Please verify wiring/module\n" );
} else {
// Defaults after init are 434.0MHz, 13dBm, Bw = 125 kHz, Cr = 4/5, Sf = 128chips/symbol, CRC on
// The default transmitter power is 13dBm, using PA_BOOST.
// If you are using RFM95/96/97/98 modules which uses the PA_BOOST transmitter pin, then
// you can set transmitter powers from 5 to 23 dBm:
// driver.setTxPower(23, false);
// If you are using Modtronix inAir4 or inAir9,or any other module which uses the
// transmitter RFO pins and not the PA_BOOST pins
// then you can configure the power transmitter power for -1 to 14 dBm and with useRFO true.
// Failure to do that will result in extremely low transmit powers.
// rf95.setTxPower(14, true);
// RF95 Modules don't have RFO pin connected, so just use PA_BOOST
// check your country max power useable, in EU it's +14dB
rf95.setTxPower(14, false);
// You can optionally require this module to wait until Channel Activity
// Detection shows no activity on the channel before transmitting by setting
// the CAD timeout to non-zero:
// Adjust Frequency
// If we need to send something
// Be sure to grab all node packet
// we're sniffing to display, it's a demo
// We're ready to listen for incoming message
printf( " OK NodeID=%d @ %3.2fMHz\n", RF_NODE_ID, RF_FREQUENCY );
printf( "Listening packet...\n" );
//Begin the main body of code
while (!force_exit) {
#ifdef RF_IRQ_PIN
// We have a IRQ pin ,pool it instead reading
// Modules IRQ registers from SPI in each loop
// Rising edge fired ?
if (bcm2835_gpio_eds(RF_IRQ_PIN)) {
// Now clear the eds flag by setting it to 1
//printf("Packet Received, Rising event detect for pin GPIO%d\n", RF_IRQ_PIN);
if (rf95.available()) {
#ifdef RF_LED_PIN
led_blink = millis();
digitalWrite(RF_LED_PIN, HIGH);
// Should be a message for us now
uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
uint8_t len = sizeof(buf);
uint8_t from = rf95.headerFrom();
uint8_t to = rf95.headerTo();
uint8_t id = rf95.headerId();
uint8_t flags= rf95.headerFlags();;
int8_t rssi = rf95.lastRssi();
if (rf95.recv(buf, &len)) {
printf("Packet[%02d] #%d => #%d %ddB: ", len, from, to, rssi);
printbuffer(buf, len);
} else {
Serial.print("receive failed");
#ifdef RF_IRQ_PIN
#ifdef RF_LED_PIN
// Led blink timer expiration ?
if (led_blink && millis()-led_blink>200) {
led_blink = 0;
digitalWrite(RF_LED_PIN, LOW);
// Let OS doing other tasks
// For timed critical appliation you can reduce or delete
// this delay, but this will charge CPU usage, take care and monitor
#ifdef RF_LED_PIN
digitalWrite(RF_LED_PIN, LOW );
printf( "\n%s Ending\n", __BASEFILE__ );
return 0;