listener.js

const nrf = require('nrf');                                                                             
                                                                                                        
const SPI_DEV = '/dev/spidev0.0';                                                                       
const CE_PIN = 25;                                                                                      
const IRQ_PIN = 24;                                                                                     
                                                                                                        
const CHANNEL = 0x4c;                                                                                   
const DATA_RATE = '250kbps';                                                                            
const CRC_BYTES = 1;                                                                                    
const TX_POWER = 'PA_MAX';                                                                              
                                                                                                        
const P0_ADDR = 0xe7e7e7e7e7;                                                                           
                                                                                                        
const radio = nrf.connect(SPI_DEV, CE_PIN, IRQ_PIN);                                                    
                                                                                                        
const opts = {                                                                                          
  autoAck: true                                                                                         
};                                                                                                      
                                                                                                        
radio                                                                                                   
  .channel(CHANNEL)                                                                                     
  .dataRate(DATA_RATE)                                                                                  
  .crcBytes(CRC_BYTES)                                                                                  
  .transmitPower(TX_POWER)                                                                              
  .autoRetransmit({count: 15, delay: 4000});                                                            
                                                                                                        
radio.printDetails(() => {                                                                              
  radio.begin(() => {                                                                                   
    console.log('Listening...');                                                                        
    const rx = radio.openPipe('rx', P0_ADDR, opts);                                                     
    rx.on('data', function(d) {                                                                         
      const val = d.toString('utf-8');                                                                  
      console.log(`Received: ${val}`);                                                                  
    });                                                                                                 
  });                                                                                                   
});