framework-arduinoteensy-cxx20/libraries/RadioHead/examples/cc110/cc110_server/cc110_server.pde

// cc110_server.pde
// -*- mode: C++ -*-
// Example sketch showing how to create a simple messageing server
// with the RH_CC110 class. RH_CC110 class does not provide for addressing or
// reliability, so you should only use RH_CC110  if you do not need the higher
// level messaging abilities.
// It is designed to work with the other example cc110_client
// Tested with Teensy 3.1 and Anaren 430BOOST-CC110L


#include <SPI.h>
#include <RH_CC110.h>

// Singleton instance of the radio driver
RH_CC110 cc110;

void setup() 
{
  Serial.begin(9600);
  while (!Serial)
    ; // wait for serial port to connect. Needed for native USB

  // CC110L may be equipped with either 26 or 27MHz crystals. You MUST
  // tell the driver if a 27MHz crystal is installed for the correct configuration to
  // occur. Failure to correctly set this flag will cause incorrect frequency and modulation
  // characteristics to be used. You can call this function, or pass it to the constructor
  cc110.setIs27MHz(true); // Anaren 430BOOST-CC110L Air BoosterPack test boards have 27MHz
  if (!cc110.init())
    Serial.println("init failed");
  // After init(), the following default values apply:
  // TxPower: TransmitPower5dBm
  // Frequency: 915.0
  // Modulation: GFSK_Rb1_2Fd5_2 (GFSK, Data Rate: 1.2kBaud, Dev: 5.2kHz, RX BW 58kHz, optimised for sensitivity)
  // Sync Words: 0xd3, 0x91
  // But you can change them:
//  cc110.setTxPower(RH_CC110::TransmitPowerM30dBm);
//  cc110.setModemConfig(RH_CC110::GFSK_Rb250Fd127);
//cc110.setFrequency(928.0);
}

void loop()
{
  if (cc110.available())
  {
    // Should be a message for us now   
    uint8_t buf[RH_CC110_MAX_MESSAGE_LEN];
    uint8_t len = sizeof(buf);
    if (cc110.recv(buf, &len))
    {
//      RH_CC110::printBuffer("request: ", buf, len);
      Serial.print("got request: ");
      Serial.println((char*)buf);
//      Serial.print("RSSI: ");
//      Serial.println(cc110.lastRssi(), DEC);
      
      // Send a reply
      uint8_t data[] = "And hello back to you";
      cc110.send(data, sizeof(data));
      cc110.waitPacketSent();
      Serial.println("Sent a reply");
    }
    else
    {
      Serial.println("recv failed");
    }
  }
}