Problem with use of CAD to recieve LoRa messages

[wimvanderneut]

Hello,

I have a question about using CAD mode for the SX1276. I want to use this to drastically reduce energy consumption during "standby" use. What I notice, however, is that this does not work correctly. In most cases the lora module goes to the receive status but receives the subsequent message.
The Arduino I use is the atmega328P and runs on the internal 1mhz clock.

The simple testcode I use is showen below.

Sender:

#include <SPI.h>
#include <LoRa.h>

int counter = 0;

void setup() {
  Serial.begin(9600);
  while (!Serial);

  Serial.println("LoRa Sender");

  if (!LoRa.begin(866E6)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }
}

void loop() {
  Serial.print("Sending packet: ");
  Serial.println(counter);

  // send packet
  LoRa.beginPacket();
  LoRa.print("hello ");
  LoRa.print(counter);
  LoRa.endPacket();

  counter++;

  delay(5000);
}

Reciever:

#include <SPI.h>
#include "LoRa.h"



void setup() {
  Serial.begin(9600);
  LoRa.setPins(10, 9, 2);            //LoRa chip pins
  while (!Serial);

  Serial.println("LoRa Receiver Callback");

  if (!LoRa.begin(866E6)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }

  // register the channel activity dectection callback
  LoRa.onCadDone(onCadDone);
  // register the receive callback
  LoRa.onReceive(onReceive);
  // put the radio into CAD mode
  LoRa.channelActivityDetection();
}

void loop() {
  // do nothing
}

void onCadDone(boolean signalDetected) {
  // detect preamble
  if (signalDetected) {
    Serial.println("Signal detected");
    // put the radio into continuous receive mode
    LoRa.receive();
  } else {
    // try next activity dectection
    LoRa.channelActivityDetection();
  }
}

void onReceive(int packetSize) {
  // received a packet
  Serial.print("Received packet '");

  // read packet
  for (int i = 0; i < packetSize; i++) {
    Serial.print((char)LoRa.read());
  }

  // print RSSI of packet
  Serial.print("' with RSSI ");
  Serial.println(LoRa.packetRssi());

  // put the radio into CAD mode
  LoRa.channelActivityDetection();
}

Is there anyone who can help me with this? Thank you very much in advance!