bool initCommunication() {
  WiFi.persistent(false);
  bool ok = WifiEspNowBroadcast.begin("CO-WARN", 3);
  if (!ok) {
    LOG("WifiEspNowBroadcast.begin() failed");
    return false;
  }
  WifiEspNowBroadcast.onReceive(processRx, nullptr);
  LOG("MAC address of this node is %s", WiFi.softAPmacAddress().c_str());
  return true;
}

/*
   process wifi stack Rx interrupt
*/
ICACHE_RAM_ATTR void processRx(const uint8_t mac[6], const uint8_t* buf, size_t count, void* cbarg) {
  //simple frame size check
  if (count != sizeof(receiveBuffer[rxCounter])) {
    return;
  }
  else
  {
    receiveBuffer[rxCounter] = *(rm370*)buf;
    //memcpy(&receiveBuffer[rxCounter].originMAC[0], &mac, sizeof(receiveBuffer[rxCounter].originMAC)); //dont overwrite original package
    //shift ring buffer input pointer
    if (rxCounter + 1 < MAX_PEERS) {
      rxCounter++;
    }
    else {
      rxCounter = 0;
    }
  }
  LOG("[%02d] Message from %02X:%02X:%02X:%02X:%02X:%02X", rxCounter, mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
}

/*

*/
void checkMessage() {
  if (receiveBuffer[rxHandlePointer].PREAMBLE1 == 'R' && receiveBuffer[rxHandlePointer].PREAMBLE2 == 'M') {
    LOG("Origin MAC %02X:%02X:%02X:%02X:%02X:%02X || \tStatus: %c | BatWarn: %c",
        receiveBuffer[rxHandlePointer].originMAC[0],
        receiveBuffer[rxHandlePointer].originMAC[1],
        receiveBuffer[rxHandlePointer].originMAC[2],
        receiveBuffer[rxHandlePointer].originMAC[3],
        receiveBuffer[rxHandlePointer].originMAC[4],
        receiveBuffer[rxHandlePointer].originMAC[5],
        receiveBuffer[rxHandlePointer].code, 
        (receiveBuffer[rxHandlePointer].batteryWarning) ? '!' : '.');
    switch (receiveBuffer[rxHandlePointer].code) {
      case 'r':
        //LOG("\tALARM received");
        break;
      case 'y':
        //LOG("\tWARNING received");
        break;
      case 'g':
        //LOG("\tGREEN received");
        break;
      default:
        break;
    }
    if (receiveBuffer[rxHandlePointer].batteryWarning == true) {
      //LOG("\tBAT Warning received");
    }
    refreshGlobalStatus = true;
  }
  else {
    DEBUGLOG("Payload does not contain known preamble.");
  }
}


void sendMessage() {
}