Pass RR in BLE Protocol [Heart Rate] for Arduino - c

Question

code:
#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEServer.h>
#include <BLE2902.h>
byte flags = 0b00011110;
byte bpm;
byte rr;
byte heart[8] = { 0b00011110, 60, 60, 60, 60 , 60, 60, 60};
byte hrmPos[1] = {2};
bool _BLEClientConnected = false;
#define heartRateService BLEUUID((uint16_t)0x180D)
BLECharacteristic heartRateMeasurementCharacteristics(BLEUUID((uint16_t)0x2A37), BLECharacteristic::PROPERTY_NOTIFY);
BLECharacteristic sensorPositionCharacteristic(BLEUUID((uint16_t)0x2A38), BLECharacteristic::PROPERTY_READ);
BLEDescriptor heartRateDescriptor(BLEUUID((uint16_t)0x2901));
BLEDescriptor sensorPositionDescriptor(BLEUUID((uint16_t)0x2901));
class MyServerCallbacks : public BLEServerCallbacks {
void onConnect(BLEServer* pServer) {
_BLEClientConnected = true;
};
void onDisconnect(BLEServer* pServer) {
_BLEClientConnected = false;
}
};
void InitBLE() {
BLEDevice::init("Sensor X");
// Create the BLE Server
BLEServer *pServer = BLEDevice::createServer();
pServer->setCallbacks(new MyServerCallbacks());
// Create the BLE Service
BLEService *pHeart = pServer->createService(heartRateService);
pHeart->addCharacteristic(&heartRateMeasurementCharacteristics);
heartRateMeasurementCharacteristics.addDescriptor(&heartRateDescriptor);
heartRateMeasurementCharacteristics.addDescriptor(new BLE2902());
pHeart->addCharacteristic(&sensorPositionCharacteristic);
sensorPositionCharacteristic.addDescriptor(&sensorPositionDescriptor);
pServer->getAdvertising()->addServiceUUID(heartRateService);
pHeart->start();
// Start advertising
pServer->getAdvertising()->start();
}
void setup() {
Serial.begin(115200);
Serial.println("Start");
InitBLE();
bpm = 1;
rr = 800;
}
void loop() {
// put your main code here, to run repeatedly:
heart[1] = (byte)bpm;
int energyUsed = 3000;
heart[3] = energyUsed / 256;
heart[6] = (byte)bpm;
heart[2] = energyUsed - (heart[2] * 256);
Serial.println(bpm);
Serial.println(rr);
heartRateMeasurementCharacteristics.setValue(heart, 8);
heartRateMeasurementCharacteristics.notify();
sensorPositionCharacteristic.setValue(hrmPos, 1);
rr++;
bpm++;
delay(2000);
}
I have the above code - and I have been looking at this here but I can't figure out how do I pass the RR data over BLE. I set the flags according to the BLE spec shown here. But whenever I use an app to see the data "HRV Logger", it says that I am not transmitted RR data. I thought all I had to do was pass heart[6] data and that would show up as RR. I have dummy information being passed since I'm not connected to any sensors. Help would be helpful, determining how to pass the RR data across, thanks! (for future reference I am using the Sparkfun ESP32, but this shouldn't affect solving the issue since it has to do with protocols)