ESP32 Bluetooth connection status - c++

Question

I am running into some problems finding a solution when it comes to performing some form of Bluetooth connection check for my project that will allow me to have a connection status light.
My project consists of creating a Bluetooth speaker that has Led Strips controlled over Bluetooth serial (an app will be made to handle this) and audio stream over Bluetooth from a single ESP32.
I have found plenty of examples and had success with performing an spp callback event, however, of course this only works if I connect to the Bluetooth serial side of things through my 'Serial Bluetooth Terminal' app on my phone. If I just go into my phone Bluetooth list and connect to the audio side of things, nothing is registered, which isn't very useful for a Bluetooth speaker!
Basically I really need some help finding a way of registering that a device has connected to the Bluetooth audio so that I can have some form of indication light to tell the user that they are successfully connected to the speaker to play music.
Below is my code:
#include <btAudio.h> //<-------this is the library that I am using to handle Bluetooth audio to an external I2s DAC
#include "BluetoothSerial.h"
#include <FastLED.h>
TaskHandle_t Task1;
//POWER/BT-LIGHT-SETUP----------------------------------------
int powerPinR = 4;
int powerPinG = 16;
int powerPinB = 17;
bool BTisConnected;
//FAST-LED-STUFF----------------------------------------------
CRGB leds[NUM_STRIPS][NUM_LEDS];
CRGB leds_temp[NUM_STRIPS][NUM_LEDS/2];
//BLUETOOTH-SETUP---------------------------------------------
btAudio audio = btAudio("");
BluetoothSerial SerialBT;
//CONNECTION-CHECK--------------------------------------------
void callback(esp_spp_cb_event_t event, esp_spp_cb_param_t*param){
if(event == ESP_SPP_SRV_OPEN_EVT){
Serial.println("Client Connected");
BTisConnected = true;
}
else {
BTisConnected = false;
}
}
//------------------------------------------------------------
void setup() {
//CORE-1-INITIALISE
xTaskCreatePinnedToCore(
codeForTask1, /* Task function. */
"Task_1", /* name of task. */
1000, /* Stack size of task */
NULL, /* parameter of the task */
1, /* priority of the task */
&Task1, /* Task handle to keep track of created task */
0); /* Core */
//POWER/BLUETOOTH-CONNECTION-LIGHT-SETUP
pinMode(powerPinR, OUTPUT);
pinMode(powerPinG, OUTPUT);
pinMode(powerPinB, OUTPUT);
digitalWrite (powerPinR, HIGH);
digitalWrite (powerPinG, HIGH);
digitalWrite (powerPinB, HIGH);
//COOLDOWN-DELAY
delay(3000);
//AUDIO-INITIALISE
audio.begin();
int bck = 26;
int ws = 27;
int dout = 25;
audio.I2S(bck, dout, ws);
//LED-STRIP-SETUP-&-CLEAR-ALL
FastLED.addLeds<WS2812B,STRIP1PIN,GRB>(leds[0], NUM_LEDS);
FastLED.addLeds<WS2812B,STRIP2PIN,GRB>(leds[1], NUM_LEDS);
FastLED.clear();
FastLED.show();
//SERIAL-INITIALISE-&-CLIENT-CONNECTION-CHECK
Serial.begin(115200);
SerialBT.begin("Pilot"); //<-----BLUETOOTH NAME
SerialBT.register_callback(callback); //<-- SerialBT connection check works perfectly, but nothing for audio connection! :(
}
//CORE-0-VOID-LOOP--------------------------------------------
void codeForTask1( void * parameter )
{
for (;;) {
manageData();
delay(10);
}
}
//CORE-1-VOID-LOOP--------------------------------------------
void loop() {
BTconnectionCheck();
playScene();
}
//MANAGE-INCOMING-BLUETOOTH-SERIAL-DATA-----------------------------------------------
void manageData() {
//READ FROM SERIAL AND PARSE OUT ** READ FROM SERIAL AND PARSE OUT ** READ FROM SERIAL AND PARSE OUT **
char rawData[100] = "";
char keyword[] = "Mydata=";
if (SerialBT.available() > 0) {//new data in
size_t byteCount = SerialBT.readBytesUntil('\n', rawData, sizeof(rawData) - 1); //read in data to buffer
rawData[byteCount] = NULL;//put an end character on the data
const char delimiter[] = ",";
char parsedStrings[5][8]; //first number = how many bits of data - 2nd number = max size of eeach data
int dataCount = 0;
int dataPosition = 0;
char *token = strtok(&rawData[dataPosition], delimiter);//look for first piece of data after keyword until comma
if (token != NULL && strlen(token) < sizeof(parsedStrings[0])) {
strncpy(parsedStrings[0], token, sizeof(parsedStrings[0]));
dataCount++;
} else {
Serial.println("token to big");
strcpy(parsedStrings[0], NULL);
}
for (int i = 1; i < 5; i++) {
token = strtok(NULL, delimiter);
if (token != NULL && strlen(token) < sizeof(parsedStrings[i])) {
strncpy(parsedStrings[i], token, sizeof(parsedStrings[i]));
dataCount++;
} else {
Serial.println("token to big");
strcpy(parsedStrings[i], NULL);
}
}
if (dataCount == 5) {
scene = atoi (parsedStrings[0]);
hue = atoi(parsedStrings[1]);
saturation = atoi(parsedStrings[2]);
brightness = atoi(parsedStrings[3]);
eventInterval = atol (parsedStrings[4]);
}
}
}
//BLUETOOTH-CONNECTION-CHECK---------------------------------------------------------
void BTconnectionCheck(){
SerialBT.register_callback(callback);
if (BTisConnected == true){
bluetoothConnected();
}
else {
bluetoothSearch();
}
}
void bluetoothSearch(){
digitalWrite (powerPinR, LOW);
digitalWrite (powerPinG, LOW);
digitalWrite (powerPinB, HIGH);
}
void bluetoothConnected(){
digitalWrite (powerPinR, HIGH);
digitalWrite (powerPinG, LOW);
digitalWrite (powerPinB, HIGH);
}
I have cut lots of the code to do with the LEDs out but its still quite long, If it would help to have a more condensed version then I will chop it down further. Or if it helps to have the full code then I can also post it.
Any help would be greatly appreciated as I am well and truly stuck with this one and its a pretty important part of the project.
Thanks in advance!