Bluetooth mode often disconnects from iOS devices

[vedranMv]

There seems to be a problem when using bluetooth speaker with iOS devices, they will unpair shortly after they started streaming music.

Looking into existing problems with iOS and ESP32:

• https://stackoverflow.com/questions/56498186/esp32-bluetooth-connection-disconnects-when-finished-with-reading-buffer
• NimBLE - immediate disconnect when BLE key store fills and device changes address (IDFGH-3586) espressif/esp-idf#5530
• https://developer.apple.com/forums/thread/129969
• https://www.esp32.com/viewtopic.php?t=5976&start=10

[vedranMv]

Related to bluetooth buffer eating up all the heap. For some reason, buffer is not being emptied, consuming over 50kB

While connected to Windows PC or android phone, buffer seems to be emptied before running out of space