1. In order to maximize throughput, we need to set the uart print baud rate at 921600 or more (idf.py menuconfig --> Component config --> ESP32-specific --> UART console baud rate --> 921600(or 1500000)) and don't print too much log.
2. We can only test notify or write throughput at the same time, this demo default to test the notify throughput, if want to test the write throughput,
4. Should change the CPU frequency to 160MHZ or 240MHz in the idf.py menuconfig --> Component config ---> ESP32-specific ---> CPU frequency (240 MHz or 160 MHz).
5. Should change the bluetooth controller and Bluedroid run in different Core in the idf.py menuconfig --> Component config ---> Bluetooth ---> The cpu core which bluetooth controller run (Core 0 (PRO CPU)) & Bluedroid Enable ---> The cpu core which Bluedroid run (Core 1 (APP CPU)).