UIFlow Guide
Establish wireless connection, enable wireless pass-through service (only support M5Stack Fire)
Init ble uart name
Initialise settings, configure wireless device name
BLE UART Writre
Sending data wirelessly
BLE UART remain cache
Checking the number of bytes of data cached by the wireless serial port
BLE UART read all
Read all data in the wireless serial port cache
BLE UART read characters
Read n data from the wireless serial port cache
Establish wireless transmission connection, send on/off to control LED.