BLEDevice
init()
Description: create a BLE device
createServer()
Description: create BLE server
BLEServer
createService()
Description: create a BLE service
setCallbacks()
Description: create server callback function
start()
Description: turn off server
getAdvertising()
Description: configure advertising function
BLEService
createCharateristic()
Description: create the characteristic value of the service
#### BLECharacteristic
setCallbacks()
Description: set characteristic value callback function
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