User's Manual

HC-08 BLUETOOTH UART COMMUNICATION MODULE USER MANUAL
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21 SET Characteristic UUID
Set command: AT+ TUUID=xxxx
Query command: AT+ TUUID=?
The parameters xxxx must be within the range of 0~F.
The module only one characteristic UUID. The characteristic UUID properties: read,
notify, write_without_response.
Example:
Send: AT+TUUID= FFE1
Return: OK+TUUID=FFE1
Characteristic UUID modified FFE1 (0xFFE1).
Send: AT+ TUUID =?
Return: OK+TUUID=FFE1
Characteristic UUID is FFE0 (0xFFE1).
22 Set the time for automatic sleep
Set command: AT+ AUST=x
Query command: AT+ AUST =?
The time for automatic sleep is 1~300s. The smaller the time it is, the more power is
saved.
In the low power mode, if there is no operation after the activation module, x
seconds will return the low-power mode set by the user.
Example:
Send: AT+ AUST=20
Return: OK+ AUST=20
The time for automatic sleep modified 20s.
Send: AT+ AUST=?
Return: OK+ AUST=20
The time for automatic sleep is 20s.
Note: the default of AUST is 20 seconds. If it is MODE1 low power mode, since the
mode is discoverable and connectable, AUST can be set to a minimum of 1 second in
order to save power. If it is MODE2 low power mode, because the mode is not
discoverable and can not be connected, it is proposed to set up the AUST to 20 seconds
or more to ensure that the module has enough time to connect with other Bluetooth
master after the serial port wake-up.