Specifications

HM-BT4502 V1.0
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d) Advertisement Period, It is restored to 2 (200ms).
e) Connection Interval, it is restored to30ms.
f) Product Identification Code, it is restored to0x00, 0x00.
g) Tx Power, it is restored to 0dBm.
h) Custom Advertisement Length, it is restored to 0.
i) Custom Advertisement Data, it is restored to all 0. Use the default
advertisement data instead of custom advertisement data.
j) Enable Mode, it is restored to 0, the default is the level enable mode.
10 BLE Protocol Description (APP Interface)
10.1 Pass-through Data Channel【Service UUID：0xFFE0】
Characteristic UUID
Privilege
Bytes
Default Value
Remark
FFE9 (handle: 0x0013)
Write
20
None
APP Write data to module
and output to UART TX.
FFE4 (handle: 0x000E)
notify
20
None
Notify the data from UART
RX to BLE APP.
Table 3. Pass-through Data Channel Service
Note: Bluetooth input is forwarded to serial output. After APP writes to this
channel through the BLE API interface, the data will be output from the serial
port TX. Details see the chapter of Serial Pass-through Protocol Description
(Bridging Mode).
Serial input is forwarded to Bluetooth output. If the notification