##### Document description

This paper introduces the interface protocol of electronic price tag management background and the parameter setting protocol of electronic price tag through Bluetooth communication.

##### Reading object

Technical architect, R&D engineer, test engineer, system operation and maintenance engineer involved in the electronic price tag management system and Bluetooth setting tools.

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##### Update Log

- 2025-6-20  
    Add Bluetooth \[Read configuration information\] parameters: screen height and width  
    Add HTTP-SERVER [Get device information](./API%20interface%20(WIFI)\HTTP-SERVER\Get%20device%20information.md) parameters: screen height and width
- 2025-5-7  
    Add MQTT control instructions: Brightness setting and Device restart
- 2025-3-27  
    Add Bluetooth command: WPA2-Enterprise WiFi network configuration  
    **API interface (WIFI)** -> **HTTP** -> **Get price tag details** Add Parameter Firmware version **version**
- 2025-3-6  
    The action value of the MQTT received message parameter `Power Plan Control` has been changed from `power-ctrl` to `power_ctrl`
- 2025-1-19  
    Modify MQTT control command: Set time zone - The value of the timezone field is in UTC time zone format (e.g. change the original Asia/Shanghai to UTC+08:00)  
    Add MQTT control command: turn on backlight, turn off backlight
- 2025-1-18  
    Add security specifications for Bluetooth communication
- 2024-12-13  
    Add Bluetooth command: Clear media resources, Reboot device
- 2024-12-10 (Firmware version 3.26 and above are supported)  
    Add HTTP-SERVER mode firmware upgrade interface
- 2024-12-9 (Firmware version 3.26 and above are supported)  
    Add Bluetooth command: IP configuration: Use static IP  
    Add Bluetooth command: UI interface layout control: display and hide of top message bar, bottom status bar, system control board, and device QR code  
    HTTP mode modification: Video carousel to video+image carousel  
    MQTT mode added: commands for setting time zone, configuring power plan, clearing resources, factory reset, UI layout control, etc
- 2024-1-20  
    Delete Bluetooth command: Clear price tag resource file  
    Add Bluetooth command: restore factory settings  
    Send Bluetooth command to increase response and return  
    HTTP-SERVER mode adds interface: cleaning storage space  
    HTTP-SERVER mode adds an interface to check files
- 2023-12-4  
    Add application protocol: HTTP-SERVER (working mode)  
    Add Bluetooth command: Read price tag configuration information  
    Add Bluetooth command: clear price tag resource file
- 2023-6-25  
    Add Application Protocol settings (MQTT/HTTP)
- 2023-6-16  
    Add MQTT
- 2023-6-8  
    Add firmware update information
- 2023-4-15  
    This document was created