Bluetooth Maximum Packet Length Mtu Configuration; Uuid Configuration; Broadcast Data Can Be Switched - Ebyte E104-BT51 User Manual

Cc2640r2f ble5.0 low power consumption, bluetooth to serial port module

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Chengdu Ebyte Electronic Technology Co.,Ltd.

5.9 Bluetooth maximum packet length MTU configuration

MTU is an abbreviation of the communication term Maximum Transmission Unit (MTU), which refers to the

maximum packet size (in bytes) that can be passed on a layer of a communication protocol. This parameter is usually

related to the communication interface (network interface card, serial port, etc.).

The E104-BT51 module supports the long packet standard of Bluetooth 5.0. You can configure the maximum single

packet data length of Bluetooth through the AT command "AT + MTU = xx". 251 bytes by default,27 to 251 bytes

available.Increasing the packet length can realize the large packet data transmission of Bluetooth. For details on setting

command, refer to 6.27 Querying and Setting the MTU Length.

Note: After the packet length is configured, it will take effect on the next Bluetooth connection. Due to some hosts

do not support parameter change requests initiated by slaves, there may be a set MTU length that does not take effect

after connection, which is normal.

The module supports flexible UUID configuration. You can command "AT + UUIDTYPE = 1" to enable the 128-bit

UUID function. You can customize the transparent transmission service UUID,

and sending characteristic field UUID via commands "AT + + SVRUUID = xx", "AT + READUUID = xx", and "AT +

WRITEUUID = xx". UUID, of which xx represents a hexadecimal number. For details on setting method, refer to 6.28

Querying and Setting the UUID Length of the Transparent Transmission Service. This function can solve the problem of

mismatch with UUID of APP communication, meet more custom requirements, and have wider practicability.

The broadcast of the E104-BT51 is divided into general broadcast and iBeacon broadcast. It supports that command

can configure and select the broadcast mode.

General broadcast packet format:

The broadcast information includes advertising and scan respone, advertising is the broadcast message sent actively,

and scan respone is the broadcast message returned after receiving the host scan request.

Advertising：

Fixed field

Len

020106

3-14

Vendor field

Manufa data

0xFF

Configurable, Max 26 bytes

E104-BT51 User Manual

receiving characteristic field UUID,

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