Transparent Transmission Description - Waveshare RP2040-BLE User Manual

2.10 TRANSPARENT TRANSMISSION DESCRIPTION

1. After the Bluetooth connection, the module automatically enters the transparent transmission
mode. Except for the completely correct AT command, the rest of the data will be transparently
transmitted.
2. The maximum amount of data that can be handled in a single time is 1024 bytes. SPP
recommends that it should not exceed 512 bytes at a time.
3. The MTU (maximum communication packet length) of the mobile phone APP generally
defaults to 20 bytes for 1 data packet; when the data packet sent by the module exceeds 20
bytes, the module will automatically divide the packet according to the set MTU; you can
Modify the MTU to modify the data interaction speed (the larger the MTU, the faster the data
interaction speed).
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