Help needed using BT4502 Bluetooth module with Seeduino XIAO

[Baozhu]

BT4502 transmit from UART to BLE app

Yep, I used the app “Serial Bluetooth Terminal” but you have to use a custom bluetooth LE profile with the device. [Screenshot_20200413-184055] You can select the relevant characteristics as they’re listed in the datasheet (FFE4 and FFE9). With these settings, I can communicate bidirectionally, the issue comes with sending data from my microcontroller to the app unfortunately.

Discuss it together here.