i want to do simple data transfer and why blueetooth serial terminal was not be able to detect the device?

i go through the nsu code but which api was used to transfer the data?

The data is queued for transfer over the NUS service through the call to ble_nus_data_send function.

Best regards,
Karl

ble_nus_data_send is this function depends on the service?

which function was used to receive the data?

if i disable the uart and try to print on display it was not working?