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Serial port communication between nRf52840 dongle and Raspberry pi 4 using Ble.

I need to pass a stream of data from raspberry pi 4 to PC through Ble. I can successfully build and run \examples\peripheral\usbd_ble_uart. It can communicate with my android phone using nRF connect app.

I like to connect the nRf52840 to raspberry pi and work through serial communication.

sudo bluetoothctl
# agent on
#default-agent
# scan on
# pair 98:D3:31:xx:xx:xx
# trust 98:D3:31:xx:xx:xx
# quit

sudo rfcomm connect hci0 98:D3:31:xx:xx:xx

It shows the error Can't connect RFCOMM socket: Host is down

But I can do the same step for HC-05 Bluetooth module and work well.

Is there any way to tackle this problem?
any comments appreciate
Thanks
Anas

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