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How can I get hcitool/bluetoothctl to recognize my OpenBCI bluetooth dongle?

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I am trying to use an OpenBCI dongle on Ubuntu 20.04.3, the eventual goal being to integrate with ROS (Robot Operating System) and use it as part of a larger system. To do this I need the hci number of the bluetooth dongle, but hcitool dev shows only an empty Devices:.

Typing lsusb shows

Bus 003 Device 008: ID 0403:6015 Future Technology Devices International, Ltd Bridge(I2C/SPI/UART/FIFO)

and the OpenBCI GUI can see the dongle too ((Cyton)/dev/ttyUSB0), but I can't get hcitools or bluetoothctl to find it.

hciconfig scan
Can't get device info: no such device
hcitool lescan
Could not open device: no such device
$bluetoothctl
Agent registered
[bluetooth]# agent on
Agent is already registered
[bluetooth]# scan on
No default controller available

The bluetooth settings in Ubuntu show only "No bluetooth found/Plug in a dongle to use Bluetooth".

In answers to some Raspberry Pi posts, I saw that sudo rfkill list will list blocked devices, but that prints nothing in my case.

The OpenBCI GUI works perfectly, the dongle seems to be doing its job otherwise. The machine is an Intel NUC11.

How can I get the bluetooth dongle's hci number?

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