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NRF sniffer UART baud rate

Hi, I'm trying to use an MDBT40 based board as a sniffer using the NRF sniffer firmware. I'm guessing I just need UART -> USB to talk to the chip, so I've hooked it up to an Arduino which is basically reading from UART and writing to USB console (and the other way around).

I flashed the firmware to the MDBT40 module. Do I need to flash the softdevice also?

I'm getting data through, but at this point it's just rubbish. What is the UART baud rate in the sniffer firmware? Is the sniffer source code available somewhere?

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