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BLE sniffer on dongle, error in Python

Hi. So, pretty sure I've got the firmware installed right and plugging the dongle in creates a "/dev/tty.usbmodem1101" entry. Problem is I have a crash in Python:

extcap % ./nrf_sniffer_ble.sh --extcap-interfaces
extcap {version=3.1.0}{display=nRF Sniffer for Bluetooth LE}{help=https://www.nordicsemi.com/Software-and-Tools/Development-Tools/nRF-Sniffer-for-Bluetooth-LE}
Traceback (most recent call last):
  File "/Users/davep/.config/wireshark/extcap/./nrf_sniffer_ble.py", line 619, in <module>
    extcap_interfaces()
  File "/Users/davep/.config/wireshark/extcap/./nrf_sniffer_ble.py", line 134, in extcap_interfaces
    for interface_port in get_interfaces():
  File "/Users/davep/.config/wireshark/extcap/./nrf_sniffer_ble.py", line 125, in get_interfaces
    devices = UART.find_sniffer(write_data=False)  # Try non-intrusive search, set argument to True for intrusive search
  File "/Users/davep/.config/wireshark/extcap/SnifferAPI/UART.py", line 59, in find_sniffer
    reader = Packet.PacketReader(portnum=port, baudrate=rate)
  File "/Users/davep/.config/wireshark/extcap/SnifferAPI/Packet.py", line 72, in __init__
    self.uart = UART.Uart(portnum, baudrate)
  File "/Users/davep/.config/wireshark/extcap/SnifferAPI/UART.py", line 106, in __init__
    self.ser = serial.Serial(
  File "/opt/homebrew/lib/python3.9/site-packages/serial/serialutil.py", line 244, in __init__
    self.open()
  File "/opt/homebrew/lib/python3.9/site-packages/serial/serialposix.py", line 332, in open
    self._reconfigure_port(force_update=True)
  File "/opt/homebrew/lib/python3.9/site-packages/serial/serialposix.py", line 517, in _reconfigure_port
    termios.tcsetattr(
termios.error: (22, 'Invalid argument')

This is an M1 Mac so I might be being my own worst enemy here. Any ideas?

Thanks,

Dave

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