login as: pi
pi@192.168.1.67's password:
Linux raspberrypi 5.4.51-v7+ #1327 SMP Thu Jul 23 10:58:46 BST 2020 armv7l

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Sun Aug  9 10:09:16 2020 from 192.168.1.66
pi@raspberrypi:~ $ cd ~/brewblox
pi@raspberrypi:~/brewblox $ brewblox-ctl flash
Please press ENTER when your Spark is connected over USB
INFO       Pulling flasher image...
edge: Pulling from brewblox/firmware-flasher
Digest: sha256:493323d548b6ce2e6a7727db8a394a1d455e27864bed3ac1e4e9a86eca9e1a72
Status: Image is up to date for brewblox/firmware-flasher:edge
docker.io/brewblox/firmware-flasher:edge
INFO       Stopping services...
Removing network brewblox_default
WARNING: Network brewblox_default not found.
INFO       Flashing Spark...
Triggering dfu on port /dev/ttyACM0
[Error: Error: No such file or directory, cannot open /dev/ttyACM0]
No compatible USB devices found