I have missed that the sensor enters the "STATE_CALIBRATE_DONE" state
after the calibration. From the reverse-engineered sources it seems to me
that in this mode, the sensor will no longer process CMD-SELECT messages.

This commit should fix this by cutting off NACKs to the sensor and
letting it reboot.

Jakub Vaněk authored 1 year ago and Václav Jelínek committed 1 year ago

This is essentially replaced by the wait-on-access solution implemented
in commit 959b6b6a. The sensor code
will wait for the sensor once the user tries to access it.

The wait_for_connection() function can still be useful, though - with
reasonable certainty, it ensures that future accesses to the sensor
will not block (barring the situation that the user briefly unplugs
the sensor).

Now they can be imported simply by writing

from lib.ev3 import ColorSensor