resolve error in unit test on CI build farm. Probably a timing issue when a message is published from within a callback.
resolve error in unit test on CI build farm. Probably a timing issue when a message is published from within a callback.

Signed-off-by: Staschulat Jan <e475a11f0a81ee8b8f81740975325a87bd2cd795@de.bosch.com>

ros2/rclc,ros2/rclc