Bumper
This is a ROS message definition.
Source
# A message for Nao's bumpers on the feet
uint8 bumper # which bumper (left or right)
uint8 state # state of the bumper (pressed or released)
uint8 RIGHT=0
uint8 LEFT=1
uint8 BACK=2
uint8 STATE_RELEASED=0
uint8 STATE_PRESSED=1