__init__(self,
topic,
msg_type,
cond_cb,
max_checks=-1,
input_keys=[],
output_keys=[])
(Constructor)
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State constructor
@type topic string
@param topic the topic to monitor
@type msg_type a ROS message type
@param msg_type determines the type of the monitored topic
@type max_checks int
@param max_checks the number of messages to receive and evaluate. If cond_cb returns False for any
of them, the state will finish with outcome 'invalid'. If cond_cb returns True for
all of them, the outcome will be 'valid'
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