Add timeout to wait_for_server and wait_for_result #203
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Currently
sendMsg()does not return when action server does not exist or no result is sent because timeout ofwait_for_server()andwait_for_result()is set to zero.Some users want to escape the function even if action cannot be executed.
https://github.com/jsk-ros-pkg/jsk_robot/blob/34a129462403878c9b4c9c86c1aa9b38d506c143/jsk_fetch_robot/jsk_fetch_startup/scripts/battery_warning.py#L34
jsk-ros-pkg/jsk_robot#1589 (comment)