[ERROR][1500554860.080234091]: Exception thrown while opening Hokuyo.
Failed to open port:/dev/ttyACM0. Permission denied (errno = 13). You probably don't havepremission to open the port for reading and writing. (inhokuyo::laser::open) You may find further details athttp://www.ros.org/wiki/hokuyo_node/Troubleshooting
显然这种错误显示是没有读写权限,可能的原因是不正常插拔了,或者不小心碰到了
然后之前给的权限没有了,每插拔一次都需要重新对/dev/ttyACM0赋777权限
[ERROR][1500554250.649659560]: Exception thrown while opening Hokuyo.
Device /dev/ttyACM0is already locked. Try 'lsof| grep /dev/ttyACM0' to find other processes that currently have theport open. (in hokuyo::laser::open) You may find further details athttp://www.ros.org/wiki/hokuyo_node/Troubleshooting