When I run: $ roslaunch hokuyonode hokuyotest.launch

I get the following error:

roslaunch hokuyo_node hokuyo_test.launch
... logging to /home/rkrs/.ros/log/aa4e49d8-c248-11e2-bdff-bc6a299c667c/roslaunch-bbone2-1184.log

Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://bbone2:56486/

SUMMARY
---------

PARAMETERS
  * /hokuyo/calibrate_time
  * /hokuyo/intensity
  * /hokuyo/port
  * /rosdistro
  * /rosversion


NODES
  /
    hokuyo (hokuyo_node/hokuyo_node)

ROS_MASTER_URI=http://localhost:11311

core service [/rosout] found
process[hokuyo-1]: started with pid [1139]

core service [/rosout] found
process[hokuyo-1]: started with pid [2955]
[ERROR] [1369266308.601881517]: Exception thrown while opening Hokuyo.
timeout reached (in hokuyo::laser::laserReadline) You may find further details at http://www.ros.org/wiki/hokuyo_node/Troubleshooting

I found in the code that this timeout is reached if retval==0.

I've run port config and confirmed it is as the tutorial reports it should be:

$ ls -l /dev/ttyACM0
crw-rw-rw- 1 root dialout 166, 0 May 22 23:48 /dev/ttyACM0

getID also fails to retrieve the Hokuyo ID

$ rosrun hokuyo_node getID /dev/ttyACM0

with the same error returned as above.

This same Hokuyo, USB cable, et. al. works fine when attached to the PC and run under ROS Fuerte. The BeagleBone is running ROS Groovy.

Any ideas what is causing this error?