what(): timeout error ROS stack for Bitcraze Crazyflie

[flavia1394]

Good morning, I'm using the ROS stack for Bitcraze Crazyflie, with ROS Indigo and Ubuntu 14.04.
I would like to display the imu sensors with the command:

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rostopic echo /crazyflie/imu

The crazyflie server appears in the rosnode list, but if I run any example I have a what() : timeout error:

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roslaunch crazyflie_demo customLogBlocks.launch uri:=radio://0/80/250K

and this is the output:

Now there are some topics in the rostopic list:

but when I write:

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rostopic echo /crazyflie/imu

nothing happens:

Can you help me?

[whoenig]

That usually means that it couldn't successfully connect. Please double check your uri, also by running

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rosrun crazyflie_tools scan

[flavia1394]

That usually means that it couldn't successfully connect. Please double check your uri, also by running

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rosrun crazyflie_tools scan

Thak you for your answer, I found out that the uri of the file did not corresponded to the uri of the crazyflie, so I modified the launch file with gedit.
And now it works!!!!