Frequently Asked Questions¶
How do I fix the “unable to communicate with master!” error?¶
Is your VIPER running and active? If no, please turn it on.
ROS_MASTER_URI set correctly? If no, please set the
ROS_MASTER_URI to the location of your VIPER.
Can you contact the address specified in the
echo $ROS_MASTER_URI http://<VIPER_IP>:11311 ping <VIPER_IP> ping: unknown host <VIPER_IP>
If you get the “unknown host” error, please check your network settings or change the
ROS_MASTER_URI to a resolvable address.
How do I find VIPER IP address?¶
Please refer to VIPER Discovery.