[RoboMaker] Where to get ROBOMAKER_ROBOT_APP_IP and ROBOMAKER_SIM_APP_IP when running a simulation job with images

Hello @AWS-User-0325661

We recently published a new blog article that describes in depth the process to create and run ROS docker containers in AWS RoboMaker. Hopefully this can be a helpful resource!

Once a VPC is configured, the IP of the underlying simulation job should be available when using Type: General (your container image) via the environment variables ROBOMAKER_SIM_APP_IP and ROBOMAKER_ROBOT_APP_IP.

In the blog, we include a sample JSON file with parameters for create-simulation-job. Here, we set the following environment variables.

"ROS_IP": "ROBOMAKER_SIM_APP_IP",
"ROS_MASTER_URI": "http://ROBOMAKER_ROBOT_APP_IP:11311",
"GAZEBO_MASTER_URI": "http://ROBOMAKER_SIM_APP_IP:11345"

In ROS1, this will enable you to connect the Robot and Simulation Application containers together, on a shared ROS core.

If it is an external process requiring the IP address, you could use AWS Step Functions to launch the simulation jobs (either individually, or in a batch) - then run DescribeSimulationJob API call (through a Lambda function using boto3 as an example) to get the list of IPs for a given job in the networkInterface attribute.