With M2X, a public draft for an open specification for communication between mobile robots and infrastructure components is available for the first time. Companies, manufacturers, and integrators can use the specification for their own developments and test it in existing projects. Public commentary is also intended. M2X, short for Machine to X, was developed by the Chair of Materials Handling and Warehousing at the Technical University of Dortmund and the Fraunhofer Institute for Material Flow and Logistics IML.