message grSim_RobotReplacement {
required double x=1;
required double y=2;
required double dir=3;
required uint32 id=4;
required bool yellowteam=5;
}

message grSim_BallReplacement {
required double x=1;
required double y=2;
required double vx=3;
required double vy=4;
}

message grSim_Replacement {
optional grSim_BallReplacement ball = 1;
repeated grSim_RobotReplacement robots = 2;
}