<xacro:macro name="mir_600_wheel_transmission" params="locationprefix">
transmission_interface/SimpleTransmission
hardware_interface/VelocityJointInterface
hardware_interface/VelocityJointInterface
1
</xacro:macro>
<xacro:macro name="mir_600_wheel_transmissions" params="">
<xacro:mir_600_wheel_transmission locationprefix="left"/>
<xacro:mir_600_wheel_transmission locationprefix="right"/>
</xacro:macro>
Double check if those lines of code need to be added in the file "mir_100_wheels.gazebo.xacro" file, due to issues launching gazebo with mir100