def unsupported_commands(comm_instance, phase, cmd, cmd_type, gcode, *args,
    **kwargs):
    """
    Suppress certain commands, because Grbl cant handle them.
    """
    if cmd.startswith('M110 '):
        return None,
    if cmd == 'M105':
        return '?$G'
    if cmd == 'M400':
        return 'G4 P0'
    if cmd == 'M114':
        return '?'
