<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_baudrate_ex_message(baudrate_ex):
 """ Converts a given baud rate value for systec USB-CANmoduls to the appropriate message string. :param BaudrateEx baudrate_ex: Bus Timing Registers (see enum :class:`BaudrateEx`) :return: Baud rate message string. :rtype: str """

        baudrate_ex_msgs = {
            Baudrate.BAUDEX_AUTO: "auto baudrate",
            Baudrate.BAUDEX_10kBit: "10 kBit/sec",
            Baudrate.BAUDEX_SP2_10kBit: "10 kBit/sec",
            Baudrate.BAUDEX_20kBit: "20 kBit/sec",
            Baudrate.BAUDEX_SP2_20kBit: "20 kBit/sec",
            Baudrate.BAUDEX_50kBit: "50 kBit/sec",
            Baudrate.BAUDEX_SP2_50kBit: "50 kBit/sec",
            Baudrate.BAUDEX_100kBit: "100 kBit/sec",
            Baudrate.BAUDEX_SP2_100kBit: "100 kBit/sec",
            Baudrate.BAUDEX_125kBit: "125 kBit/sec",
            Baudrate.BAUDEX_SP2_125kBit: "125 kBit/sec",
            Baudrate.BAUDEX_250kBit: "250 kBit/sec",
            Baudrate.BAUDEX_SP2_250kBit: "250 kBit/sec",
            Baudrate.BAUDEX_500kBit: "500 kBit/sec",
            Baudrate.BAUDEX_SP2_500kBit: "500 kBit/sec",
            Baudrate.BAUDEX_800kBit: "800 kBit/sec",
            Baudrate.BAUDEX_SP2_800kBit: "800 kBit/sec",
            Baudrate.BAUDEX_1MBit: "1 MBit/s",
            Baudrate.BAUDEX_SP2_1MBit: "1 MBit/s",
            Baudrate.BAUDEX_USE_BTR01: "BTR0/BTR1 is used",
        }
        return baudrate_ex_msgs.get(baudrate_ex, "BTR is unknown (user specific)")