command_ret_t do_echo(cmd_tbl_t *cmdtp, uint_fast8_t flag, int argc, char * const argv[]);
command_ret_t do_sleep(cmd_tbl_t *cmdtp, uint_fast8_t flag, int argc, char * const argv[]);
command_ret_t do_echo(cmd_tbl_t *cmdtp, uint_fast8_t flag, int argc, char * const argv[]);
command_ret_t do_sleep(cmd_tbl_t *cmdtp, uint_fast8_t flag, int argc, char * const argv[]);