How to use the devlib.exception.TargetTransientError function in devlib

def execute(self, command, timeout=None, check_exit_code=False,
                as_root=False, strip_colors=True, will_succeed=False):
        try:
            return adb_shell(self.device, command, timeout, check_exit_code,
                             as_root, adb_server=self.adb_server, su_cmd=self.su_cmd)
        except TargetStableError as e:
            if will_succeed:
                raise TargetTransientError(e)
            else:
                raise

self.logger.debug('Waiting for the shell prompt.')
            tty.expect(target.shell_prompt)

            self.logger.debug('Waiting for IP address...')
            wait_start_time = time.time()
            try:
                while True:
                    tty.sendline('ip addr list eth0')
                    time.sleep(1)
                    try:
                        tty.expect(r'inet ([1-9]\d*.\d+.\d+.\d+)', timeout=10)
                        return tty.match.group(1).decode('utf-8')
                    except pexpect.TIMEOUT:
                        pass  # We have our own timeout -- see below.
                    if (time.time() - wait_start_time) > self.ready_timeout:
                        raise TargetTransientError('Could not acquire IP address.')
            finally:
                tty.sendline('exit')  # exit shell created by "su" call at the start

if int(exit_code):
                message = ('Got exit code {}\nfrom target command: {}\n'
                           'OUTPUT: {}\nSTDERR: {}\n')
                raise TargetStableError(message.format(exit_code, command, output, error))
            elif re_search:
                message = 'Could not start activity; got the following:\n{}'
                raise TargetStableError(message.format(re_search[0]))
        else:  # not all digits
            if re_search:
                message = 'Could not start activity; got the following:\n{}'
                raise TargetStableError(message.format(re_search[0]))
            else:
                message = 'adb has returned early; did not get an exit code. '\
                          'Was kill-server invoked?\nOUTPUT:\n-----\n{}\n'\
                          '-----\nSTDERR:\n-----\n{}\n-----'
                raise TargetTransientError(message.format(raw_output, error))

    return output + error

def adb_disconnect(device, adb_server=None):
    _check_env()
    if not device:
        return
    if ":" in device and device in adb_list_devices(adb_server):
        adb_cmd = get_adb_command(None, 'disconnect', adb_server)
        command = "{} {}".format(adb_cmd, device)
        logger.debug(command)
        retval = subprocess.call(command, stdout=open(os.devnull, 'wb'), shell=True)
        if retval:
            raise TargetTransientError('"{}" returned {}'.format(command, retval))

def _check_ready(self):
        """
        Check if the gem5 platform is ready
        """
        if not self.ready:
            raise TargetTransientError('Gem5 is not ready to interact yet')

port=None,
                  timeout=10,
                  original_prompt=None):
    _check_env()
    start_time = time.time()
    while True:
        conn = TelnetPxssh(original_prompt=original_prompt)

        try:
            conn.login(host, username, password, port=port, login_timeout=timeout)
            break
        except EOF:
            timeout -= time.time() - start_time
            if timeout <= 0:
                message = 'Could not connect to {}; is the host name correct?'
                raise TargetTransientError(message.format(host))
            time.sleep(5)

    conn.setwinsize(500, 200)
    conn.sendline('')
    conn.prompt()
    conn.setecho(False)
    return conn