How to use the mobly.controllers.android_device_lib.adb.AdbError function in mobly

"""Waits for Android framework to broadcast ACTION_BOOT_COMPLETED.

        This function times out after 15 minutes.

        Args:
            timeout: float, the number of seconds to wait before timing out.
                If not specified, no timeout takes effect.
        """
        timeout_start = time.time()

        self.adb.wait_for_device(timeout=timeout)
        while time.time() < timeout_start + timeout:
            try:
                if self.is_boot_completed():
                    return
            except (adb.AdbError, adb.AdbTimeoutError):
                # adb shell calls may fail during certain period of booting
                # process, which is normal. Ignoring these errors.
                pass
            time.sleep(5)
        raise DeviceError(self, 'Booting process timed out')

def _get_persist_command(self):
        """Check availability and return path of command if available."""
        for command in [_SETSID_COMMAND, _NOHUP_COMMAND]:
            try:
                if command in self._adb.shell(['which',
                                               command]).decode('utf-8'):
                    return command
            except adb.AdbError:
                continue
        self.log.warning(
            'No %s and %s commands available to launch instrument '
            'persistently, tests that depend on UiAutomator and '
            'at the same time performs USB disconnection may fail',
            _SETSID_COMMAND, _NOHUP_COMMAND)
        return ''

logpersist_warning = ('%s encountered an error enabling persistent'
                              ' logs, logs may not get saved.')
        # Android L and older versions do not have logpersist installed,
        # so check that the logpersist scripts exists before trying to use
        # them.
        if not self._ad.adb.has_shell_command('logpersist.start'):
            logging.warning(logpersist_warning, self)
            return

        try:
            # Disable adb log spam filter for rootable devices. Have to stop
            # and clear settings first because 'start' doesn't support --clear
            # option before Android N.
            self._ad.adb.shell('logpersist.stop --clear')
            self._ad.adb.shell('logpersist.start')
        except adb.AdbError:
            logging.warning(logpersist_warning, self)

break
        finally:
            # Note, communicate will not contain any buffered output.
            (unexpected_out, err) = proc.communicate()
            if unexpected_out:
                out = '[unexpected stdout] %s' % unexpected_out
                for line in unexpected_out.splitlines():
                    handler(line)

        ret = proc.returncode
        logging.debug('cmd: %s, stdout: %s, stderr: %s, ret: %s',
                      utils.cli_cmd_to_string(args), out, err, ret)
        if ret == 0:
            return err
        else:
            raise AdbError(cmd=args, stdout=out, stderr=err, ret_code=ret)

(ret, out, err) = utils.run_command(args,
                                                shell=shell,
                                                timeout=timeout)
        except psutil.TimeoutExpired:
            raise AdbTimeoutError(cmd=args,
                                  timeout=timeout,
                                  serial=self.serial)

        if stderr:
            stderr.write(err)
        logging.debug('cmd: %s, stdout: %s, stderr: %s, ret: %s',
                      utils.cli_cmd_to_string(args), out, err, ret)
        if ret == 0:
            return out
        else:
            raise AdbError(cmd=args,
                           stdout=out,
                           stderr=err,
                           ret_code=ret,
                           serial=self.serial)