! Function scans mbed.htm to get information about TargetID.
        @param mount_point mbed mount point (disk / drive letter)
        @return Function returns targetID, in case of failure returns None.
        @details Note: This function should be improved to scan variety of boards'
          mbed.htm files

def _read_htm_ids(self, mount_point):
        """! Function scans mbed.htm to get information about TargetID.
        @param mount_point mbed mount point (disk / drive letter)
        @return Function returns targetID, in case of failure returns None.
        @details Note: This function should be improved to scan variety of boards'
          mbed.htm files
        """
        result = {}
        target_id = None
        for line in self._htm_lines(mount_point):
            target_id = target_id or self._target_id_from_htm(line)
        return target_id, result