Parameters length is able to be over 127 bytes.

When the received message has user data over 127 bytes,
occur the parse error exception because using readByte().
Therefore we use readUnsignedByte() for reading parameters length.
Signed-off-by: kyunga kim <kyunga1.kim@lge.com>
Change-Id: I195807ee59a0d9117e0d835a4b3c355635337be0
(cherry picked from commit 700e7df9a0ac480e688d37786c0c146d5d1e406d)