Fix a bug: The app will halt if the pebble is disconnect when a message is being transmit.
Notice: need pebble firmware 2.7 above, and Pebble Messenger Pro 7.0! Increase speed about 50%, many improvements in detail. Support black background style. More detail please read Pebble Messenger Pro 7.0 release note.
Speed up showing repeat chars.
Support pebble os 2.4.0 and above. Caution: This App support android companion app only.