upload data
is clock sync fixed
log use fopen fprintf instead of bulky echo
abs and relative start
0817
parsing rmc
0814
Merge remote-tracking branch 'origin/master' into merge

Conflicts:
	acoustic_modem.c
bb_timestamp added
Merge remote-tracking branch 'origin/lib_sync' into merge

Conflicts:
	acoustic_modem.c
sync_timeout
Merge remote-tracking branch 'origin/gps' into merge
Merge remote-tracking branch 'origin/scheduler' into merge
Merge remote-tracking branch 'origin/master_upgrade' into merge
0814