Time synchronization message.

                tc1                       : Time sync timestamp 1 (int64_t)
                ts1                       : Time sync timestamp 2 (int64_t)

def timesync_send(self, tc1, ts1, force_mavlink1=False):
                '''
                Time synchronization message.

                tc1                       : Time sync timestamp 1 (int64_t)
                ts1                       : Time sync timestamp 2 (int64_t)

                '''
                return self.send(self.timesync_encode(tc1, ts1), force_mavlink1=force_mavlink1)