The system time is the time of the master clock, typically the
                computer clock of the main onboard computer.

                time_unix_usec            : Timestamp of the master clock in microseconds since UNIX epoch. (uint64_t)
                time_boot_ms              : Timestamp of the component clock since boot time in milliseconds. (uint32_t)

def system_time_send(self, time_unix_usec, time_boot_ms, force_mavlink1=False):
                '''
                The system time is the time of the master clock, typically the
                computer clock of the main onboard computer.

                time_unix_usec            : Timestamp of the master clock in microseconds since UNIX epoch. (uint64_t)
                time_boot_ms              : Timestamp of the component clock since boot time in milliseconds. (uint32_t)

                '''
                return self.send(self.system_time_encode(time_unix_usec, time_boot_ms), force_mavlink1=force_mavlink1)