Setup a MAVLink2 signing key. If called with secret_key of all zero
                and zero initial_timestamp will disable signing

                target_system             : system id of the target (uint8_t)
                target_component          : component ID of the target (uint8_t)
                secret_key                : signing key (uint8_t)
                initial_timestamp         : initial timestamp (uint64_t)

def setup_signing_send(self, target_system, target_component, secret_key, initial_timestamp, force_mavlink1=False):
                '''
                Setup a MAVLink2 signing key. If called with secret_key of all zero
                and zero initial_timestamp will disable signing

                target_system             : system id of the target (uint8_t)
                target_component          : component ID of the target (uint8_t)
                secret_key                : signing key (uint8_t)
                initial_timestamp         : initial timestamp (uint64_t)

                '''
                return self.send(self.setup_signing_encode(target_system, target_component, secret_key, initial_timestamp), force_mavlink1=force_mavlink1)