DDS_Test.xml

<?xml version="1.0" encoding="UTF-8"?>
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 works of the Software.  Licensee has the right to distribute object form only
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 use the software.
 -->
<dds>
    <!-- types -->
    <types>
    <module name="openadx_msgs">
    <module name="msg">
    <module name="dds_">
      <struct name="InnerType">
        <member name="id_" type="int32"/>
        <member name="x_" type="int32"/>
        <member name="y_" type="int32"/>
        <member name="v_rad_" type="int32"/>
        <member name="a_rad_" type="int32"/>
      </struct>
      </module>
      </module>
      </module>
      <module name="openadx_msgs">
      <module name="msg">
      <module name="dds_">
      <struct name="ShapeType" extensibility="extensible">
        <member name="id_" type="int32"/>
        <member name="objects_" type="nonBasic" nonBasicTypeName="openadx_msgs::msg::dds_::InnerType" sequenceMaxLength="2147483647"/>
      </struct>
      </module>
      </module>
      </module>
    </types>

    <!-- Qos Library -->
    <qos_library name="QosLibrary">
      <qos_profile name="DefaultProfile" base_name="BuiltinQosLibExp::Generic.StrictReliable" is_default_qos="true">
        <datawriter_qos>
                <property>
                    <value>
                        <element>
                        <name>dds.data_writer.history.memory_manager.fast_pool.pool_buffer_max_size</name>
                        <value>4096</value>
                        </element>
                    </value>
                </property>
        </datawriter_qos>
        <participant_qos>
          <transport_builtin>
            <mask>UDPV4 | SHMEM</mask>
          </transport_builtin>
        </participant_qos>
      </qos_profile>
      <!-- Turn on monitoring -->
      <!-- Begin Monitoring
				<property>
					<value>
						<element>
							<name>rti.monitor.library</name>
							<value>rtimonitoring</value>
						</element>
						<element>
							<name>rti.monitor.create_function_ptr</name>
							<value>$(NDDS_MONITOR)</value>
						</element>
					</value>
				</property>
				 End Monitoring -->
    </qos_library>

    <!-- Domain Library -->
    <domain_library name="MyDomainLibrary">
      <domain name="MyDomain" domain_id="0">
        <register_type name="openadx_msgs::msg::dds_::ShapeType" type_ref="openadx_msgs::msg::dds_::ShapeType"/>
        <topic name="Square" register_type_ref="openadx_msgs::msg::dds_::ShapeType"/>
      </domain>
    </domain_library>

    <!-- Participant library -->
    <domain_participant_library name="MyParticipantLibrary">
      <domain_participant name="PubProfile" domain_ref="MyDomainLibrary::MyDomain">
        <publisher name="MyPublisher">
          <data_writer name="VehicleObjectWriter" topic_ref="Square"/>
        </publisher>
      </domain_participant>
      <domain_participant name="SubProfile" domain_ref="MyDomainLibrary::MyDomain">
        <subscriber name="MySubscriber">
          <data_reader name="MySquareReader" topic_ref="Square"/>
        </subscriber>
      </domain_participant>
    </domain_participant_library>

</dds>

Look at the seqMaximumLength. In my case it is MAX_INT_32 i.e. 2147483647. Kindly replace this and see the difference.