Resolves https://github.com/spring-projects/spring-integration/issues/3410 **cherry-pick to 5.3.x** * Doc polishing. # Conflicts: # spring-integration-ip/src/main/java/org/springframework/integration/ip/udp/UnicastSendingMessageHandler.java # spring-integration-ip/src/test/java/org/springframework/integration/ip/dsl/IpIntegrationTests.java # src/reference/asciidoc/whats-new.adoc