[maloel]

v2.10.x is eProsima's last LTS version that still supports U20.
We were on v2.11.2, which is already out of support, so any fixes eProsima made for us cannot be on this branch.
Specifically, v2.10.4 includes two of the fixes we asked for:

Feature 3: New max_message_size property to limit output datagrams size (#4807)
Bug fix 31: Fix on_sample_lost notification on best-effort readers for fragmented samples (#4606)

There was a problem when I went to v2.10.4 with the CMake files:

CMake Error in build/third-party/fastdds/src/cpp/CMakeLists.txt:
  export called with target "fastrtps" which requires target "fastcdr" that
  is not in any export set.

CMake Error in build/third-party/fastdds/src/cpp/CMakeLists.txt:
  export called with target "fastrtps" which requires target
  "foonathan_memory" that is not in any export set.

After investigating, it seems v2.11+ made changes in their CMake that were correct and compatible with our code, so when we went back to v2.10 they lost those and our compilation failed. I reported this and so they gave us a special tag that includes these, to be included in v2.10.5 at a later date. For now, we use this special tag.