Fix/mqtt client empty client name

[pljakobs]

hopefully now conforming to the coding style rules

[what-the-diff]

PR Summary

• Added Non-Empty Client Name Verification in Connect Method
  We've incorporated a new rule in the connect process that verifies the clientName is not left blank. If it's empty, an error log will be generated to alert us. This helps us maintain solid connection integrity and improve troubleshooting.

[pljakobs]

I hope this now is ok. Having to run clang-8 on Fedora 40 is not ideal, I ended up creating a container to run it in.

[mikee47]

I hope this now is ok. Having to run clang-8 on Fedora 40 is not ideal, I ended up creating a container to run it in.

I use a stand-alone build of clang-format-8 which you can find here https://github.com/muttleyxd/clang-tools-static-binaries/releases/tag/master-32d3ac78. Something like:

cd $SMING_HOME
wget https://github.com/muttleyxd/clang-tools-static-binaries/releases/download/master-32d3ac78/clang-format-8_linux-amd64
export CLANG_FORMAT=/opt/clang-format-8
mv clang-format-8_linux-amd64 $CLANG_FORMAT
chmod +x $CLANG_FORMAT
make cs