* Refs #6840. Update spdlog dependency.

* Refs #6840. Fix ProxyClient update state.

* Refs #6840. Add state mutex in ProxyClient.

* Refs #6840. Fix Windows UDP send_message return.

* Refs #6840. Increate client dead time to 5s.

* Refs #6840. Increate version number to 1.1.5.