Maven Dependency
protobuf-rpc-pro is available via the maven central repository http://repo1.maven.org/maven2. The demo examples are available under the artifactId “protocol-rpc-pro-demo”.
<dependency>
<groupId>com.googlecode.protobuf-rpc-pro</groupId>
<artifactId>protobuf-rpc-pro-duplex</artifactId>
<version>3.3.4</version>
<type>jar</type>
</dependency>