src/main/java/com/alipay/remoting/rpc/RpcClient.java
public Connection createStandaloneConnection(String addr, int connectTimeout)
                                                                                 throws RemotingException {
        return this.connectionManager.create(addr, connectTimeout);
    }
public Connection createStandaloneConnection(String addr, int connectTimeout)
                                                                                 throws RemotingException {
        return this.connectionManager.create(addr, connectTimeout);
    }
Create a stand alone connection using address, address format example - 127.0.0.1:12200 <br>
<p>
Notice:<br>
<ol>
<li>Each time you can this method, will create a new connection.
<li>Bolt will not control this connection.
<li>You should use {@link #closeStandaloneConnection} to close it.
</ol>

@param addr
@param connectTimeout
@return
@throws RemotingException