private void sendBlob(String index, byte[] blob) {

        // Send "blob" containing provided data
        sendInstruction(new GuacamoleInstruction("blob", index,
           BaseEncoding.base64().encode(blob)));

    }
Injects a "blob" instruction into the outbound Guacamole protocol
stream, as if sent by the connected client. "blob" instructions are used
to send chunks of data along a stream.

@param index
    The index of the stream that this "blob" instruction relates to.

@param blob
    The chunk of data to send within the "blob" instruction.
guacamole/src/main/java/org/apache/guacamole/tunnel/InputStreamInterceptingFilter.java