ZMQ (Jeromq) - Missing parameter in socket send documentation

I am currently trying to modify the simple hwclient/hwserver example to send a byte array with predefined size to the server. I have seen that basically the functionality is given in the following form:

public boolean send(byte[] data, int off, int length, int flags)

But there seems to be no documentation about the parameter int off. Can anyone tell be, what this parameter does?

Thanks in advance

It would always be 0 if you want complete byte[] to be consumed if you want a partial consumption mention the offset of that Array index.

/**
         * Queues a message created from data, so it can be sent.
         *
         * @param data   the data to send.
         * @param off    the index of the first byte to be sent.
         * @param length the number of bytes to be sent.
         * @param flags  a combination (with + or |) of the flags defined below:
         *               </ul>
         * @return true when it has been queued on the socket and ØMQ has assumed responsibility for the message.
         * This does not indicate that the message has been transmitted to the network.
         */
        public boolean send(byte[] data, int off, int length, int flags)