public ChannelFuture writeOneOutbound(Object msg, ChannelPromise promise) {
        if (checkOpen(true)) {
            return write(msg, promise);
        }
        return checkException(promise);
    }
Writes one message to the outbound of this {@link Channel} and does not flush it. This
method is conceptually equivalent to {@link #write(Object, ChannelPromise)}.

@see #writeOneInbound(Object, ChannelPromise)
plc4j/transports/test/src/main/java/io/netty/channel/embedded/Plc4xEmbeddedChannel.java