public Queue<Object> outboundMessages() {
        if (outboundMessages == null) {
            outboundMessages = new ArrayDeque<>();
        }
        return outboundMessages;
    }
Returns the {@link Queue} which holds all the {@link Object}s that were written by this {@link Channel}.
plc4j/transports/test/src/main/java/io/netty/channel/embedded/Plc4xEmbeddedChannel.java