@kluszczyn - I was doing that last night and it wasn't working. However, it has started to work this morning. I have no idea why it wasn't doing it last night (Probably user error, admittedly). I have the issue sorted this morning. Will update the title of this thread now. MODs are welcome to remove the post if needed.
I personally use MQTT.fx to monitor my MQTT channels, just in case you ever needed to change for some reason or would like to check out the if it has any features you require.