The basic operations of the mqtt protocol is fine.
However, sometimes when the broker send messages to the FX30, FX30 cannot subscribe to messages.
After that, when FX30 has publishing, that messages that have not been received are displayed as if they have subscribed at once.
It seems that subscribed contents that were not visible before the publish operation in FX30.
in my opinien, FX30 had received messages well, but display was failed. After that… when operation of publish, that all messages are displayed.
This doesn’t always happen, but it does happen quite often.