philipparndt/mqtt-analyzer

Topic starts with a /

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harmi86 commented

Hi,

While testing the App, I had trouble to publish messages to a topic. I use the mosquito broker on my raspberry pi 4. Here I subscribed the topic „/test/topic“ and when I publish a message on the raspberry it was correctly shown in the app. Then I tried to publish a message in the app to the same topic but it was never shown on the raspberry. I tried to subscribe the topic „test/topic“ and then the messages were shown.

I use the version 2.6.0 but had the same issue in the official version.

philipparndt commented

Thanks for letting me know. This is an issue in the topic tree.
When publishing the topic: /test the topic test is published.

According to the HiveMQ best practices you should not use a leading / as it is an empty topic. However, it should be supported and I will fix it 😉

philipparndt commented

@harmi86 I've uploaded a new Version (2.6.0 b129) to TestFlight. Do you like to test this?

harmi86 commented

I tested it and it is working now. Thanks a lot

maybe I should read the best practice 😂

  • 👍1
philipparndt commented

Thanks for testing 👍

In my opinion, the leading slash meaning in MQTT is confusion.
I guess the intention when using it is almost every time to have the topic at the root like you would have it in a file system.