MQTT publish with Mosquitto

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Hi i just checked out the MQTT client from the App-Store and build a small app to check the connectivity. i am able to subscribe to a topic but not to publish a message to the topic. i works on the command line of  my laptop but not in the app. Here the screen shut for publish a message
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1 answers
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no , ;-(  i switched on tracing but no message on publish, but i do get a message if i subscribe to a topic

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