branch idf3: 2nd esp_mqtt_publish(QOS1) always fails about esp-mqtt HOT 5 CLOSED

What broker are you using?

I tested the included example in this repository successfully with shiftr.io and mosquitto in all QoS modes.

BTW: Since you use the master branch of esp-idf: I just published a "idf3" branch with the necessary changes to work with esp-idf v3.

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Thanks for the follow-up.
I have re-tested it with the "idf3" branch of esp_mqtt towards your broker.shiftr.io mqtt server, and against a local Mosquitto mqqt server. The problem remains the same.

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@pantaluna @vortex314 I found the issue. There was an issue with the background process task interfering with the publish method. This caused them to do work the other task was supposed to do and thus yield an error. Somehow, this only triggered if messages are published from app_main or a task with priority 1 (the lowest possible). Anyway, I tested @pantaluna's code with the fix and the issue should be resolved now. This should also fix some potential delays when using QoS > 0.

I released a new version for IDF 2.1.1. and rebased the idf3 branch. Please test your code again and give me some feedback if this has been resolved fully. 🚀

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It works. Thanks!

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Awesome!

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