The MQTT broker URL used as default in the examples has ceased operation. All examples and documention have been updated to point to the new domain mqtt.eclipse.org. This also required an update of the python example test scripts to use TLS 1.2
testing conditions: transports (tcp, ssl, ws..) qos (0, 1, 2) short repeated messages (packed packets) oversized messages (fragmented packets) publish from a different thread Closes https://github.com/espressif/esp-idf/issues/2870 by means of including commit 815623dfe5 from esp-mqtt Closes https://github.com/espressif/esp-idf/issues/2975 by means of including commit 752953dc3b from esp-mqtt Closes https://github.com/espressif/esp-idf/issues/2850 by means of including commits df455d2a5f 17fd713bce from esp-mqtt
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