![]() ![]() That all message passed to publish() has a corresponding on_publish() call. This means that message passed to publish() may be lost. QoS 1 and QoS 2 messages which have been sent to the Server, but have not been completely acknowledged. Won’t hang but will lost this QoS 2 message. Since the client will blindly acknowledge any PUBCOMP (last message of a QoS 2 transaction), it QoS 2 messages which have been received from the Server, but have not been completely acknowledged. The following part of client session is lost: Program was restarted) the session is lost. ![]() When client is restarted (not just reconnected, the object is recreated usually because the When clean_session is False, the session is only stored in memory not persisted. The following are the known unimplemented MQTT feature. To perform all test (including MQTT v5 test), you also need to clone in folder: git clone Known limitations Once you have the code, it can be installed from your repository as well: cd To obtain the full code, including examples and tests, you can clone the git repository: git clone The latest stable version is available in the Python Package Index (PyPi) and can be installed using pip install paho-mqtt Designed as an extremely lightweight publish/subscribe messaging transport, it is useful for connections with remote locations where a small code footprint is required and/or network bandwidth is at a premium. The MQTT protocol is a machine-to-machine (M2M)/”Internet of Things” connectivity protocol. It also provides some helper functions to make publishing one off messages to an MQTT server very straightforward. This code provides a client class which enable applications to connect to an MQTT broker to publish messages, and to subscribe to topics and receive published messages. This document describes the source code for the Eclipse Paho MQTT Python client library, which implements versions 5.0, 3.1.1, and 3.1 of the MQTT protocol.
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