回答編集履歴
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参考リンクと引用
test
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`on_disconnect` の引数は `client, userdata, rc` の3つです。`flag` はありません。
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[Callbacks](https://pypi.org/project/paho-mqtt/#callbacks) より
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```
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on_disconnect(client, userdata, rc)
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Called when the client disconnects from the broker.
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client
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the client instance for this callback
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userdata
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the private user data as set in Client() or user_data_set()
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rc
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the disconnection result
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```
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