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umqtt.robust: let reconnect() call the connect() method of the top class by ian-llewellyn · Pull Request #669 · micropython/micropython-lib · GitHub

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umqtt.robust: let reconnect() call the connect() method of the top class - #669

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dpgeorge merged 1 commit into
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Jul 1, 2026
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umqtt.robust: let reconnect() call the connect() method of the top class#669
dpgeorge merged 1 commit into
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ian-llewellyn:umqtt.robust.connect

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ian-llewellyn commented May 25, 2023 •
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This allows overriding of the connect() method by a subclass as per the included examples: example_lwt_robust.py and example_resubscribe_robust.py.

Fixes #186, #321 (by enabling example_resubscribe_robust.py)
Supersedes PR #195 (original source file moved, examples added)

ian-llewellyn commented May 25, 2023

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@andrewleech, if you had a moment to review + comment, I'd appreciate it.

andrewleech commented May 25, 2023

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Those examples look great!

ian-llewellyn commented May 30, 2023

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Anything else I ought to do / address before this can go forward for merge?

ian-llewellyn force-pushed the umqtt.robust.connect branch from 8d4503b to 1d1f6ac Compare June 6, 2023 16:15

ian-llewellyn commented Jun 14, 2023

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Hey guys, any chance we can progress this to merge? If there's anything else to do beforehand, let me know.

ian-llewellyn commented Jun 22, 2023

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@andrewleech, @dpgeorge, you guys seem like the people to be pestered! 🤣 (sorry). Are there reasons this PR shouldn't progress? If there's anything more I should do, please do tell.

andrewleech mentioned this pull request Aug 12, 2023
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ian-llewellyn commented Nov 22, 2023

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Just polling to see if this can go ahead.

ian-llewellyn commented May 1, 2026

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This change allows reconnect() to respect subclass overrides of connect(), which aligns with normal Python polymorphism and enables common extension patterns (e.g. setting LWT state or re-subscribing after reconnect as per examples).

Currently, using super().connect() bypasses such overrides, meaning subclasses cannot reliably customise connection behaviour during reconnects.

This PR does assume that connect() will never call reconnect(). If that contract is expected, this seems like the more extensible approach; if not, the current implementation is safer but restricts subclass behaviour.

Happy to leave as-is if the intention is to keep reconnect() tied strictly to the base implementation. Would love to close this PR if that is the case.

dpgeorge approved these changes Jul 1, 2026
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Sorry this PR got neglected. In the meantime I merged #195 (which actually rebased cleanly). This PR is still useful because it adds a comment and some very helpful examples.

umqtt.robust: Document and add examples overriding the connect() method.
3b51e30 
Follow up to commit 5dad29e.

Add a comment on how to override the `connect()` method by a subclass, and
provide examples: `example_lwt_robust.py` and
`example_resubscribe_robust.py`.

Co-authored by: Ian Cotter-Llewellyn <ian_llewellyn@hotmail.com>
Date: Thu May 25 11:42:20 2023 +0100
dpgeorge force-pushed the umqtt.robust.connect branch from 1d1f6ac to 3b51e30 Compare July 1, 2026 05:13
dpgeorge merged commit 3b51e30 into micropython:master Jul 1, 2026
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dpgeorge commented Jul 1, 2026

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This is now rebased and merged.

Thanks @ian-llewellyn for persisting with this for so long 👍

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