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GeezerVison is showing github.com — Keep hub children when the child component list is missing by Richardtristan · Pull Request #1797 · python-kasa/python-kasa

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@Richardtristan

@Richardtristan Richardtristan commented Oct 12, 2026

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Fixes #1796

Problem

Some hubs intermittently return a getChildDeviceComponentList result without the child_component_list key. I hit this on an H200 with no child device paired (firmware 1.7.7 Build 20260917). Every update then failed in _create_delete_children() with KeyError: 'child_component_list', and all of the hub's entities became unavailable in Home Assistant.

The response is most likely an empty dict. A result without start_index/sum skips _handle_response_lists() and reaches _create_delete_children() unchanged.

Change

When the list is missing, children are neither created nor deleted for that update, and a debug message is logged. Treating the response as an empty list would delete the known children of a hub that has some, so they are kept until the next complete response.

Tests

test_dynamic_devices now also covers a component list response without the list:

  • on a hub with children, the children are kept;
  • on a hub without children, the update no longer raises and there are still no children.

Ran locally on tests/smart, tests/smartcam, tests/test_childdevice.py and tests/protocols: 4491 passed, 175 skipped. ruff check, ruff format --check and mypy pass on the changed files.

A one-line .get("child_component_list", []) version of this fix has been running on my H200 since the issue was opened, with no more errors.

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@Richardtristan
Keep hub children when the child component list is missing
344b431
Some hubs intermittently return a getChildDeviceComponentList result
without the child_component_list key. Seen on an H200 without any child
device paired (firmware 1.7.7 Build 20260917): every update then failed
with KeyError: 'child_component_list' in _create_delete_children and all
of the hub entities became unavailable.

Skip creating and deleting children for that update instead of failing.
Treating the response as an empty list would delete the known children
of a hub that has some, so they are kept until the next complete
response.
@codecov

codecov Bot commented Oct 12, 2026 •
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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.41%. Comparing base (38a3184) to head (344b431).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files
@@           Coverage Diff           @@
##           master    #1797   +/-   ##
=======================================
  Coverage   93.41%   93.41%           
=======================================
  Files         159      159           
  Lines       10113    10116    +3     
  Branches     1043     1044    +1     
=======================================
+ Hits         9447     9450    +3     
  Misses        472      472           
  Partials      194      194           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:
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@rytilahti rytilahti added the bug Something isn't working label Oct 12, 2026
rytilahti
rytilahti approved these changes Oct 24, 2026
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@rytilahti rytilahti left a comment

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Thank you @Richardtristan, let's get this in for the next release!

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@rytilahti
rytilahti merged commit 78146d4 into python-kasa:master Oct 24, 2026
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@rytilahti rytilahti mentioned this pull request Oct 25, 2026
Prepare 0.12.0 #1811
Merged
rytilahti added a commit that referenced this pull request Oct 25, 2026
@rytilahti
Prepare 0.12.0 (#1811)
a178fba
## [0.12.0](https://github.com/python-kasa/python-kasa/tree/0.12.0)
(2026-10-25)

This release include several compatibility fixes (updated accepted SSL
ciphers, removal of Homekit from the default update cycle).
The new API `Device.supports_module()` provide a way to find out if the
device supports some specific module, e.g., HomeKit, without including
it in the default update cycle.

[Full
Changelog](0.11.0.1...0.12.0)

**Fixed bugs:**

- Keep hub children when the child component list is missing
[\#1797](#1797)
(@Richardtristan)
- Strip multi-word rich tags when rich is not installed
[\#1807](#1807)
(@wolfgang-aura)
- Add Device.supports_module() and stop querying HomeKit for iot devices
[\#1808](#1808)
(@rytilahti)
- Keep multi requests for smartcam devices after a timeout
[\#1802](#1802)
(@hugaraujo)
- Consolidate SSL ciphers and use them in SslTransport
[\#1798](#1798)
(@rytilahti)
- Raise UnsupportedDeviceError instead of crashing on unknown device
types [\#1781](#1781)
(@GhostCoder6969)

**Added support for devices:**

- Add TD21(EU) device fixture
[\#1786](#1786)
(@Smugaski)
- Add P116M(IN) fixture
[\#1795](#1795)
(@Partha-dev01)

**Project maintenance:**

- Add Python 3.15 to supported versions and update pins
[\#1793](#1793)
(@rytilahti)
- Generate the changelog with git-cliff and draft releases in CI
[\#1809](#1809)
(@rytilahti)
- Build and check packages in CI and publish workflows
[\#1782](#1782)
(@rytilahti)

**Other changes:**

- Use the real discovery reply in the TD21 fixture
[\#1800](#1800)
(@Smugaski)
@rytilahti rytilahti mentioned this pull request Oct 25, 2026
Bump python-kasa to 0.12.0 home-assistant/core#188594
Merged
2 of 21 tasks
pillarsdotnet pushed a commit to pillarsdotnet/python-kasa that referenced this pull request Oct 30, 2026
@Richardtristan
Keep hub children when the child component list is missing (python-ka…
87aa12e
…sa#1797)

Fixes python-kasa#1796

Some hubs intermittently return a `getChildDeviceComponentList` result
without the `child_component_list` key, as seen with an H200 (firmware 1.7.7 Build 20260917).

This changes the logic, so that when the list is missing, children are neither created nor deleted for
that update, and a debug message is logged. Treating the response as an
empty list would delete the known children of a hub that has some, so
they are kept until the next complete response.
pillarsdotnet pushed a commit to pillarsdotnet/python-kasa that referenced this pull request Oct 30, 2026
@rytilahti
Prepare 0.12.0 (python-kasa#1811)
7ddf1ef
## [0.12.0](https://github.com/python-kasa/python-kasa/tree/0.12.0)
(2026-10-25)

This release include several compatibility fixes (updated accepted SSL
ciphers, removal of Homekit from the default update cycle).
The new API `Device.supports_module()` provide a way to find out if the
device supports some specific module, e.g., HomeKit, without including
it in the default update cycle.

[Full
Changelog](python-kasa/python-kasa@0.11.0.1...0.12.0)

**Fixed bugs:**

- Keep hub children when the child component list is missing
[\python-kasa#1797](python-kasa#1797)
(@Richardtristan)
- Strip multi-word rich tags when rich is not installed
[\python-kasa#1807](python-kasa#1807)
(@wolfgang-aura)
- Add Device.supports_module() and stop querying HomeKit for iot devices
[\python-kasa#1808](python-kasa#1808)
(@rytilahti)
- Keep multi requests for smartcam devices after a timeout
[\python-kasa#1802](python-kasa#1802)
(@hugaraujo)
- Consolidate SSL ciphers and use them in SslTransport
[\python-kasa#1798](python-kasa#1798)
(@rytilahti)
- Raise UnsupportedDeviceError instead of crashing on unknown device
types [\python-kasa#1781](python-kasa#1781)
(@GhostCoder6969)

**Added support for devices:**

- Add TD21(EU) device fixture
[\python-kasa#1786](python-kasa#1786)
(@Smugaski)
- Add P116M(IN) fixture
[\python-kasa#1795](python-kasa#1795)
(@Partha-dev01)

**Project maintenance:**

- Add Python 3.15 to supported versions and update pins
[\python-kasa#1793](python-kasa#1793)
(@rytilahti)
- Generate the changelog with git-cliff and draft releases in CI
[\python-kasa#1809](python-kasa#1809)
(@rytilahti)
- Build and check packages in CI and publish workflows
[\python-kasa#1782](python-kasa#1782)
(@rytilahti)

**Other changes:**

- Use the real discovery reply in the TD21 fixture
[\python-kasa#1800](python-kasa#1800)
(@Smugaski)
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H200 hub without child devices: KeyError 'child_component_list' in _create_delete_children (0.11.0.1)

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@Richardtristan @rytilahti
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