webui: warn when no interface is available for teaching in devices

[jens-maus]

Original OpenCCU rootfs patch: 0137
Original filename: 0137-WebUI-Add-NoInterfaceWarning.patch
Original patch: https://github.com/OpenCCU/OpenCCU/blob/3f0a5e619/buildroot-external/package/openccu-base/rootfs-patches/0137-WebUI-Add-NoInterfaceWarning.patch
Original changes: OpenCCU/OpenCCU@6f8b1043c (teach-in warning) and OpenCCU/OpenCCU@eddd557d7 (blind firmware check without an interface)

The teach-in dialog ("Teach-in devices") only shows the sections of the interfaces that are present (BidCos-RF, BidCos-Wired, HmIP-RF, HmIP-Wired). If no radio module or LAN gateway is usable, all sections stay hidden and the dialog is empty, without any hint why.

This applies the patch 1:1:

• src/webui/www/config/cp_add_device.cgi: a new first table row sectionUNAVAIL with a warning (dialogNewDevicesUNAVAILWarn). It is visible by default, and showSection() hides it as soon as one of the interface sections is shown (both for the cached and for the Interface.isPresent path).
• src/webui/www/webui/js/lang/{de,en}/translate.lang.js: the dialogNewDevicesUNAVAILWarn text.
• src/webui/www_source/webui/js/model/channel.js (part of webui.js): the firmware check of the HmIP blind actuators (HmIPW-DRBL4, HmIP-DRBLI4, HmIP-BBL, HmIP-FBL, ...) skips the firmware evaluation when Interface.getDeviceDescription returns nothing, and only uses fwGTE16 when it is defined. Without an HmIP-RF interface, the channel setup failed with a TypeError on devDescr.firmware (or a ReferenceError on fwGTE16). The channel then falls back to the existing path for firmware < 1.6 (default channel type BLIND).

webui.js is assembled from www_source, so the webui.js hunk of the rootfs patch is applied to channel.js. Encodings and line endings are preserved (cp_add_device.cgi ASCII/CRLF, channel.js ISO-8859-1, translations ASCII). The root www/ copies are unused legacy files and are left unchanged.

Other OpenCCU rootfs patches also modify these files (0039 for cp_add_device.cgi, many patches for webui.js and the translations). None of them touches the changed lines or their context, and they still apply with zero fuzz.

Validation

• OpenCCU scripts/base-patch-migration.py validate with the canonical Buildroot 2026.08 git4 archive of this branch (df9b79d5, sha256 63000298d559e3c02cde40b20dea4b6b0f344b9916714237beb081c914bea947) and --skip-patch 0137: PASS (the other 67 rootfs patches apply with zero fuzz).
• compare against the current pin baseline (68bc1f27, all 68 patches as of bump openccu-base to 3.89.11-110-g68bc1f2 OpenCCU#4392): IDENTICAL (4668 entries).

OpenCCU cleanup PR (removing patch 0137 and updating the pin): OpenCCU/OpenCCU#4395

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Generated by Claude Code

Summary by CodeRabbit

• New Features
  • Device setup now displays a warning when no compatible Homematic radio module or LAN gateway is available, with guidance to check its connection or configuration.
• Bug Fixes
  • Improved blind-channel handling when device information is unavailable, avoiding firmware-dependent mode handling based on missing details.

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Generated by Claude Code

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📝 Walkthrough

Walkthrough

The device setup page now displays an unavailable-interface warning and hides it when an interface is present. Blind-channel firmware handling now checks for a device description before accessing its firmware data.

Changes

Device setup availability warning

Layer / File(s)	Summary
Render and control the unavailable-interface warning src/webui/www/config/cp_add_device.cgi, src/webui/www/webui/js/lang/*/translate.lang.js	The setup page adds a warning row and hides it when an interface is present. English and German translation catalogs add warning text about missing compatible hardware.

Blind-channel firmware handling

Layer / File(s)	Summary
Guard firmware handling by device description src/webui/www_source/webui/js/model/channel.js	Firmware extraction and cleanup now run only when devDescr exists. The firmware-at-least-1.6 path also checks that fwGTE16 is defined.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Merge Risk: 🟡 Moderate · up to df9b7

When a device description is unavailable, blind-channel setup can save the wrong channel mode. Guard both firmware branches before merging.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the primary change: warning users when no interface is available for teaching in devices.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 3…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @src/webui/www_source/webui/js/model/channel.js:
- Line 94: In the channel-mode handling around `fwGTE16`, clear the prior
firmware state when starting a new `Interface.getDeviceDescription` lookup, and
run neither firmware branch unless that lookup produced a valid firmware result.
This prevents a missing description from selecting the below-1.6 branch or
reusing another device’s firmware state.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 167ddf22-fac8-4fb1-a14c-3b0df4c52525

📥 Commits

Reviewing files that changed from the base of the PR and between 68bc1f2 and df9b79d.

📒 Files selected for processing (4)

• src/webui/www/config/cp_add_device.cgi
• src/webui/www/webui/js/lang/de/translate.lang.js
• src/webui/www/webui/js/lang/en/translate.lang.js
• src/webui/www_source/webui/js/model/channel.js

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