Understand link-layer and driver diagnostic boundaries

Chapter overview

Bottom line: Draw only a handover checklist. Each checkpoint represents a documentation category, not a local observation or KNX bus result.

Purpose

Use handover checkpoints to separate the evidence layers of programs, drivers, interfaces, and buses.

Prepare

Chapter 9's offline responsibility map with a blank classification sheet; no hardware or logs required.

Time

About 20 minutes

System change

Do not modify Home Assistant; only use pinned sources to establish offline link layer and driver diagnostic models.

Expected result

Distinguish process, driver, interface, and bus evidence without treating startup messages as bus results.

Stop conditions

• The task requires diagnostic mode, hardware access, or a service restart.
• Telegram transmission and physical control are prohibited as driver-verification methods.

Scope and safety boundaries

This chapter only organizes the responsibilities in pinned documents. Do not enable diagnostic mode, do not read local logs, do not access hardware, and do not restart services. The states on the table are category names, not local observations.

This chapter does not add the repository, install or start it. This site lacks approved immutable artifact/image digest and source-to-build proof, so all execution is blocked.

Do not connect to the interface or bus. Group reading is prohibited. Group writing is prohibited. Telegram transmission is prohibited. ETS programming or downloads is prohibited. Physical control is prohibited. No program or driver class can certify bus, integration, or device performance.

Core concepts

You can use three paper labels: "Document can be compared", "Document describes failure boundary" and "Insufficient evidence". These words only classify source content. They are not observing start, stop, retry, or hardware reactions.

Preparation and prerequisites

Draw four handover boxes: program, driver, interface, bus. Each box is further divided into two columns: "Pinned Document Description" and "Still Unable to Infer".

• Sources only use locked versions of pinned INI files.
• Use only category labels; do not write "observed on this system" or "occurred on site."
• Do not include paths, endpoints, addresses, hardware names, serial numbers, or log fragments.
• The bus column always remains "No evidence of this chapter".

If data comes from an execution environment, do not put it in this table. Handle it separately under the safe log-sharing guidance; do not rewrite it as a source claim for this chapter.

Steps

1. Draw four stations first. Write the program, driver, interface and bus in order. Write only the name of the responsibility.
2. Classify file relationships. Put each responsibility cited by the pinned source in the document-supported column. Do not claim that settings have been loaded.
3. Classify activation semantics. Place pinned source descriptions of driver settings and failures in the documented-boundary column. Do not write that the system has started or failed.
4. Block interface inference. Noting the driver family name does not prove that the interface exists, is compatible, or is available.
5. Block bus inferences. Note that neither the program nor the driver class can prove telegram, group operations, or bus results.
6. Complete the handover form. The conclusion simply states "Source classification has been completed" or "Insufficient evidence". Do not include local diagnostic conclusions.

Verification and evidence

The finished product is a document-classification table. It divides responsibility among checkpoints and separates supported claims from unsupported ones.

• I divided the process, driver, interface, and bus into four checkpoints.
• My diagnostic statuses are all source classifications, not local observations.
• I put no logs, devices, addresses, paths, endpoints, serial numbers, or live values.
• I did not upgrade the startup or failure semantics to driver, hardware, interface, bus or integration results.

Next step: Go to Chapter 11, use only classification to create an ETS offline preflight table.

Troubleshooting

• Write file semantics into local events: Change back to "Pinned File Description". Remove time, host and observations.
• The driver names seem to match: Only file family categories are retained. Don't claim hardware compatibility.
• Someone provided a forward log: Don't put it in the table. Forward messages also cannot prove the next handover point.
• Someone provides an error log: Don't determine the root cause. It will be handled separately according to the security log process.
• Someone asked for restart confirmation: Stop. This chapter performs offline classification only.
• Someone asked to use the bus to verify: Stop. Verification using telegram, group operations or physical control is prohibited.

FAQ