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PTP: drop the "Preferred TimeTransmitter" role

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It behaved exactly like auto (clock class 248); the only difference was a
priority1 suggestion in the page. Roles are now slave|auto; to prefer this
device, use auto with a low priority1. A stored "master" is converted to
auto at boot (new cfg_set_string, like cfg_set_number).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Ben Nicholson
2026-09-26 07:58:26 +10:00
parent ee03d9f9f1
commit 5f27262b27
7 changed files with 61 additions and 13 deletions
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docs/user-guide.md
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@@ -123,7 +123,7 @@ The board locks its media clock to the PTP grandmaster on the network (IEEE 1588
| Setting | Default | Notes |
|---|---|---|
| Mode | multicast | **hybrid** sends the delay requests unicast (fewer multicast packets). |
| Role | Auto | **TimeReceiver only**: never becomes grandmaster. **Auto**: becomes grandmaster only if there is none (fallback). **Preferred TimeTransmitter**: tries to be grandmaster. |
| Role | Auto | **TimeReceiver only**: never becomes grandmaster. **Auto**: becomes grandmaster only if there is none (fallback). To make this board the preferred grandmaster, keep *Auto* and set a low *Priority 1* (e.g. 100). |
| Domain | 0 | Must match your grandmaster. |
| Priority 1 / 2 | 250 / 250 | Lower wins the grandmaster election. |
| Intervals, timeout, DSCP (46) | | Presets below set them. |