auto: docs sync 2026-07-01T18:00:05+00:00
Files changed: engine/lint-report.md vault/.obsidian/workspace.json vault/runbooks/pymc-repeater-kiss-tnc-reenumeration.md
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# Vault Lint Report
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Generated: 2026-07-01T06:00:06Z | Docs scanned: 98 | Elapsed: 0.0s
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Generated: 2026-07-01T12:00:06Z | Docs scanned: 98 | Elapsed: 0.0s
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## Summary
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4
vault/.obsidian/workspace.json
vendored
4
vault/.obsidian/workspace.json
vendored
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},
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"active": "17bd4a6166f789d0",
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"lastOpenFiles": [
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"runbooks/pymc-repeater-kiss-tnc-reenumeration.md",
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"runbooks/pymc-repeater-kiss-tnc-reenumeration.md.tmp.5281.e47d0cbf9c9a",
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"runbooks/headscale-oidc-boot-order.md",
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"runbooks/headscale-oidc-boot-order.md.tmp.246153.e2a5642e10dd",
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"runbooks/headscale-onboard-node.md.tmp.246153.9adf70459e77",
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"runbooks/ia-cli-reference.md.tmp.3603785.daa56d288051",
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"runbooks/pipeline-patterns.md.tmp.3603785.ea95256eaac1",
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"runbooks/headless-browser-page-verification.md.tmp.3603785.4eb1d115aefe",
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"runbooks/headless-browser-page-verification.md.tmp.3603785.f017d6928577",
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"runbooks/headless-browser-page-verification.md",
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"runbooks/central-deploy-cutover.md",
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"runbooks/fleet-magicdns-resolved-migration.md",
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"concepts/ocr.md",
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"archive/projects/mmud/mmud-prompts/mmud-prompts/01-update-planned.md",
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"INDEX.md",
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"glossary.md",
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"assets/echo6yellow_logo_422x422_square.png",
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"assets/echo6yellow_logo_422x81.png",
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"assets/echo6_logo.png",
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187
vault/runbooks/pymc-repeater-kiss-tnc-reenumeration.md
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187
vault/runbooks/pymc-repeater-kiss-tnc-reenumeration.md
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---
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title: pymc-repeater KISS TNC Re-enumeration Fix
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type: runbook
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tags:
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- mesh
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related:
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- [[meshtastic-sidecar-node]]
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updated: 2026-07-01
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---
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# pymc-repeater KISS TNC Re-enumeration Fix
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`pymc-repeater.service` on **aida-nebra** (Tailscale 100.64.0.9) runs the Meshcore LoRa repeater node `EchoBase` on 910.525 MHz SF7. It talks to a RAK4631 USB KISS TNC (VID 239a / PID 8029) via the `/dev/pymc-radio` udev symlink. The Nebra SX1262 hat on the same machine runs a separate `meshtasticd` instance on its own radio — see [[meshtastic-sidecar-node]] for that hardware's setup. Do not touch `meshtasticd` or the SX1262 hat during any pymc-repeater work.
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---
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## Background — Why This Breaks
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`KissModemWrapper` holds the serial file descriptor open but has no reopen logic. When the RAK4631 re-enumerates (power cycle, USB glitch, kernel rescan), the kernel assigns a new node: observed `ttyACM0` → `ttyACM1` around 2026-06-23. The service keeps a stale fd pointing at `/dev/ttyACMx (deleted)`. Systemd still reports `active (running)` — the service is silently deaf and mute.
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---
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## Symptom
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Every ~30 seconds in the journal:
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```
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KissModemWrapper - ERROR - Serial write error: ... [Errno 5] Input/output error
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TX frame write failed, dropping frame
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```
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Zero RF traffic in or out despite a green `systemctl status`.
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---
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## Diagnose
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### 1. Check the journal for the I/O error spam
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```bash
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ssh zvx@100.64.0.9
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journalctl -u pymc-repeater.service --since '5 min ago' --no-pager
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```
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Look for `[Errno 5] Input/output error` or `TX frame write failed` — either confirms stale fd.
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### 2. Inspect the process's open file descriptors
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```bash
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sudo ls -l /proc/$(systemctl show -p MainPID --value pymc-repeater.service)/fd/ | grep ttyACM
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```
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- **Stale (broken):** symlink target contains `(deleted)` — smoking gun.
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- **Healthy:** target points at a real `/dev/ttyACMx`.
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### 3. Confirm where the device landed after re-enumeration
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```bash
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ls -l /dev/pymc-radio
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```
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Shows which `ttyACM*` the live RAK4631 is on now.
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---
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## Manual Recovery
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A restart clears the stale fd and re-opens the device via the udev symlink:
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```bash
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sudo systemctl restart pymc-repeater.service
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```
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### Verify recovery
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```bash
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# fd should now point at a real ttyACMx (not deleted)
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sudo ls -l /proc/$(systemctl show -p MainPID --value pymc-repeater.service)/fd/ | grep ttyACM
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# Journal should show reconnect and normal TX
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journalctl -u pymc-repeater.service -n 20 --no-pager
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```
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Expected healthy journal lines:
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```
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KISS modem connected to /dev/pymc-radio at 115200 baud
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Retransmitted packet ...
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```
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The `[Errno 5]` spam must be absent.
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---
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## Permanent Fix (applied 2026-07-01)
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Two changes make pymc-repeater self-healing across any future re-enumeration. Original files were backed up as `.bak` alongside each.
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### 1. udev rule — `/etc/udev/rules.d/99-pymc-radio.rules`
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Added `TAG+="systemd"` and `ENV{SYSTEMD_WANTS}="pymc-repeater.service"` to the existing VID 239a / PID 8029 rule:
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```udev
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SUBSYSTEM=="tty", ATTRS{idVendor}=="239a", ATTRS{idProduct}=="8029", \
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SYMLINK+="pymc-radio", \
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TAG+="systemd", \
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ENV{SYSTEMD_WANTS}="pymc-repeater.service"
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```
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On any future re-enumeration, udev creates the `dev-pymc\x2dradio.device` unit for the new node and systemd activates `pymc-repeater.service` against it automatically.
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### 2. systemd unit — `/etc/systemd/system/pymc-repeater.service`
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`[Unit]` additions:
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```ini
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BindsTo=dev-pymc\x2dradio.device
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After=dev-pymc\x2dradio.device
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StartLimitIntervalSec=300
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StartLimitBurst=10
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```
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`[Service]` additions:
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```ini
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Restart=always
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RestartSec=5
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```
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`BindsTo` stops the service cleanly when the TNC drops (the device unit disappears) and restarts it when the device returns. `Restart=always` with `RestartSec=5` ensures fast recovery from any modem crash without the device unit cycling.
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---
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## Verify the Resilience Wiring Is Intact
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Run these on aida-nebra after any future maintenance to confirm the permanent fix is still in place:
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```bash
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# BindsTo and After wired to the device unit
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systemctl show pymc-repeater.service -p BindsTo -p After | grep -i pymc
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# udev tagging correct
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udevadm info -q property -n /dev/pymc-radio | grep -i SYSTEMD
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# device unit tracked by systemd
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systemctl list-units --type=device --all | grep -i pymc
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```
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Expected output:
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```
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BindsTo=dev-pymc\x2dradio.device
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After=... dev-pymc\x2dradio.device ...
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SYSTEMD_WANTS=pymc-repeater.service
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dev-pymc\x2dradio.device loaded active plugged ...
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```
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---
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## Known Secondary Issue (non-blocking)
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RRD graphing fails with `rrdtool not available`. Metrics/graphing only — no impact on RF operation.
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---
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## Quick Reference
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| Item | Value |
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|------|-------|
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| Host | aida-nebra (100.64.0.9) |
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| Service | `pymc-repeater.service` |
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| Node / freq | EchoBase, 910.525 MHz SF7 |
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| TNC hardware | RAK4631 USB KISS TNC (VID 239a / PID 8029) |
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| udev symlink | `/dev/pymc-radio` |
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| udev rule | `/etc/udev/rules.d/99-pymc-radio.rules` |
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| Unit file | `/etc/systemd/system/pymc-repeater.service` |
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| Unrelated radio | Nebra SX1262 hat → `meshtasticd` (do not touch) |
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```bash
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# Restart (manual recovery)
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sudo systemctl restart pymc-repeater.service
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# Tail journal
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journalctl -u pymc-repeater.service -f
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# Check fd state
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sudo ls -l /proc/$(systemctl show -p MainPID --value pymc-repeater.service)/fd/ | grep ttyACM
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```
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