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docs: clarify port 1010 bind on Docker for shellypro3em_old #368

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tomquist merged 2 commits into from
May 16, 2026
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docs: clarify port 1010 bind on Docker for shellypro3em_old #368

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docs: clarify port 1010 bind on Docker for shellypro3em_old
claude May 16, 2026
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docs: note that combined shellypro3em is also affected by 1010 bind
claude May 16, 2026
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2 changes: 2 additions & 0 deletions README.md
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Expand Up @@ -1012,6 +1012,8 @@ A: Ports below 1024 require root privileges on Linux. Solutions:
- Use `setcap` to grant permissions
- Run as root (not recommended)

Note: the Docker image runs as a non-root user, so binding port 1010 (used by `shellypro3em_old` and the combined `shellypro3em`, which starts both listeners) still fails with `PermissionError: [Errno 13]` under `network_mode: host`. Port 2220 (`shellypro3em_new`) is unaffected. Either lower the host's privileged-port range (`sudo sysctl -w net.ipv4.ip_unprivileged_port_start=1010`, persist via `/etc/sysctl.d/`) or run the container as root (`user: "0:0"` in compose). Publishing the port via bridge networking does **not** work, because the Marstek discovery packets are UDP broadcasts to the subnet address and aren't forwarded by Docker's port mapping.

### I get parsing errors on startup or the app crashes.

A: Common causes:
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