---
title: Project CPE Glossary
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---

## Glossary

| Term | Definition |
|------|------------|
| **OTA** | Over‑The‑Air update package containing the backend binary, the compiled front‑end `www/` assets and the FRPC client. Packaged as `udx710-ota-{VERSION}.tar.gz` with a `meta.json` manifest (version, commit, checksums, architecture). |
| **FRPC** | Fast Reverse Proxy client (v0.70.1) bundled with the OTA. Used to expose services from the device to a remote server. Managed by `backend/src/state.rs` (install, config render, start/stop, log rotation). |
| **DBus / ofono** | Linux D‑Bus interface to the modem stack, provided by the `ofono` daemon. The project communicates via the `zbus` crate, wrapping interfaces such as `MessageManager`, `VoiceCallManager`, etc. |
| **Serial AT lock** | Global mutex (`DBUS_LOCK`) that serialises all AT commands and DBus calls to avoid `org.ofono.Error.InProgress`. Implemented in `backend/src/serial.rs` and used via `with_serial`. |
| **USB Gadget Hot‑Switch** | Runtime re‑configuration of the USB‑OTG gadget (NCM, ECM, RNDIS) using configfs. Implemented in `backend/src/usb_switch.rs`. Persistent mode stored in `/mnt/data/mode.cfg`. |
| **Band‑mask** | Bit‑mask representation of LTE/NR carrier bands. Mapping is hardware‑specific (Rockchip/Unisoc) and handled by utility functions in `backend/src/utils.rs`. |
| **Vite** | Front‑end build tool (v7) used to compile the React 19 source into a static `dist/` directory. |
| **MUI** | Material‑UI React component library (v7) providing theming and UI widgets. |
| **TanStack Query** | Data‑fetching library (`@tanstack/react-query` v5) used for API calls with caching and background refetch. |
| **Vaultwarden** | Self‑hosted Bitwarden compatible password manager; the sole source of stored secrets for this project. |
| **UPX** | Optional executable compressor used in the CI pipeline to shrink the backend binary size. |
| **CORS** | Cross‑Origin Resource Sharing configuration; currently set to allow any origin (`*`). |
| **CI pipeline** | GitHub Actions workflow (`.github/workflows/build-ota.yml`) that builds backend and frontend, optionally compresses binaries, creates OTA tarball, verifies checksums, and uploads artifacts. |
| **Refresh interval** | UI polling frequency controlled via `RefreshContext`; default 5 s, adjustable through the Top‑Bar menu. |
| **InitScript** | Device initialization shell script (`init.sh`) editable via the UI; static analysis warns about syntax issues and potentially dangerous commands. |

All definitions are extracted directly from the evidence (see source IDs in the surrounding documents).