Stage 6e — Simultaneous Network Transports

Why this stage exists

A single PrimaryConnection cannot describe a phone with registered SIM service and wifi at the same time. VPN and loopback connections also must not masquerade as physical signal indicators. This stage changes the optional network adapter to report transport capabilities independently.

Snapshot and service boundaries

NetworkSnapshot is now a struct with wifi: Option<u8>, cellular: Option<u8>, and wired: bool. NetworkManager supplies active wifi and ethernet state; the wifi device’s active access point supplies signal strength. ModemManager’s standard ObjectManager discovers modem objects, and a modem at least in the registered state supplies SignalQuality.

The two D-Bus services stay behind NetworkProvider. No device, interface, modem path, compositor, or hardware name is encoded. Missing transports remain absent fields in an available snapshot, while an unavailable system bus still returns None.

Demo composition

The demo no longer constructs BacklightProvider; that optional crate remains available to toolkit consumers. Its right cluster now grows inward as wifi, wired when present, cellular, and battery. Wifi uses concentric strength arcs, while cellular retains ascending strength bars. Both icons can coexist and the flexible center spacer remains clear.

Verification

The local regression suite covers an empty transport snapshot, unavailable system bus, simultaneous wifi/cellular layout, shape-only icons, and the center-clearance invariant. The live phone test target reported a registered LTE/5G modem with 57% recent signal through ModemManager while NetworkManager reported an independent wifi connection.

Verified on 1 August 2026:

$ cargo fmt --all -- --check
(no output, exit 0)

$ cargo test --workspace --all-targets
29 passed, 0 failed

$ cargo clippy --workspace --all-targets --all-features -- -D warnings
Finished, no warnings

$ mdbook build
INFO HTML book written to `/home/vdzee/proj/patin/book`

$ git diff --check
(no output, exit 0)

The matching source files were copied to the aarch64 phone test tree and their SHA-256 hashes matched the local files. Its native locked release build completed in 11.50 seconds. After installing only the demo executable and restarting only its transient user service, the live provider reported:

NetworkSnapshot { wifi: Some(70), cellular: Some(59), wired: false }
$ systemctl --user is-active patin-bar.service
active

The running composition therefore exercised simultaneous NetworkManager wifi and ModemManager cellular signal without a compositor restart.