A C# implementation of the Expert Electronics TCI (Transceiver Control Interface) Protocol v2.0 — the WebSocket-based control / streaming protocol used by ExpertSDR3 and the SunSDR family of transceivers. Targets .NET 10.

The upstream protocol specification lives at ExpertSDR3/TCI.

src/
  ExpertElectronics.Tci/         ← protocol library
  ExpertElectronics.Tci.Client/  ← cross-platform Avalonia desktop client
tests/
  ExpertElectronics.Tci.Tests/   ← xUnit tests
docs/
  ARCHITECTURE.md                ← architecture & TCI command/event matrix
CLAUDE.md                        ← guidance for the Claude Code assistant

# Build the whole solution
dotnet build TciClient.sln

# Run unit tests
dotnet test tests/ExpertElectronics.Tci.Tests/ExpertElectronics.Tci.Tests.csproj

# Run the desktop client (defaults to ws://localhost:40001; receive-only by default)
dotnet run --project src/ExpertElectronics.Tci.Client

# To allow microphone capture and TX audio to the radio, opt in explicitly:
dotnet run --project src/ExpertElectronics.Tci.Client -- --enable-tx

The Avalonia client targets net10.0 and runs on macOS (x64/arm64), Windows (x64), and Linux (x64) out of the box. Audio playback / capture uses Silk.NET.OpenAL.Soft — the native OpenAL-Soft binaries ship with the NuGet package, so no system install is required.

Features:

• Connection panel (host + port).
• Auto-discovery of every transceiver reported by the TCI server.
• Per-transceiver card with Start RX / Stop RX / Start TX / Stop TX buttons, live VFO/modulation readouts, and a sample-rate / byte-counter meter.
• TX audio is opt-in via the --enable-tx CLI flag. Without it the Start TX button reports the safety guard. With it, the client opens a microphone via OpenAL ALC capture, sends TRX:n,true,tci, and streams float32 TX_AUDIO_STREAM packets in response to TX_CHRONO timing markers from the server.
• macOS: the first run with --enable-tx will prompt for microphone permission. Linux: the OpenAL-Soft native will use PulseAudio / PipeWire. Windows: WASAPI via OpenAL-Soft.

The library implements the complete TCI v2.0 surface — every command and event in the upstream PDF — including the new v2.0 additions: VFO_LOCK, RX_CHANNEL_SENSORS, KEYER, CW_KEYER_SPEED, the full receiver DSP block (RX_NB/RX_BIN/RX_NR/RX_ANC/RX_ANF/RX_APF/RX_DSE/RX_NF enables and the RX_NB_PARAM tuning), AGC controls, monitor controls, line-out streaming + recording, audio-stream tuning, spot click notifications, app-focus, and TX/RX sensor reporting.

See docs/ARCHITECTURE.md for the full command matrix and the class that implements each protocol message.

• 2026-05-10 — Restructured into src/ + tests/ layout. Implemented all v2.0 commands and notifications. Added xUnit test project. Wrote CLAUDE.md and docs/ARCHITECTURE.md.
• 2026-01-20 — Updated to .NET 10, minor refactoring for the latest language features.
• 2020-01-30 — Added a GUI test app (StationMonitor).