Streamline

Streamline is a multi-platform Flutter client for Decent Espresso machines. It connects to DecentBridge — a C++/Qt server that handles BLE communication with DE1 machines and scales — and provides a modern UI for controlling your machine, managing profiles, and tracking shots.

Architecture

Device <-BLE-> DecentBridge (server) <-HTTP/WS-> Streamline (client)

Streamline is a client-only app. All device communication goes through DecentBridge's REST API and WebSocket API. Streamline auto-discovers DecentBridge on the local network via mDNS/Zeroconf.

Supported Platforms

• Android (primary — ships on Decent tablets)
• macOS
• Linux (x86_64 + ARM64/Raspberry Pi)
• Windows

Features

Machine Control

• Query and set machine state (on/off, espresso, steam, hot water, flush)
• Configure machine settings (temperatures, flow rates, fan threshold, USB charger mode)
• Upload v2 JSON profiles to the machine
• Real-time shot data streaming (pressure, flow, temperature)

Scale Support

• Real-time weight streaming
• Tare control
• Automatic connection via DecentBridge

Profiles

• Built-in library of curated default profiles
• Import/export profile collections
• Content-based deduplication (identical profiles share the same ID)
• Profile versioning with parent-child lineage tracking

Plugins

Streamline features a JavaScript plugin system for extending functionality. Read more.

WebUI

Streamline can serve a web-based UI skin (e.g., the Streamline Project skin) on localhost:3000, viewable in any browser on the same device.

Building

Prerequisites

• Flutter SDK (Dart ^3.7.0)
• Platform-specific toolchains (Android SDK, Xcode, Visual Studio, etc.)

Build & Run

Use the build wrapper script to inject git metadata:

./flutter_with_commit.sh run                           # Run the app
./flutter_with_commit.sh run --dart-define simulate=1  # Run with simulated devices
./flutter_with_commit.sh build apk --release           # Android APK
./flutter_with_commit.sh build macos --release         # macOS
./flutter_with_commit.sh build linux --release         # Linux
./flutter_with_commit.sh build windows --release       # Windows

Or use Flutter directly (without build info injection):

flutter pub get          # Install dependencies
flutter test             # Run all tests
flutter analyze          # Static analysis
flutter run -d windows   # Run on Windows

On Windows, you can also use run.bat for quick launching.

Docker-based Linux ARM64 builds

Requires Colima: make build-arm

Configuration

Bridge Connection

Streamline auto-discovers DecentBridge via mDNS. If auto-discovery doesn't work, you can manually configure in Settings:

• Bridge Host: IP address of the DecentBridge server
• Bridge HTTP Port: REST API port (default: 8080)
• Bridge WS Port: WebSocket port (default: 8081)

Credits

Streamline is built on top of ReaPrime by @tadelv.

REA stands for "Reasonable Espresso App". Credit for the name goes to @randomcoffeesnob. Thanks to @mimoja for the first Flutter app version.