AndroidSCM is an Android app that decodes ERT/SCM smart-meter radio packets directly from an RTL-SDR dongle connected via USB OTG — no PC, no root, no external apps required.

• 📡 Tunes to 912.600 MHz and decodes SCM (Standard Consumption Message) packets in real time
• 🔌 Drives the RTL-SDR dongle natively over USB OTG — no rtl_tcp server needed
• ⚡ Signal processing written in pure C (Manchester matched filter → preamble search → BCH-16 CRC verify)
• 🎯 Dart FFI bridge — zero-copy packet delivery from the C decode thread to the Flutter UI
• 🔁 Duplicate suppression across packet boundaries
• �� Live scrolling packet list with meter ID, type, consumption, tamper flags, and CRC

Flutter UI (Dart)
    │  MethodChannel "com.example.androidscm/usb"
    ▼
MainActivity.kt   ←  Android UsbManager API
    │  returns (fd, devicePath) to Dart after USB permission grant
    ▼
ScmDecoder  (lib/scm_ffi.dart)   ←  dart:ffi
    │  scm_open(fd, path) / scm_start(callback) / scm_stop()
    ▼
libscm_decoder.so   (android/app/src/main/cpp/scm_lib.c)
    │  rtlsdr_open2(fd, path)  ←  librtlsdr  (rtl_tcp_andro submodule)
    │  rtlsdr_read_sync → Manchester filter → preamble search → BCH CRC
    │  NativeCallable  →  Dart Stream<ScmPacket>
    ▼
Flutter UI: live scrolling packet list

• Any Realtek RTL2832U DVB-T USB dongle (VID 0x0BDA)
• Android device with USB host (OTG) support, API 24+
• USB OTG adapter cable

The app auto-launches when the dongle is plugged in and prompts for USB permission on first use.

git clone --recurse-submodules https://github.com/SarahRoseLives/AndroidSCM.git
cd AndroidSCM

Or if you already cloned without --recurse-submodules:

git submodule update --init --recursive

flutter pub get
flutter run

Gradle will automatically compile librtlsdr + libscm_decoder.so via CMake/NDK on the first build.

AndroidSCM/
├── lib/
│   ├── main.dart              # Flutter UI
│   ├── scm_ffi.dart           # Dart FFI bindings
│   └── models/
│       └── scm_packet.dart    # Decoded packet data class
├── android/
│   ├── app/src/main/
│   │   ├── cpp/
│   │   │   ├── scm_lib.c      # C decoder library (rtlsdr_open2 + signal pipeline)
│   │   │   └── CMakeLists.txt
│   │   ├── kotlin/.../MainActivity.kt  # USB MethodChannel bridge
│   │   └── AndroidManifest.xml
│   └── rtl_tcp_andro/         # Git submodule — librtlsdr for Android
└── pubspec.yaml

• rtlamr by bemasher — Go reference implementation, signal parameters, and BCH CRC algorithm
• rtl_tcp_andro by signalwareltd — Android-adapted librtlsdr with rtlsdr_open2 USB fd API

MIT