AndroBash
Sub-Millisecond Hardware Bridge & Rust Async Daemon
“Turning discarded silicon into daily-driver infrastructure through bare-metal Linux bridges and a 4.2 MB asynchronous Rust daemon.”
Executive Overview
AndroBash is an ultra-low-latency systems bridge that integrates Android hardware peripherals (specifically a Samsung Galaxy S8+) directly into an Arch Linux Hyprland desktop. Born from operating on salvaged bare-metal hardware, it deploys a compiled asynchronous Rust daemon over USB AOA v2 endpoints clocking 0.8ms latency at 4.2 MB RSS.
The Problem: High Latency of Network Bridges
Standard ADB over Wi-Fi or TCP loopbacks introduce 45ms–120ms of jitter and excessive context switching, rendering mobile hardware unusable as interactive desktop peripherals.
- Interactive mouse steering and HUD telemetry feel laggy over network sockets.
- Generic ADB servers consume 80MB–140MB of memory on resource-constrained systems.
- The goal was bare-metal performance: sub-millisecond input synthesis and hardware biometric authentication.
The Constraints: Raw USB Endpoints & Zero Heap Thrashing
The bridge needed to bypass user-space networking entirely and bind directly to Linux kernel subsystems.
USB AOA v2 Bulk Transport
The daemon initiates the Android Open Accessory handshake over USB control endpoints, switching the phone into raw AOA mode with bulk endpoints.
Zero-Allocation DMA Ring Buffers
Touch coordinates, sensor telemetry, and video frames stream directly into pre-allocated memory buffers, eliminating heap allocation overhead.
Bare-Metal USB Bridge Topology
┌────────────────────────────────────────────────────────┐
│ SAMSUNG GALAXY S8+ (HARDWARE) │
│ Iris Sensors · Touch Digitizer · Battery Sensors │
└───────────────────────────┬────────────────────────────┘
│ (Raw USB AOA v2 Packets)
▼
┌────────────────────────────────────────────────────────┐
│ ANDROBASH ASYNC RUST DAEMON │
│ Tokio Event Loop · < 4.2 MB RSS · 0.8ms Ping │
└───────────────┬────────────────────────┬───────────────┘
│ │
▼ ▼
┌───────────────────────────────┐ ┌──────────────────────┐
│ LINUX KERNEL uinput │ │ LINUX PAM AUTH │
│ Virtual HID Keyboard/Mouse │ │ /etc/pam.d/hyprlock│
│ Direct Wayland Compositor │ │ Iris Scan Unlock │
└───────────────────────────────┘ └──────────────────────┘Kernel uinput Device Synthesis
Translates mobile digitizer coordinates into virtual Linux kernel input events (/dev/uinput), feeding directly into the Wayland compositor.
Linux PAM Biometric Iris Auth
Integrates the phone’s hardware iris scanner into the Linux PAM subsystem (/etc/pam.d/hyprlock), allowing passwordless desktop unlock.
Achieving Sub-Millisecond Deterministic Latency
By writing the desktop daemon in asynchronous Rust with Tokio and pinning packet processing to a dedicated asynchronous event loop, AndroBash eliminated user-space buffer bloat.
Roundtrip communication clocked at 0.8ms with a resident memory footprint of just 4.2 MB RSS, providing seamless desktop cursor control.
“By implementing raw USB Android Open Accessory protocols within a zero-allocation asynchronous Rust daemon, AndroBash bypassed user-space networking overhead to achieve sub-millisecond hardware peripheral synthesis and Linux PAM biometric authentication at a 4.2 MB resident memory footprint.”