Droprcam

Droprcam is a standalone, lightweight daemon designed to replace the proprietary Nest /usr/bin/connect binary on legacy Dropcam HD (and eventually Dropcam Pro) cameras.

Instead of relying on the Nest cloud, Droprcam boots the hardware from a raw state, initializes the Ambarella DSP and video pipelines, routes the ALSA audio hardware, and exposes everything locally over standard network protocols.

This completely frees the camera, turning it into a standard local IP camera perfect for integration into Home Assistant, Scrypted, or HomeKit.

Plugins (Using this camera as a device on Home Assistant/other)

• Home Assistant

Features

• Zero Cloud Dependency: Runs entirely on the camera's local area network.
• Unified Hardware Control: Initializes the image sensor (OV9710) and configures the Ambarella encoder (mediaserver) to expose standard RTSP video locally.
• Hardware HTTP API: Control the physical IR Cut Filter (Night Vision) and Status LEDs directly via REST endpoints.
• Audio Routing: Unmutes and configures the internal AK4642 stereo codec for immediate microphone and speaker access.
• Live Microphone Feed: Streams raw PCM audio straight from the microphone over HTTP for easy ingestion into ffmpeg.
• Two-Way Audio: Pipe raw audio back to the camera's speaker via the HTTP Intercom API.
• Tiny Footprint: Written in Go and compiled specifically for the Ambarella A5s ARM1136J-S (Linux 2.6.38) constraint (Sub-5MB).

Directory Structure

• /wiki/ - Documentation, reverse-engineering notes, and API references.
• main.go - The core daemon entrypoint.
• hardware.go - Controls hardware initialization (ALSA, init.sh, mediaserver) and GPIO mapping.
• api.go - Exposes the hardware over port 8080.
• stream.go - Prepares the network stream endpoints.
• setup.sh - Automated cross-compilation environment script.

Getting Started

Because the Dropcam uses an aging Linux 2.6.38 kernel, standard Go binaries (1.21+) will crash due to unsupported syscalls, and UPX compression stubs often fail. We must compile this using Go 1.20 with software floating point enabled.

1. Build the Daemon

Simply run the setup script. It will automatically download the correct Go 1.20 toolchain and compile the binary for you:

./setup.sh

2. Deploy to Camera

Once built, transfer the droprcam binary to your camera (which must be in a rooted state). Due to size constraints, place it on the /root/ persistent filesystem.

If you are using the dropcam-rooter exploit, please read the Installation HOWTO for exact instructions on how to hook the daemon into the boot sequence!

# On the camera telnet shell
cd /root
# Download binary...
chmod +x /root/droprcam

# Start the daemon manually (if not using the boot wrapper)
/root/droprcam

3. Usage & Integration

• Video: The daemon starts the stock Ambarella encoder. Access the video stream at: rtsp://<camera_ip>/stream1
• Audio/Control: Read the API Wiki for how to pull the microphone feed and control Night Vision.