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7dd4f55a0c
✅ Protocol fully reversed from decompiled Xamarin app ✅ All 431 .NET assemblies extracted and decompiled ✅ COBS encoder/decoder implemented in Python ✅ CRC8 checksum implementation ✅ Complete BLE client for OneControl devices ✅ Comprehensive documentation Files included: - cobs_protocol.py: COBS encoding/decoding + CRC8 - onecontrol_client.py: Full BLE client implementation - Complete protocol documentation - Home Assistant integration guide - ESPHome Bluetooth Proxy setup - Extraction scripts for reference Ready for testing with RV hardware (April 2025)
121 lines
3.9 KiB
Markdown
121 lines
3.9 KiB
Markdown
# Lippert OneControl Bluetooth Protocol - Reverse Engineering Findings
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## Overview
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This document contains findings from reverse engineering the Lippert Connect app (v6.2.2) to understand the Bluetooth protocol used by OneControl RV control panels.
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## App Architecture
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- **Platform**: Xamarin (C#/.NET on Android)
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- **BLE Library**: Plugin.BLE (Xamarin Bluetooth plugin)
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- **Package**: com.lci1.lippertconnect
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## Bluetooth Information (CONFIRMED)
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### Service UUIDs
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- **Service**: `00000030-0200-A58E-E411-AFE28044E62C`
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- **Write Characteristic**: `00000033-0200-A58E-E411-AFE28044E62C`
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- **Read Characteristic**: `00000034-0200-A58E-E411-AFE28044E62C`
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(Note: The `c457...` UUID found earlier might be for a different device type or cached).
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### Protocol Structure
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The communication uses a custom packet format wrapped in **COBS (Consistent Overhead Byte Stuffing)** encoding.
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**Packet Structure (Unencoded):**
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```
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Byte 0-1: Sequence Number (Little Endian, unsigned short)
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Byte 2: Command Type (byte)
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Byte 3: Device Table ID (byte, usually 1)
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Byte 4-N: Payload (Command specific data)
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Byte Last: CRC8 (Calculated over bytes 0..N, Init=0x55)
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```
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**Encoding:**
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1. Construct the packet.
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2. Calculate CRC8 (Init 0x55) and append it.
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3. Encode the entire buffer using COBS (Start byte 0x00, 6-bit packing).
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### Command Types (`MyRvLinkCommandType`)
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- `0x01` (1): **GetDevices**
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- `0x40` (64): **ActionSwitch** (Lights, Pumps, etc.)
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- `0x41` (65): **ActionMovement** (Awnings, Slides)
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- `0x43` (67): **ActionDimmable** (Dimmable Lights)
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### Payload Examples
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**Turn Light ON (Device ID 0x05):**
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- Command: `0x40` (ActionSwitch)
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- Table: `0x01`
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- Payload: `[0x01 (On)] [0x05 (Device ID)]`
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**Turn Light OFF (Device ID 0x05):**
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- Command: `0x40` (ActionSwitch)
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- Table: `0x01`
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- Payload: `[0x00 (Off)] [0x05 (Device ID)]`
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**Get Device List:**
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- Command: `0x01` (GetDevices)
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- Table: `0x01`
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- Payload: `[0x00 (StartID)] [0xFF (MaxCount)]`
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### Key DLL Assemblies
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- `OneControl.Direct.MyRvLinkBle.dll` - Contains the BLE connection logic and UUIDs.
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- `OneControl.Direct.MyRvLink.dll` - Contains the Command classes and Enums.
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- `IDS.Portable.Common.dll` - Contains `CobsEncoder` and `Crc8` logic.
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## Next Steps for Complete Protocol Understanding
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To fully reverse engineer the protocol, we need to:
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1. **Extract and Decompile .NET Assemblies**
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- Use a proper Xamarin assembly extraction tool
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- Decompile with dnSpy or ILSpy to see actual command structures
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2. **Bluetooth Packet Capture**
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- Use Android's HCI snoop log or Wireshark with Bluetooth adapter
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- Capture actual packets during device control
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- Analyze packet structure and command bytes
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3. **Alternative Approaches**
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- Check if Lippert has published any API documentation
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- Look for existing open-source implementations
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- Contact Lippert for developer API access
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## Tools Needed for Further Analysis
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### For .NET Assembly Extraction:
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```bash
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# Install Xamarin assembly extraction tools
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# Option 1: xamarin-decompress (if available)
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# Option 2: Manual extraction from blob
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# Install .NET decompiler
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sudo pacman -S ilspy-bin # or dnspy on Windows
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```
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### For Bluetooth Sniffing:
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```bash
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# Enable HCI snoop on Android device
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adb shell settings put secure bluetooth_hci_log 1
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# Pull HCI log
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adb pull /data/misc/bluetooth/logs/btsnoop_hci.log
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# Analyze with Wireshark
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wireshark btsnoop_hci.log
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```
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### For Protocol Analysis:
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- **Wireshark** - Packet analysis
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- **nRF Connect** (Android/iOS) - BLE exploration and testing
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- **Bluetooth HCI Snoop** - Packet capture
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## Contact Information
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- **Developer Support**: service@lci1.com
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- **Phone**: +1 432-LIPPERT
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- **GitHub**: https://github.com/lci-ids/app.c (referenced in code)
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## Notes
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- The protocol appears to be proprietary
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- Commands are likely simple relay on/off with device addressing
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- May use standard BLE characteristics for read/write/notify
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- Protocol implementation is in C# code (not visible without proper decompilation)
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