OEM Ecosystem

The Huepar app isn’t just for Huepar devices - it’s a white-label platform supporting multiple brands and manufacturers. This page explains the ecosystem.

The Hidden OEM: Longshuo Technology

Note

Key Finding: The Huepar S120 is manufactured by Longshuo Technology (龙硕科技), a Chinese electronics OEM. Huepar is a brand/reseller, not the hardware manufacturer.

The APK contains manufacturer identification strings:

Device Type	Manufacturer URL	Service UUID
LDM_M1	www.longshuo-tech.com.cn	0xAE30
LDM_M2	www.sndway.com	0xFFF0
LDM_M3	xintong	0x1000
laserLevel_M1	www.levelsure.com	0xFFF0
laserLevel_M2	www.levelsure.com - 603BT	0xFFA0
laserLevel_M3	www.levelsure.com - DP	0xFFE0

The S120 uses LDM_M1 with service UUID 0xAE30, identifying it as Longshuo hardware.

Multiple Brands, Same App

The APK is configured to build for multiple app store listings:

Package Name	Brand	Notes
com.pairlink.futian.huepar	Huepar	Primary listing
com.insona.laser.levelsure	Levelsure	Laser levels
com.pairlink.leiwo.lasercontroller	Leiwo	iOS variant
com.ancoratools.laser	Ancora Tools	Rebranded
dk.elma.laser	Elma	European market

Privacy Implication

All these “different” apps share the same backend (app.huepar.com). User accounts, posts, and data are potentially shared across all brands.

Architecture Diagram

                    ┌─────────────────────────────────┐
                    │      app.huepar.com             │
                    │      (Shared Backend)           │
                    │  - User accounts                │
                    │  - Forum posts                  │
                    │  - Device telemetry             │
                    └─────────────────────────────────┘
                               ▲
                               │ REST API
           ┌───────────────────┼───────────────────┐
           │                   │                   │
    ┌──────┴──────┐     ┌──────┴──────┐    ┌──────┴──────┐
    │  Huepar App │     │ Levelsure   │    │  Elma App   │
    │  (Android)  │     │    App      │    │  (Android)  │
    └─────────────┘     └─────────────┘    └─────────────┘
           │                   │                   │
           │ BLE               │ BLE               │ BLE
           ▼                   ▼                   ▼
    ┌─────────────┐     ┌─────────────┐    ┌─────────────┐
    │  Longshuo   │     │  SNDway     │    │  Longshuo   │
    │  Hardware   │     │  Hardware   │    │  Hardware   │
    │  (0xAE30)   │     │  (0xFFF0)   │    │  (0xAE30)   │
    └─────────────┘     └─────────────┘    └─────────────┘

Device Type Detection

The app identifies devices by matching BLE service UUIDs during scanning:

// From decompiled APK
const DEVICE_CONFIGS = {
  LDM_M1: { serviceUUID: '0xAE30', manufacturer: 'longshuo' },
  LDM_M2: { serviceUUID: '0xFFF0', manufacturer: 'sndway' },
  LDM_M3: { serviceUUID: '0x1000', manufacturer: 'xintong' },
  // ... laser levels use different UUIDs
};

When connecting, the app selects the appropriate protocol based on the detected device type.

Protocol Variations

Different manufacturers use different protocol versions:

Manufacturer	Protocol	Key Differences
Longshuo (S120)	LDMv1	Commands start with F1
SNDway	LDMv1 variant	Similar but different UUIDs
Levelsure	LaserLevelV1/V2/V3	Fan control, horizontal/vertical modes

Why This Matters

Understanding the OEM ecosystem helps explain:

1. Protocol similarities - If you reverse engineer one Longshuo device, others likely work the same way
2. App behavior - The app contains code for devices you don’t own
3. Privacy concerns - Your data may be associated with multiple brand ecosystems
4. Support quality - Huepar support may not have deep hardware knowledge (they’re a reseller)

Finding Your Device’s OEM

To identify which OEM made your device:

1. Scan for BLE services - The service UUID indicates the manufacturer
2. Check the app logs - Device type is logged during connection
3. Compare protocols - The command format reveals the protocol family

Service UUID	Likely OEM
0xAE30	Longshuo Technology
0xFFF0	SNDway or Levelsure
0x1000	Xintong
0xFFA0	Levelsure (603BT series)
0xFFE0	Levelsure (DP series)

Related Pages

• Security & Privacy Analysis - Privacy implications of this ecosystem
• BLE Service Reference - Service UUID details