Automatic Scanning
When you power on RADR, it automatically scans for nearby supported Bluetooth devices.Scan Behavior
- Duration: 5 seconds
- LED Indicator: Blue pulsing during scan
- Status Message: “Searching for nearby devices…”
- RADR broadcasts as “OSSM-REMOTE” with high transmit power (9 dBm)
- It searches for devices advertising supported service UUIDs
- Discovered devices are added to the device list
Manual Scanning
To start a manual scan:- From the main menu, select Device Search
- RADR scans for 5 seconds
- After scanning, the device list appears
Device List
After scanning, the device list shows all discovered devices:- Devices are shown by their advertised Bluetooth name
- If a device has no name, it appears as “Unknown Device”
- The list is scrollable if multiple devices are found
Navigating the Device List
| Control | Action |
|---|---|
| Right Encoder | Scroll through devices |
| Right Button | Connect to selected device |
| Left Button | Cancel and return to main menu |
Connecting to a Device
When you select a device from the list, RADR initiates a connection:Connection Status Messages
You’ll see these status messages in sequence:- “Initializing connection…” — Setting up the connection process
- “Checking existing connections…” — Verifying no conflicts
- “Attempting fast reconnect…” — Trying quick reconnection if previously paired
- “Creating new connection…” — Establishing a new Bluetooth connection
- “Connecting to [address]…” — Connecting to the specific device
- “Connected! Setting up device…” — Connection established, configuring
- “Discovering device capabilities…” — Reading device features
- “Device ready!” — Connection complete, entering control mode
Connection Parameters
RADR uses optimized connection parameters for responsive control:| Parameter | Value |
|---|---|
| Connection interval | 15ms |
| Latency | 0 |
| Timeout | 1500ms |
| Connect timeout | 5000ms |
Connection Failures
If connection fails, you’ll see:- “Connection failed, please try again.” — General connection failure
- “Connection limit reached!” — Too many active BLE connections
- “Device service not found!” — Device doesn’t have expected services
Troubleshooting Connection Issues
Device doesn't appear in scan
Device doesn't appear in scan
- Ensure the device is powered on and in pairing mode
- Move within 1–2 meters for initial pairing
- Close any phone apps that might be connected to the device
- Power-cycle both RADR and the target device
Connection fails repeatedly
Connection fails repeatedly
- Ensure no other app or controller is connected
- Power-cycle the target device
- Move closer to reduce interference
- For OSSM: Ensure firmware is 2.0.0 or higher
Connection drops frequently
Connection drops frequently
- Stay within Bluetooth range (typically 10 meters indoors)
- Reduce interference from WiFi routers and other Bluetooth devices
- Keep phone apps closed to prevent connection stealing
One Device at a Time
To disconnect and switch devices:- From the control screen, press left button to access the menu (when paused)
- Navigate back to the main menu
- Start a new device search
Device Registry
RADR uses a two-tier device registry to identify supported devices:Built-in Registry
- Hardcoded support for Research And Desire devices (OSSM)
- Always available and cannot be modified
- Provides full-featured control interfaces
Dynamic Registry (registry.json)
- Stored in RADR’s internal filesystem (LittleFS)
- Contains Buttplug.io device UUIDs and configurations
- Can be updated via firmware updates without changing the core application
- This allows faster device support additions
The dynamic registry enables Research And Desire to add support for new devices more frequently, as it only requires updating a configuration file rather than the entire firmware.
Supported Device Types
| Device Type | Control Interface |
|---|---|
| OSSM | Full control (Speed, Depth, Sensation, Stroke, Patterns) |
| Lovense | Vibration-only control (0–16 levels) |
| Buttplug.io devices | Varies by device capabilities |
Reconnection Behavior
If RADR loses connection to a device:- RADR automatically attempts to reconnect within 2–5 seconds
- For OSSM: The machine gradually ramps down for safety
- If reconnection fails, return to the main menu and rescan
RADR remembers recently connected devices and attempts fast reconnection when possible.

