Universal BLE

Universal BLE is an open-source developer tool for exploring and testing Bluetooth Low Energy (BLE) devices. It empowers developers, engineers, and hobbyists to discover, connect, and debug BLE devices with a consistent cross-platform experience.

Key Features

Device Discovery

Real-time scanning — Discover nearby BLE devices with live results; scanning continues when you open a device's detail screen
Flexible filters — Filter by service UUIDs, name prefix, or manufacturer data (comma- or newline-separated)
Saved filter presets — Save, rename, and reuse filter combinations; filters persist across app sessions
Search — Search devices by name or by company name (resolved from manufacturer data via Bluetooth company identifiers)
Sort options — Sort the device list by RSSI, last seen, or name
Company identification — Show company name from manufacturer data using the Bluetooth SIG company identifier list
RSSI and advertisements — View signal strength (RSSI), last advertisement (name, RSSI, timestamp), and a list of received ads that flashes on new advertisements
System devices — On supported platforms, view and connect to devices already connected at the system level (with optional service filter)

Connection Management

Connect and disconnect — Connect to and disconnect from BLE peripherals with one tap
Auto-reconnect — Optional auto-connect for reconnection when a device becomes available again
Connection state — Real-time connection state updates
Multiple connections — Support for multiple simultaneous device connections

Service & Characteristic Exploration

GATT discovery — Discover all services and characteristics on connected devices with detailed, human-readable formatting
Favorite services — Mark services as favorites; they appear first in the list (system services last)
Property filters — Filter characteristics by property (read, write, notify, indicate, etc.) with visual filter chips
Navigation — Previous/next buttons to move between characteristics without collapsing the list
Copy services — Copy the full discovered GATT layout (e.g. for documentation or debugging) from the Services panel header

Data Operations

Read — Read characteristic values on demand
Write — Write data to characteristics (with or without response)
Subscribe — Subscribe to notifications/indications per characteristic or "subscribe to all" for notifiable characteristics
Live updates — Incoming values are shown in the logs with timestamps; clear or copy the full log

Pairing & Security

Pair and unpair — Initiate pairing and unpair devices when supported
Pairing state — Monitor pairing state changes in real time

Advanced & Developer Options

MTU — Request a larger MTU (e.g. 247) for better throughput where supported
Command queue — Choose queue type in the drawer: Global (single queue), Per Device, or None (parallel)
Configurable timeout — Set operation timeout (e.g. 10 seconds) for all BLE operations
Logs — Operation log with copy-all and per-entry clear; comprehensive error handling with detailed codes
UUID formats — Accepts common UUID string formats (e.g. with or without hyphens)

UI & Cross-Platform

Responsive layout — Adapts to mobile, tablet, and desktop (e.g. breakpoints at 600px and 1000px)
Bluetooth status — Bluetooth availability icon with tooltip (tap on mobile to see state)
Permissions — Guided permission flow where required (e.g. location for BLE on Android); re-checks on app resume
Cross-platform — Built with the universal_ble plugin for consistent behavior across supported platforms


Perfect For

Developers building BLE-enabled applications
Engineers testing and debugging BLE devices
Hobbyists exploring IoT and smart device capabilities
Students learning about Bluetooth Low Energy technology
QA teams validating BLE device functionality