Web Bluetooth — webserial-core demo

Uses Nordic UART Service (NUS) over GATT. Compatible: nRF52, ESP32 BLE UART, or any NUS device (6e400001-…).
Requires HTTPS or localhost + Chromium with Web Bluetooth enabled.

Connection

Buffer Size

Cmd Timeout (ms)

Handshake Timeout (ms)

Baud rate is not used over BLE — link speed is negotiated at the GATT level.

Message Format

Delimiter

Prepend

Append

Handshake on Connect

Sent automatically right after the GATT link opens. Leave Command empty to skip entirely.

Command to send

Mode

Expected (empty = no check)

Mode

Saved Commands

Pre-defined commands to send. Use HEX for raw bytes.

Name

Command

Mode

Data Listeners

Patterns for on('serial:data') — skeleton code in download.

Name

Pattern

Match

Download Code

Class / File name

TypeScript JavaScript

Standalone file Full project (ZIP)

Import config

Pair a Bluetooth device to begin

📡

Pair a BLE device to begin

Code Preview device.ts