Hardware Security
Developer Guide

USB Connection Example

// USB HID Transport Implementation
import TransportWebUSB from "@ledgerhq/hw-transport-webusb";

async function connectToDevice() {
  try {
    // Request USB device permission
    const transport = await TransportWebUSB.create();
    
    // Send APDU command
    const command = Buffer.from([
      0xE0,        // CLA: Instruction class
      0x01,        // INS: Get version
      0x00,        // P1: Parameter 1
      0x00,        // P2: Parameter 2
      0x00         // Le: Expected response length
    ]);
    
    // Exchange APDU
    const response = await transport.exchange(command);
    
    console.log("Device response:", response.toString('hex'));
    
    return transport;
  } catch (error) {
    console.error("Connection failed:", error);
  }
}

// Listen for device connection
TransportWebUSB.listen({
  next: (event) => {
    if (event.type === "add") {
      console.log("Device connected:", event.descriptor);
    }
  },
  error: (error) => console.error("USB error:", error),
  complete: () => console.log("Listening stopped")
});