Add script to test the LED jumper.

usb/read-led-jumper.js

@@ -0,0 +1,42 @@
+#!/usr/bin/env node
+'use strict';
+
+var usb = require('usb');
+var util = require('./util');
+
+var vid = 0x16d3;
+var pid = 0x05ea;
+var readLedJumperCommandId = 8;
+
+var device = usb.findByIds(vid, pid);
+device.open();
+
+var usbInterface = device.interface(0);
+if (usbInterface.isKernelDriverActive()) {
+    usbInterface.detachKernelDriver();
+}
+usbInterface.claim();
+
+var endpointIn = usbInterface.endpoints[0];
+var endpointOut = usbInterface.endpoints[1];
+
+function readLedJumper() {
+    var payload = new Buffer([readLedJumperCommandId]);
+    console.log('Sending ', util.bufferToString(payload));
+    endpointOut.transfer(payload, function(err) {
+        if (err) {
+            console.error("USB error: %s", err);
+            process.exit(1);
+        }
+        endpointIn.transfer(64, function(err2, receivedBuffer) {
+            if (err2) {
+                console.error("USB error: %s", err2);
+                process.exit(2);
+            }
+            console.log('Received', util.bufferToString(receivedBuffer));
+            setTimeout(readLedJumper, 500)
+        })
+    });
+}
+
+readLedJumper();