Merge pull request #89 from particle-iot/feature/dfu-impl

Feature/dfu impl

src/device-base.js

@@ -150,7 +150,9 @@ class DeviceBase extends EventEmitter {
 		}).then(() => {
 			this._log.trace('Device is open');
 			this._maxActiveReqs = options.concurrentRequests;
-			this._resetAllReqs = true; // Reset all requests remaining from a previous session
+			if (!this._dfu) {
+				this._resetAllReqs = true; // Reset all requests remaining from a previous session
+			}
 			this._state = DeviceState.OPEN;
 			this.emit('open');
 			this._process();
@@ -636,6 +638,7 @@ class DeviceBase extends EventEmitter {
 			this._state = DeviceState.CLOSED;
 			this._wantClose = false;
 			this._maxActiveReqs = null;
+			this._dfu = null;
 			this._fwVer = null;
 			this._id = null;
 			if (emitEvent) {

src/dfu-device.js

@@ -0,0 +1,19 @@
+const DfuDevice = (base) => class extends base {
+	/**
+	 * Flashes the firmware over DFU interface.
+	 *
+	 * @param {Number} altSetting The interface alternate setting.
+	 * @param {Buffer} buffer The binary firmware data to be flashed.
+	 * @param {Number} addr The starting address where the firmware will be written.
+	 * @param {Object} options Optional options for the flashing process.
+	 * @returns {Promise<void>} A Promise that resolves when the firmware is successfully flashed.
+	 */
+	async writeOverDfu(altSetting, buffer, addr, options) {
+		await this._dfu.setAltSetting(altSetting);
+		await this._dfu.doDownload(addr, buffer, options);
+	}
+};
+
+module.exports = {
+	DfuDevice
+};