Platform Overview
Real-time monitoring of the wireless audio streaming platform. TypeScript/Node.js back-end services powering multi-room audio, device pairing, firmware OTA, and content delivery across consumer and enterprise product lines.
2,847
Connected Devices
▲ 12% this week
14.2K
Active Streams
▲ 8% today
18ms
Avg Latency
▼ 3ms improved
99.97%
Platform Uptime
SLA: 99.9%
♫ Live Audio Stream – Multi-Room Sync
Codec: AAC-LC 256kbps / 48kHz
● Synced: 4 rooms
🛠 Technology Stack
◇ TypeScript
◉ Node.js
☁ AWS Lambda
◫ MongoDB
📦 AWS S3
⚙ C++
↔ RESTful APIs
◆ GraphQL
△ Angular
λ Serverless
⚡ Service Health
audio-streaming-service
Node.js · 4 replicas · p99: 12ms
device-pairing-service
TypeScript · 2 replicas · p99: 24ms
firmware-ota-service
Node.js · 2 replicas · p99: 45ms
content-delivery-api
Lambda · auto-scale · p99: 8ms
analytics-pipeline
TypeScript · 1 replica · p99: 120ms
user-auth-service
Node.js · 3 replicas · p99: 15ms
Microservices Architecture
TypeScript/Node.js back-end services built with Express, deployed as containerized microservices. Each service owns its domain, communicates via REST/GraphQL, and publishes events to an MQTT broker for real-time device updates.
📡 Audio Streaming Service
// audio-streaming-service/src/controllers/stream.controller.ts
import { Request, Response } from 'express';
import { StreamService } from '../services/stream.service';
import { AudioCodec, StreamConfig } from '../types/audio.types';
export class StreamController {
constructor(private streamService: StreamService) {}
async createMultiRoomStream(req: Request, res: Response) {
const config: StreamConfig = {
codec: AudioCodec.AAC_LC,
bitrate: 256000,
sampleRate: 48000,
channels: req.body.roomIds.length,
syncMode: 'tight',
};
const stream = await this.streamService.initializeStream(config);
await this.streamService.syncRooms(stream.id, req.body.roomIds);
return res.status(201).json({ streamId: stream.id, status: 'active' });
}
}
🔗 Device Pairing Service
// device-pairing-service/src/handlers/pairing.handler.ts
import { DeviceRepository } from '../repositories/device.repository';
import { MQTTBroker } from '../infrastructure/mqtt.broker';
interface PairingRequest {
deviceId: string;
productLine: 'consumer' | 'enterprise';
firmwareVersion: string;
protocolVersion: number;
}
export class PairingHandler {
async initiatePairing(request: PairingRequest): Promise<PairingResult> {
const device = await this.deviceRepo.findOrCreate(request.deviceId);
const token = await this.generateSecureToken(device);
await this.mqtt.publish(`devices/${device.id}/paired`, {
token, expiresAt: Date.now() + 3600000,
});
return { success: true, token, deviceId: device.id };
}
}
💾 Firmware OTA Update Service
// firmware-ota-service/src/services/ota.service.ts
import { S3Client, GetObjectCommand } from '@aws-sdk/client-s3';
import { DeviceModel } from '../models/device.model';
export class OTAService {
private s3: S3Client;
async checkForUpdate(deviceId: string, currentVersion: string) {
const device = await DeviceModel.findById(deviceId);
const latest = await this.getLatestFirmware(device.productLine);
if (this.isNewerVersion(latest.version, currentVersion)) {
const signedUrl = await this.generatePresignedUrl(latest.s3Key);
return { updateAvailable: true, version: latest.version, url: signedUrl };
}
return { updateAvailable: false };
}
}
RESTful APIs & GraphQL
Dual API layer: RESTful endpoints for CRUD operations and device management, plus a GraphQL gateway for flexible client queries across the wireless audio product suite.
↔ REST API Endpoints
GET/api/v1/devicesList paired devices
POST/api/v1/devices/pairInitiate device pairing
GET/api/v1/streams/:idGet stream status
POST/api/v1/streams/multiroomCreate multi-room session
PUT/api/v1/devices/:id/firmwareTrigger OTA update
GET/api/v1/products/:line/catalogProduct catalog
DELETE/api/v1/streams/:idEnd stream session
POST/api/v1/analytics/eventsIngest usage events
◆ GraphQL Gateway
query GetDeviceStream($deviceId: ID!) {
device(id: $deviceId) {
id
name
productLine
firmwareVersion
activeStream {
id
codec
bitrate
rooms {
id
name
volume
syncOffset
}
latencyMs
status
}
lastSeen
}
}
{
"data": {
"device": {
"id": "dev_a4f82c",
"name": "Living Room Speaker",
"productLine": "consumer",
"firmwareVersion": "3.2.1",
"activeStream": {
"id": "str_7b3e9a",
"codec": "AAC-LC",
"bitrate": 256000,
"rooms": [
{ "id": "rm_01", "name": "Living Room", "volume": 72, "syncOffset": 0 },
{ "id": "rm_02", "name": "Kitchen", "volume": 55, "syncOffset": 2 }
],
"latencyMs": 18,
"status": "STREAMING"
},
"lastSeen": "2024-01-15T14:32:01Z"
}
}
}
🔬 API Response Simulation
[Ready] Click a button to simulate an API call...
AWS Cloud Infrastructure
Serverless compute with Lambda functions, persistent storage with MongoDB Atlas, and content/firmware delivery through S3 with CloudFront CDN.
λ Lambda Functions
audioProcessorFn
Runtime: Node.js 20.x · 512MB · 15s timeout
Invocations: 42.3K/day
Avg: 45ms
deviceEventHandlerFn
Runtime: Node.js 20.x · 256MB · 10s timeout
Invocations: 128.7K/day
Avg: 12ms
firmwareValidatorFn
Runtime: Node.js 20.x · 1024MB · 30s timeout
Invocations: 850/day
Avg: 2.1s
analyticsAggregatorFn
Runtime: Node.js 20.x · 512MB · 60s timeout
Invocations: 24/day (scheduled)
Avg: 8.4s
◫ MongoDB Atlas – Collections
| Collection | Documents | Avg Size | Indexes | Usage |
|---|---|---|---|---|
| devices | 284,712 | 1.2 KB | 4 | Registered devices & configs |
| streams | 1,420,000 | 0.8 KB | 6 | Active/historical stream sessions |
| firmwareVersions | 342 | 4.8 KB | 3 | Firmware metadata & changelogs |
| userProfiles | 189,450 | 2.1 KB | 5 | User preferences & rooms |
| analyticsEvents | 52,000,000 | 0.3 KB | 8 | Usage telemetry (TTL: 90d) |
| productCatalog | 156 | 6.4 KB | 3 | Products across all lines |
📦 S3 Buckets
🎵audio-platform-firmware2.4 GB · 342 objects
📷audio-platform-assets18.7 GB · 12,450 objects
📊audio-platform-analytics45.2 GB · partitioned by date
📚audio-platform-logs8.1 GB · lifecycle: 30d expire
💻 Lambda Handler – Device Event Processor
// lambdas/device-event-handler/index.ts
import { SQSEvent, Context } from 'aws-lambda';
import { MongoClient } from 'mongodb';
import { publishToIoT } from './iot-publisher';
const client = new MongoClient(process.env.MONGO_URI!);
export const handler = async (event: SQSEvent, ctx: Context) => {
const db = client.db('audio-platform');
for (const record of event.Records) {
const payload = JSON.parse(record.body);
switch (payload.eventType) {
case 'DEVICE_CONNECTED':
await db.collection('devices').updateOne(
{ deviceId: payload.deviceId },
{ $set: { lastSeen: new Date(), status: 'online' } }
);
break;
case 'STREAM_STARTED':
await publishToIoT(payload.deviceId, { action: 'sync' });
break;
}
}
return { statusCode: 200, processed: event.Records.length };
};
C++ Firmware & DSP Layer
Low-level audio processing firmware written in C++ for the wireless audio hardware. Handles codec negotiation, DSP effects, Bluetooth/Wi-Fi transport, and real-time audio buffer management.
⚙ Firmware Metrics
48kHz
Sample Rate
5.2ms
DSP Latency
24-bit
Bit Depth
-92dB
Noise Floor
💻 Audio DSP Pipeline (C++)
// firmware/src/audio/dsp_pipeline.hpp
#pragma once
#include <cstdint>
#include <array>
#include "codec_interface.hpp"
#include "transport_layer.hpp"
namespace audio {
class DSPPipeline {
public:
struct Config {
uint32_t sampleRate = 48000;
uint8_t bitDepth = 24;
uint8_t channels = 2;
uint16_t bufferSize = 256; // frames per buffer
};
explicit DSPPipeline(const Config& cfg);
// Process audio buffer through DSP chain
void processBlock(float* input, float* output, size_t numFrames);
// Apply EQ settings from cloud profile
void setEqualizer(const std::array<float, 10>& bands);
// Multi-room synchronization offset
void setSyncOffset(int64_t microseconds);
private:
Config m_config;
std::array<float, 10> m_eqBands;
CodecInterface* m_codec;
TransportLayer* m_transport;
void applyEQ(float* buffer, size_t frames);
void applyDynamicRange(float* buffer, size_t frames);
void resample(float* input, float* output, size_t inFrames, size_t outFrames);
};
} // namespace audio
📡 Bluetooth/Wi-Fi Transport (C++)
// firmware/src/transport/wifi_streamer.cpp
#include "wifi_streamer.hpp"
#include "ring_buffer.hpp"
void WiFiStreamer::startStream(const StreamParams& params) {
m_ringBuffer = std::make_unique<RingBuffer>(
params.bufferSize * params.channels * sizeof(float)
);
m_socket.connect(params.endpoint, params.port);
m_socket.setNonBlocking(true);
m_socket.setNoDelay(true); // TCP_NODELAY for low-latency
m_thread = std::thread([this]() {
while (m_running.load()) {
auto chunk = m_ringBuffer->read(m_chunkSize);
if (chunk.size() > 0) {
m_socket.send(chunk.data(), chunk.size());
m_bytesSent += chunk.size();
}
std::this_thread::sleep_for(std::chrono::microseconds(100));
}
});
}
Angular Front-End Application
Enterprise Angular 17 application providing device management, streaming control, analytics dashboards, and admin panels for the audio product suite.
△ Angular Component – Device Dashboard
// src/app/features/devices/device-dashboard.component.ts
import { Component, OnInit, inject } from '@angular/core';
import { DeviceService } from '../../services/device.service';
import { Device } from '../../models/device.model';
import { Observable } from 'rxjs';
@Component({
selector: 'app-device-dashboard',
standalone: true,
template: `
<div class="dashboard-grid">
@for (device of devices$ | async; track device.id) {
<app-device-card
[device]="device"
(onStream)="startStream($event)"
(onUpdate)="triggerOTA($event)" />
}
</div>
`,
})
export class DeviceDashboardComponent implements OnInit {
private deviceService = inject(DeviceService);
devices$: Observable<Device[]>;
ngOnInit() {
this.devices$ = this.deviceService.getConnectedDevices();
}
startStream(deviceId: string) {
this.deviceService.createStream(deviceId).subscribe();
}
triggerOTA(deviceId: string) {
this.deviceService.initiateOTA(deviceId).subscribe();
}
}
🔨 Angular Service – GraphQL Integration
// src/app/services/device.service.ts
import { Injectable, inject } from '@angular/core';
import { Apollo, gql } from 'apollo-angular';
import { HttpClient } from '@angular/common/http';
import { map } from 'rxjs/operators';
const GET_DEVICES = gql`
query GetDevices($productLine: ProductLine) {
devices(filter: { productLine: $productLine, status: ONLINE }) {
id name firmwareVersion productLine
activeStream { id codec bitrate rooms { name volume } }
}
}
`;
@Injectable({ providedIn: 'root' })
export class DeviceService {
private apollo = inject(Apollo);
private http = inject(HttpClient);
getConnectedDevices(line?: string) {
return this.apollo.watchQuery({
query: GET_DEVICES,
variables: { productLine: line },
pollInterval: 5000,
}).valueChanges.pipe(map(r => r.data.devices));
}
createStream(deviceId: string) {
return this.http.post('/api/v1/streams/multiroom', { deviceId });
}
initiateOTA(deviceId: string) {
return this.http.put(`/api/v1/devices/${deviceId}/firmware`, {});
}
}
🎨 Angular Module Structure
// Application module layout
src/app/
├── core/
│ ├── interceptors/ // Auth, error, retry interceptors
│ ├── guards/ // Route guards for enterprise admin
│ └── services/ // Singleton services
├── features/
│ ├── devices/ // Device management feature
│ ├── streaming/ // Audio streaming controls
│ ├── firmware/ // OTA management dashboard
│ ├── analytics/ // Usage analytics & charts
│ └── admin/ // Enterprise admin panel
├── shared/
│ ├── components/ // Reusable UI components
│ ├── pipes/ // Custom pipes (format, filter)
│ └── directives/ // Custom directives
└── graphql/
├── queries/ // GraphQL query definitions
├── mutations/ // GraphQL mutation definitions
└── fragments/ // Shared GraphQL fragments
System Architecture
End-to-end wireless audio platform architecture spanning from C++ firmware on devices, through Node.js/TypeScript middleware and AWS serverless compute, to Angular front-end applications.
🏗 Platform Layers
Presentation Layer – Angular 17
Device Dashboard • Streaming Control • Admin Panel • Analytics • OTA Management
API Gateway – GraphQL + REST
Apollo Server • Express.js • JWT Auth • Rate Limiting • Request Validation
Microservices – TypeScript / Node.js
Audio Streaming • Device Pairing • Firmware OTA • Content Delivery • User Management • Analytics
Serverless Compute – AWS Lambda
Event Processing • Audio Transcoding • Firmware Validation • Analytics Aggregation • Notification Dispatch
Data Layer – MongoDB + S3
MongoDB Atlas (devices, streams, users) • S3 (firmware, assets, logs) • ElastiCache (sessions) • SQS (events)
Hardware / Firmware – C++
DSP Pipeline • Codec Engine • BT/Wi-Fi Transport • Multi-Room Sync • OTA Bootloader
🚀 Deployment Pipeline
1. TypeScript Compilation & Lint
tsc --strict + ESLint
2. Unit & Integration Tests
Jest + Supertest · 94% coverage
3. Docker Build & Push
ECR · multi-stage builds
4. Lambda Deploy
SAM / CDK · canary deploys
5. Angular Build & CDN Deploy
ng build · CloudFront
6. E2E Smoke Tests
Cypress · critical paths
🔐 Security & Compliance
OAuth 2.0 + JWT
Authentication
AES-256
Encryption at Rest
TLS 1.3
Transport Security
SOC 2 Type II
Compliance