# developerkayitha2095-ops/ptt-walkie architecture

> Architecture diagram of the GitHub repository developerkayitha2095-ops/ptt-walkie, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-11-15). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/developerkayitha2095-ops/ptt-walkie
- Repository: https://github.com/developerkayitha2095-ops/ptt-walkie

## Overview

PTT Walkie is a mobile-only, encrypted push-to-talk web app with a Node.js half-duplex relay. A user opens the client, joins a channel using a short code, and presses to talk; the client encodes and encrypts audio before sending it through the relay to other members. The client also supports QR-based channel entry, roster and connection recovery. The excerpts show the client’s audio, transport and scanner mechanisms and the relay’s room rules; unsampled UI and relay details are represented only where the README documents them.

Main entry points: [`client/app.js`](https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/client/app.js) (Client application), [`server/server.js`](https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/server/server.js) (Room and PTT control), [`client/index.html`](https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/client/index.html) (Web interface), [`client/codec.js`](https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/client/codec.js) (Voice codec)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_client["Mobile client"]
  node_interface["Web interface<br/>[index.html]"]
  node_app["Client application<br/>[app.js]"]
  node_qr["QR scanner<br/>[app.js]"]
end

subgraph group_media["Voice and security"]
  node_audio["Audio capture/playback<br/>[app.js]"]
  node_codec["Voice codec<br/>[codec.js]"]
  node_crypto["Channel crypto<br/>[crypto.js]"]
end

subgraph group_relay["Relay service"]
  node_relay_server["HTTP and WebSocket server<br/>[server.js]"]
  node_rooms["Room and PTT control<br/>[server.js]"]
  node_forwarding["Audio forwarding<br/>[server.js]"]
  node_health_static["Health and client hosting<br/>[server.js]"]
end

node_user(("Mobile user"))

node_user -->|"opens client"| node_interface
node_interface -.->|"boots application"| node_app
node_app -->|"opens scanner"| node_qr
node_app -->|"captures and plays"| node_audio
node_app -->|"encodes frames"| node_codec
node_app -->|"encrypts frames"| node_crypto
node_app -->|"opens WebSocket"| node_relay_server
node_app -->|"checks health"| node_health_static
node_relay_server -->|"dispatches control"| node_rooms
node_rooms -->|"authorizes talker"| node_forwarding
node_forwarding -->|"forwards encrypted audio"| node_app
node_rooms -->|"sends room events"| node_app
node_health_static -->|"serves client"| node_interface

click node_interface "https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/client/index.html"
click node_app "https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/client/app.js"
click node_qr "https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/client/app.js"
click node_audio "https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/client/app.js"
click node_codec "https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/client/codec.js"
click node_crypto "https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/client/crypto.js"
click node_relay_server "https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/server/server.js"
click node_rooms "https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/server/server.js"
click node_forwarding "https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/server/server.js"
click node_health_static "https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/server/server.js"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_interface,node_app,node_qr,node_user toneBlue
class node_audio,node_codec,node_crypto toneAmber
class node_relay_server,node_rooms,node_forwarding,node_health_static toneMint
```

## Components

### Mobile client

- [Web interface](https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/client/index.html): `client/index.html`
- [Client application](https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/client/app.js): `client/app.js`
- [QR scanner](https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/client/app.js): `client/app.js`

### Voice and security

- [Audio capture/playback](https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/client/app.js): `client/app.js`
- [Voice codec](https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/client/codec.js): `client/codec.js`
- [Channel crypto](https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/client/crypto.js): `client/crypto.js`

### Relay service

- [HTTP and WebSocket server](https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/server/server.js): `server/server.js`
- [Room and PTT control](https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/server/server.js): `server/server.js`
- [Audio forwarding](https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/server/server.js): `server/server.js`
- [Health and client hosting](https://github.com/developerkayitha2095-ops/ptt-walkie/blob/main/server/server.js): `server/server.js`

### Other components

- **Mobile user**

## Connections

- Mobile user → Web interface: opens client (evidence: `README.md`)
- Web interface → Client application: boots application
- Client application → QR scanner: opens scanner (evidence: `client/app.js`)
- Client application → Audio capture/playback: captures and plays (evidence: `client/app.js`)
- Client application → Voice codec: encodes frames (evidence: `client/app.js`)
- Client application → Channel crypto: encrypts frames (evidence: `client/app.js`)
- Client application → HTTP and WebSocket server: opens WebSocket (evidence: `client/app.js`)
- Client application → Health and client hosting: checks health (evidence: `README.md`)
- HTTP and WebSocket server → Room and PTT control: dispatches control (evidence: `server/server.js`)
- Room and PTT control → Audio forwarding: authorizes talker (evidence: `README.md`)
- Audio forwarding → Client application: forwards encrypted audio (evidence: `README.md`)
- Room and PTT control → Client application: sends room events (evidence: `README.md`)
- Health and client hosting → Web interface: serves client (evidence: `server/server.js`)