ZenAir is a professional JavaScript-driven tool for communication with microcontrollers (Arduino, ESP8266, ESP32) and IoT devices via Wi-Fi, MQTT, Bluetooth, USB Serial and HTTP (including SSE token streaming ability).

Connect your serial device, ESP32 or Raspberry Pi, send and receive data, build interactive control panels, and automate logic — all from your Android device.

━━━ WHY ZENAIR ━━━

— No Ads. No paid features. No telemetry
— Works completely offline and locally
— Multiple connections per terminal: up to 5 simultaneous links (Wi-Fi, BT, MQTT, HTTP, etc.) with simultaneous message broadcasting
— JavaScript runtime engine: transform, filter, and react to incoming data in real time
— Placeholder Resolver: embed dynamic commands into messages ($js, $send, $file, $itemField push notification trigger, and more)
— User File: write and read any data to application storage by one $file command
— SSDP Locator: auto-discover IoT devices on your local Wi-Fi and load terminals embedded in your microcontroller
— Grid Terminal: freely place UI elements on screen, configure layout with an editor. Adapts to any screen size
— Import/Export terminals between devices via file, text, or Data Matrix (QR-like) image
— Copy/paste items between terminals and share out via JSON
— Encryption export: AES-256-GCM with PBKDF2 key derivation
— Fullscreen Terminal view mode
— Ability to choose background image for Terminal
— background animations & 9 color themes with auto theme switching system based on a configured time schedule
— Unique timestamps: Delta from last message, Relative, Human-style and etc
— Auto Connect, Auto Reconnect, Background operation
— Autosave with adjustable rate
— Keep-screen-on mode
— Line-keeping: in moving console keeps the line which you stay on

━━━ CONTROL ELEMENTS ━━━

11 interactive items available in Grid Terminal:
Button, Switch, Slider, Joystick, State,
Text Log, Text Field, Linear Chart, Color Picker,
Nested Grid (dynamic UI construction via JSON),
JavaScript Ticker (timer-based execution & external triggers).

━━━ TERMINALS ━━━

All connected devices are represented as Terminals.
Two terminal types are available:

GRID — drag-and-drop canvas where you place and configure
items freely. Supports editor mode, per-element MQTT topics,
remote configuration from your microcontroller, and dynamic
UI creation/deletion via the Nested Grid meta-item.

CLASSIC — streamlined interface with console, history,
sliders (up to 16), and buttons (up to 60).

━━━ LINEAR CHART ━━━

High-performance chart item engineered for real-time IoT data:
— Up to 8000 data points
— Multiple view modes: Line, Point, Column, Area, Delta
— JavaScript-powered data and label transformation
— Day/Night indicator line for data points

━━━ OPEN & FREE ━━━

ZenAir is distributed completely free with no hidden purchases.
Change logs and privacy policy available on GitHub.