Example payload
{
"sensor": "temperature",
"value": 22.4,
"unit": "C"
}Hardware Demos
ESP32 / ESP8266 WiFi Direct
WiFi-capable microcontrollers connect directly to DataNet — no bridge computer needed.
Source-backedLocal setup requiredRequires hardwareSensor Scalar
What this demo proves
An ESP32 or ESP8266 can authenticate via HTTPS, open a secure WebSocket, and pub/sub canonical telemetry channels completely autonomously once flashed. This is the right path for standalone IoT devices and wireless installations.
Platforms
ESP32ESP8266Arduino IDE
Payload types
FloatJSON
Channel names
demo.scalar.temperatureStable telemetry channel for numeric sensor and script examples.Compatibility notes
Browser JavaScriptNative
Node.jsNative
PythonNative
p5.jsNative
ProcessingNative
ArduinoJSON wrapped
ESP32 / ESP8266Native
Serial bridgeAdapter required
TouchDesignerNot yet supported
Run online
- Flash-required — no online runnable. See the source files and README for wiring and library setup.
Run locally
- 1. Install the DataNet Arduino library (copy packages/sdk-arduino into Arduino libraries folder).
- 2. Install dependencies: ArduinoJson v7+ and WebSockets v2.4+ (Links2004) via Library Manager.
- 3. Open TemperatureSensor.ino, fill in WIFI_SSID, WIFI_PASSWORD, and DATANET_API_KEY.
- 4. Select your board (ESP32 Dev Module or NodeMCU/D1 Mini for ESP8266) and upload.
- 5. Open Serial Monitor at 115200 baud to watch connection status.
- 6. Subscribe from a browser playground or p5 sketch on the same channel.
Expected output
- Board connects to WiFi, POSTs to /auth/token, opens WSS connection.
- Publishes simulated temperature + humidity JSON every 5 seconds.
- Subscribes to a commands channel and prints received messages to Serial.
- Automatically reconnects with exponential backoff on disconnect.
Troubleshooting
- If auth fails, double-check DATANET_API_KEY and that the board has internet access.
- ESP8266 has ~80 KB heap — reduce DATANET_MAX_SUBS or DATANET_JWT_BUF_SIZE if you see memory errors.
- SSL certificate verification is disabled by default (setInsecure). See README for certificate pinning options.