Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

iot

Choosing between polling an HTTP endpoint and a long-lived WebSocket for two-way updates

taught

Taught in

WebSockets
Connected Devices and the Internet of Things

Requires

http-request-anatomy required

Required by

Choosing between HTTP, MQTT and WebSockets by direction, overhead, battery and firewalls required
Pushing live device updates to a browser with server-sent events or WebSockets required

Local knowledge map

Local knowledge map

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Solid arrows are required prerequisites; dashed are recommended or helpful. Lower rows are more foundational. Click any box to jump to that concept.