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

📬

MQTT Delivery Mastery

Packets per hop after the QoS downgrade, keepalive deadlines and ping counts. Five in a row.

🎯 5 in a row 🚫 no clock

▶ Log in to play

← Back to the arcade