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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

Recognizing at-least-once delivery and making a receiver safe against duplicates with message IDs

taught

Taught in

Requires

Required by

Local knowledge map

Local knowledge map

Comparing local-only, self-hosted, managed-cloud and… Confirming, auditing and undoing commands sent from a dashboard Querying device history with time windows, aggregates… Splitting an IoT back end into ingest, state, API and jobs,… Writing a device test plan covering function, environment… Ingesting telemetry from a broker into a store with validation… Sending a command over pub/sub and matching its acknowledgement… Testing connected firmware and back ends under loss, latency… Recognizing at-least-once delivery and making a receiver… Choosing MQTT QoS 0, 1 or 2 by what each guarantees and costs,… Choosing a relational table, a time-series database or a documen… Choosing clean or persistent sessions and reasoning about… Classifying a message as telemetry, a command or state, and… Deciding between a gateway and direct-to-cloud… Getting wall-clock time onto a device with NTP, timestampin… Buffering readings in a bounded offline queue with a drop… Passing data from an ISR to a task with a single-producer… Scheduling reconnect attempts with exponential backoff,…

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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.