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iot

Getting wall-clock time onto a device with NTP, timestamping readings, and handling the time before sync

taught

Taught in

Requires

Required by

Local knowledge map

Local knowledge map

Choosing a relational table, a time-series database or a documen… Modelling telemetry as timestamped points with tags and fields,… Getting wall-clock time onto a device with NTP, timestampin… Building and parsing JSON on a microcontroller with… Choosing clean or persistent sessions and reasoning about… Deciding between a gateway and direct-to-cloud… Measuring and budgeting latency, throughput and loss… Reading CoAP requests and responses -- confirmable messages,… Recognizing at-least-once delivery and making a receiver… Sending messages between ESP32s with ESP-NOW, without an… Buffering readings in a bounded offline queue with a drop… Describing UDP datagrams, their size limits, and what UDP… Addressing a program with a port and a socket, and reading… 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.