Wireless stacks: interview prep

Interview questions

Key points for each answer are in the app's question bank.

1. Explain BLE advertising and connections.Basic
2. What are GATT services and characteristics?Basic
3. How do BLE connection interval, latency and supervision timeout trade off?Intermediate
4. Explain BLE pairing, bonding and security levels.Intermediate
5. Compare ways to provision Wi-Fi credentials on a headless device.Intermediate
6. What are MQTT QoS levels 0, 1 and 2?Basic
7. Compare Thread, Zigbee and Matter.Intermediate
8. What determines radio range? Explain a link budget.Intermediate
9. Design firmware update over BLE so a dropped connection never bricks the device.Advanced
10. TCP or UDP for an IoT sensor: how do you decide?Intermediate
11. BLE and Wi-Fi share one antenna and throughput collapses. What do you check?Intermediate
12. What is RSSI, and why is it a poor distance measure?Basic

Hands-on challenges

Design rounds

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