Wi-Fi Power Save and DTIM: Diagnosing Delayed Downlink Commands
Trace first-command latency across AP buffering, DTIM and client sleep policy, then measure energy and responsiveness together.
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Embedded Wi-Fi Roaming: BSSID Selection, Hysteresis and Connection Continuity
Design roaming decisions around fresh BSSID candidates, hysteresis and application continuity, with explicit k/v/r boundaries.
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WPA Personal Credentials: Passphrases, Raw PSKs and Validation Before Association
Keep WPA-PSK passphrases and raw keys distinct, map each backend correctly, and reject input errors before association.
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SSID Bytes and Unicode: Preventing Wi-Fi Setup Failures with Non-ASCII Network Names
Preserve SSID bytes through scanning, Unicode display, provisioning transport and persistence, with reproducible boundary fixtures.
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Wi-Fi Country Codes and Channel Availability: Why a Device Cannot See an Access Point
Compare deployment region, per-PHY channel flags and AP settings to explain why an embedded device cannot discover a network.
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Hidden SSIDs in IoT Onboarding: Scan Results, Directed Probes and User Input
Diagnose missing hidden SSIDs with scan evidence, exact manual input, bounded directed probes and channel-aware validation.
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RTOS Memory Protection: Define User-Task Boundaries with Zephyr Memory Domains
Define user-task memory partitions, object grants and negative tests without overstating MPU isolation.
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Zephyr Workqueues: Cancel, Reschedule and Drain Without Racing the Handler
Close submission races before synchronous cancellation, and distinguish delayable work from queue drain.
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Suspending an RTOS Task That Holds a Mutex: Deadlock Risks and Safer Pause Protocols
Diagnose held-mutex stalls, non-counted suspension and early-resume races using exact FreeRTOS scheduling semantics.
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RTOS C Library Reentrancy: errno, stdio Locks and Per-Task State
Audit per-task errno, recursive allocator locks, stream locking and shutdown against the linked C runtime.
