Modbus TCP Transaction IDs: Match Responses Across Timeouts and Reused IDs
Prevent late Modbus TCP replies from completing newer requests with connection-scoped IDs, quarantine and single-owner completion.
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Modbus Unit Identifiers and Broadcasts: Routing TCP Requests onto an RTU Bus
Define Unit Identifier routing, safe broadcast scope and truthful no-response handling when a TCP gateway drives an RTU bus.
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BLE L2CAP CoC or GATT for Bulk Data: Framing, Credits and Platform Support
Compare LE L2CAP CoC and GATT for bulk transfers through platform support, framing, backpressure and recoverable commit semantics.
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BLE ATT Error Responses: Separate Permissions, Authentication and Value Errors
Interpret ATT errors using opcode, handle and procedure context, separating permissions, security prerequisites and value failures.
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BLE Bond Storage Limits: Eviction, Factory Reset and Lost-Key Recovery
Define bond admission, finite storage, authorized eviction and one-sided key-loss recovery without weakening security.
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iOS Background BLE: State Restoration and the Limits of Background Discovery
Design event-driven iOS BLE recovery with stable restoration identifiers, app-owned operation journals and a real-device lifecycle test plan.
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Android BLE Permissions: Nearby Devices, Location and Scan Failure Diagnosis
Separate Android permission denial, scanner failures and missing advertisements with an OS-and-target-SDK matrix and a controlled acceptance sequence.
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BLE Scanning Reliability: Duplicate Filtering, RSSI Windows and Missed Advertisements
Separate radio reception, duplicate suppression, OS reporting and UI deduplication before judging BLE discovery latency, freshness or RSSI.
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BLE Advertising Payloads: Fit Device Identity into Legacy Advertising and Scan Responses
Allocate legacy BLE advertising and scan-response bytes separately, preserve first-packet discovery fields and validate names and AD structures at their boundaries.
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When Should an RTOS Feed the Watchdog? Task Health Checks and Fault-Injection Tests
Define task health, control watchdog feed authority, and test missed faults, false resets, safe outputs, and recovery with a fault-injection matrix.
