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fix(firmware): enable CSI in sdkconfig and add build guard (ADR-057)
The committed sdkconfig had CONFIG_ESP_WIFI_CSI_ENABLED disabled, causing all builds to crash at runtime with "CSI not enabled in menuconfig". Root cause: sdkconfig.defaults.template existed but ESP-IDF only reads sdkconfig.defaults (no .template suffix). Fixes: - Add sdkconfig.defaults with CONFIG_ESP_WIFI_CSI_ENABLED=y - Add #error compile guard in csi_collector.c to prevent recurrence - Fix NVS encryption default (requires eFuse, breaks clean builds) Verified: Docker build + flash to ESP32-S3 + CSI callbacks confirmed. Closes #241 Relates to #223, #238, #234, #210, #190 Co-Authored-By: claude-flow <[email protected]>
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‎docs/adr/ADR-057-firmware-csi-build-guard.md‎

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# ADR-057: Firmware CSI Build Guard and sdkconfig.defaults
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| Field | Value |
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|-------------|---------------------------------------------|
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| **Status** | Accepted |
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| **Date** | 2026-03-12 |
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| **Authors** | ruv |
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| **Issues** | #223, #238, #234, #210, #190 |
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## Context
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Multiple GitHub issues (#223, #238, #234, #210, #190) report firmware problems
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that fall into two categories:
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1. **CSI not enabled at runtime** — The committed `sdkconfig` had
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`# CONFIG_ESP_WIFI_CSI_ENABLED is not set` (line 1135), meaning users who
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built from source or used pre-built binaries got the runtime error:
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`E (6700) wifi:CSI not enabled in menuconfig!`
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Root cause: `sdkconfig.defaults.template` existed with the correct setting
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(`CONFIG_ESP_WIFI_CSI_ENABLED=y`) but ESP-IDF only reads
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`sdkconfig.defaults` — not `.template` suffixed files. No `sdkconfig.defaults`
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file was committed.
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2. **Unsupported ESP32 variants** — Users attempting to use original ESP32
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(D0WD) and ESP32-C3 boards. The firmware targets ESP32-S3 only
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(`CONFIG_IDF_TARGET="esp32s3"`, Xtensa architecture) and this was not
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surfaced clearly enough in documentation or build errors.
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## Decision
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### Fix 1: Commit `sdkconfig.defaults` (not just template)
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Copy `sdkconfig.defaults.template` → `sdkconfig.defaults` so that ESP-IDF
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applies the correct defaults (including `CONFIG_ESP_WIFI_CSI_ENABLED=y`)
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automatically when `sdkconfig` is regenerated.
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### Fix 2: `#error` compile-time guard in `csi_collector.c`
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Add a preprocessor guard:
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```c
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#ifndef CONFIG_ESP_WIFI_CSI_ENABLED
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#error "CONFIG_ESP_WIFI_CSI_ENABLED must be set in sdkconfig."
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#endif
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```
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This turns a confusing runtime crash into a clear compile-time error with
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instructions on how to fix it.
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### Fix 3: Fix committed `sdkconfig`
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Change line 1135 from `# CONFIG_ESP_WIFI_CSI_ENABLED is not set` to
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`CONFIG_ESP_WIFI_CSI_ENABLED=y`.
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## Consequences
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- **Positive**: New builds will always have CSI enabled. Users building from
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source will get a clear compile error if CSI is somehow disabled.
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- **Positive**: Pre-built release binaries will include CSI support.
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- **Neutral**: Original ESP32 and ESP32-C3 remain unsupported. This is by
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design — only ESP32-S3 has the CSI API surface we depend on. Future ADRs
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may address multi-target support if demand warrants it.
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- **Negative**: None identified.
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## Hardware Support Matrix
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| Variant | CSI Support | Firmware Target | Status |
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|--------------|-------------|-----------------|---------------|
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| ESP32-S3 | Yes | Yes | Supported |
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| ESP32 (orig) | Partial | No | Unsupported |
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| ESP32-C3 | Yes (IDF 5.1+) | No | Unsupported |
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| ESP32-C6 | Yes | No | Unsupported |
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## Notes
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- ESP32-C3 and C6 use RISC-V architecture; a separate build target
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(`idf.py set-target esp32c3`) would be needed.
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- Original ESP32 has limited CSI (no STBC HT-LTF2, fewer subcarriers).
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- Users on unsupported hardware can still write custom firmware using the
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ADR-018 binary frame format (magic `0xC5110001`) for interop with the
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Rust aggregator.

‎firmware/esp32-csi-node/main/csi_collector.c‎

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#include "esp_timer.h"
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#include "sdkconfig.h"
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/* ADR-057: Build-time guard — fail early if CSI is not enabled in sdkconfig.
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* Without this, the firmware compiles but crashes at runtime with:
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* "E (xxxx) wifi:CSI not enabled in menuconfig!"
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* which is confusing for users flashing pre-built binaries. */
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#ifndef CONFIG_ESP_WIFI_CSI_ENABLED
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#error "CONFIG_ESP_WIFI_CSI_ENABLED must be set in sdkconfig. " \
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"Run: idf.py menuconfig -> Component config -> Wi-Fi -> Enable WiFi CSI, " \
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"or copy sdkconfig.defaults.template to sdkconfig.defaults before building."
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#endif
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static const char *TAG = "csi_collector";
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static uint32_t s_sequence = 0;

‎firmware/esp32-csi-node/sdkconfig.defaults‎

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# ESP32-S3 CSI Node — Default SDK Configuration
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# This file is applied automatically by idf.py when no sdkconfig exists.
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# Target: ESP32-S3
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CONFIG_IDF_TARGET="esp32s3"
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# Use custom partition table (8MB flash with OTA — ADR-045)
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CONFIG_PARTITION_TABLE_CUSTOM=y
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CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="partitions_display.csv"
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# Flash configuration: 8MB (Quad SPI)
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CONFIG_ESPTOOLPY_FLASHSIZE_8MB=y
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CONFIG_ESPTOOLPY_FLASHSIZE="8MB"
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# Compiler optimization: optimize for size to reduce binary
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CONFIG_COMPILER_OPTIMIZATION_SIZE=y
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# Enable CSI (Channel State Information) in WiFi driver
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CONFIG_ESP_WIFI_CSI_ENABLED=y
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# NVS encryption disabled by default (requires eFuse provisioning).
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# Enable only after burning HMAC key to eFuse block.
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# CONFIG_NVS_ENCRYPTION is not set
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# Disable unused features to reduce binary size
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CONFIG_BOOTLOADER_LOG_LEVEL_WARN=y
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CONFIG_LOG_DEFAULT_LEVEL_INFO=y
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# LWIP: enable extended socket options for UDP multicast
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CONFIG_LWIP_SO_RCVBUF=y
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# FreeRTOS: increase task stack for CSI processing
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CONFIG_ESP_MAIN_TASK_STACK_SIZE=8192

‎firmware/esp32-csi-node/sdkconfig.defaults.template‎

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# Enable CSI (Channel State Information) in WiFi driver
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CONFIG_ESP_WIFI_CSI_ENABLED=y
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# Enable NVS encryption for secure credential storage
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CONFIG_NVS_ENCRYPTION=y
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# NVS encryption disabled by default (requires eFuse provisioning).
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# Enable only after burning HMAC key to eFuse block.
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# CONFIG_NVS_ENCRYPTION is not set
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# Disable unused features to reduce binary size
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CONFIG_BOOTLOADER_LOG_LEVEL_WARN=y

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