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Document changes for version 1.2.1

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Updated changelog for version 1.2.1 with detailed changes including stack size increase, pre-allocation of price vectors, and unified JSON sensor states.
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Amir
2026-04-08 01:05:09 +02:00
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CHANGELOG.md
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# EPrices – Changelog
## v1.2.1 — 2026-04-07
### ESP32 main task stack size increase
Increased the FreeRTOS main application task stack from the ESP-IDF default
of 8192 bytes to 16384 bytes. This eliminates the stack overflow scenario
that most likely caused the spontaneous reboot observed in production on
2026-04-06, where the FreeRTOS idle task faulted following memory pressure
during a simultaneous NVS load and HTTP fetch/parse cycle.
The 8 KB cost is well within the ESP32's 320 KB available RAM.
**Changed location in `eprices.yaml`:**
- `esp32: framework: sdkconfig_options:` — added
`CONFIG_ESP_MAIN_TASK_STACK_SIZE: "16384"`
---
### Price vector heap pre-allocation at boot
Pre-allocated capacity for all four price vectors at boot using `.reserve(96)`.
Previously, each vector started empty and grew incrementally on every NVS load
and HTTP fetch, triggering repeated heap reallocations and leaving the heap
fragmented before the first fetch cycle completed.
With capacity reserved upfront, no reallocation occurs during any subsequent
NVS load or HTTP parse operation. This reduces heap fragmentation and peak
allocation spikes, particularly during the boot sequence where NVS load and
the first HTTP fetch can overlap.
**Vectors pre-allocated:**
- `price_timestamps_today`
- `price_values_today`
- `price_timestamps_tomorrow`
- `price_values_tomorrow`
**Changed location in `eprices.yaml`:**
- `on_boot:` lambda — added `.reserve(96)` on all four price vectors
---
### Hourly JSON sensor cleared state unified with 15-min sensors
The two hourly JSON text sensors previously published `"[]"` when cleared
(at midnight bridge and on `clear_today_prices` / `clear_tomorrow_prices`).
The six 15-minute JSON sensors already published `""` in the same situation.
All eight JSON sensors now publish `""` when cleared, giving consistent
behaviour across the full sensor set.
**Affected sensors:**
- `Today JSON Hourly Prices EUR⁄kWh`
- `Tomorrow JSON Hourly Prices EUR⁄kWh`
**Changed locations in `eprices.yaml`:**
- `clear_today_prices` script — `"[]"` → `""`
- `clear_tomorrow_prices` script — `"[]"` → `""`
- `midnight_bridge_promotion` script — `"[]"` → `""` (where applicable)
---
## v1.2 — 2026-04-06
### HTTP fetch stuck-flag watchdog
@@ -179,10 +239,10 @@ eprices_vat_rate # e.g. "0.22" (VAT rate as decimal multiplier)
| Name | Entity ID | Notes |
|---|---|---|
| Today JSON Hourly Prices EUR⁄kWh | `sensor.eprices_today_json_hourly_prices_eur_kwh` | JSON array, 24 values |
| Today JSON 15-Min Prices EUR⁄kWh (P1 00:00-07:45) | `sensor.eprices_today_json_15_min_prices_eur_kwh_p1_00_00_07_45` | JSON array, 32 values |
| Today JSON 15-Min Prices EUR⁄kWh (P2 08:00-15:45) | `sensor.eprices_today_json_15_min_prices_eur_kwh_p2_08_00_15_45` | JSON array, 32 values |
| Today JSON 15-Min Prices EUR⁄kWh (P3 16:00-23:45) | `sensor.eprices_today_json_15_min_prices_eur_kwh_p3_16_00_23_45` | JSON array, 32 values |
| Today JSON Hourly Prices EUR⁄kWh | `sensor.eprices_today_json_hourly_prices_eur_kwh` | JSON array, 24 values; `""` when no data |
| Today JSON 15-Min Prices EUR⁄kWh (P1 00:00-07:45) | `sensor.eprices_today_json_15_min_prices_eur_kwh_p1_00_00_07_45` | JSON array, 32 values; `""` when no data |
| Today JSON 15-Min Prices EUR⁄kWh (P2 08:00-15:45) | `sensor.eprices_today_json_15_min_prices_eur_kwh_p2_08_00_15_45` | JSON array, 32 values; `""` when no data |
| Today JSON 15-Min Prices EUR⁄kWh (P3 16:00-23:45) | `sensor.eprices_today_json_15_min_prices_eur_kwh_p3_16_00_23_45` | JSON array, 32 values; `""` when no data |
| Today Highest Price Time | `sensor.eprices_today_highest_price_time` | HH:MM |
| Today Lowest Price Time | `sensor.eprices_today_lowest_price_time` | HH:MM |
| Today Highest Hourly Price Time | `sensor.eprices_today_highest_hourly_price_time` | HH:00 |
@@ -194,10 +254,10 @@ eprices_vat_rate # e.g. "0.22" (VAT rate as decimal multiplier)
| Today Price Update Status Message | `sensor.eprices_today_price_update_status_message` | Detailed status string; diagnostic |
| Today API Fetch Attempts | `sensor.eprices_today_api_fetch_attempts` | HTTP fetch count; resets at midnight; diagnostic |
| Today Entry Count | `sensor.eprices_today_entry_count` | Number of stored price points; diagnostic |
| Tomorrow JSON Hourly Prices EUR⁄kWh | `sensor.eprices_tomorrow_json_hourly_prices_eur_kwh` | JSON array, 24 values |
| Tomorrow JSON 15-Min Prices EUR⁄kWh (P1 00:00-07:45) | `sensor.eprices_tomorrow_json_15_min_prices_eur_kwh_p1_00_00_07_45` | JSON array, 32 values |
| Tomorrow JSON 15-Min Prices EUR⁄kWh (P2 08:00-15:45) | `sensor.eprices_tomorrow_json_15_min_prices_eur_kwh_p2_08_00_15_45` | JSON array, 32 values |
| Tomorrow JSON 15-Min Prices EUR⁄kWh (P3 16:00-23:45) | `sensor.eprices_tomorrow_json_15_min_prices_eur_kwh_p3_16_00_23_45` | JSON array, 32 values |
| Tomorrow JSON Hourly Prices EUR⁄kWh | `sensor.eprices_tomorrow_json_hourly_prices_eur_kwh` | JSON array, 24 values; `""` when no data |
| Tomorrow JSON 15-Min Prices EUR⁄kWh (P1 00:00-07:45) | `sensor.eprices_tomorrow_json_15_min_prices_eur_kwh_p1_00_00_07_45` | JSON array, 32 values; `""` when no data |
| Tomorrow JSON 15-Min Prices EUR⁄kWh (P2 08:00-15:45) | `sensor.eprices_tomorrow_json_15_min_prices_eur_kwh_p2_08_00_15_45` | JSON array, 32 values; `""` when no data |
| Tomorrow JSON 15-Min Prices EUR⁄kWh (P3 16:00-23:45) | `sensor.eprices_tomorrow_json_15_min_prices_eur_kwh_p3_16_00_23_45` | JSON array, 32 values; `""` when no data |
| Tomorrow Highest Price Time | `sensor.eprices_tomorrow_highest_price_time` | HH:MM |
| Tomorrow Lowest Price Time | `sensor.eprices_tomorrow_lowest_price_time` | HH:MM |
| Tomorrow Highest Hourly Price Time | `sensor.eprices_tomorrow_highest_hourly_price_time` | HH:00 |
@@ -238,3 +298,4 @@ eprices_vat_rate # e.g. "0.22" (VAT rate as decimal multiplier)
- **API fetch times** reset to `Never` at midnight bridge and on `clear_tomorrow_prices`
- **API fetch attempt counters** reset to `0` at midnight and publish `0` immediately on boot
- **Uptime** displayed as human-readable string: `45 s` / `5 min` / `3 h 22 min` / `12 d 4 h` / `4 months 12 d`
- **JSON sensors** publish `""` (empty string) when no data is available — all eight JSON sensors behave consistently