# Version History

## 0.5.0 (2026-06-04)

Decoding accuracy fixes (thanks to community bug reports from Karsten, Cory, Kevin and Dan)
plus new AC Charger support. Field layouts verified against the keshavdv/victron-ble
reference implementation and the Victron "Extra Manufacturer Data" specification.

### Bug fixes
- **Battery monitor decoding rewritten.** The `victronBatteryMonitorPayload` struct had
  wrong field widths (8-bit alarm instead of 16, no 2-bit aux-mode field) which cascaded
  and misaligned current, consumed Ah and SOC. `parseBatteryMonitor()` now decodes the
  bit-packed payload directly by bit offset: signed voltage, 16-bit alarm, aux value +
  2-bit aux mode (replacing the unreliable `< 3000` voltage/temperature heuristic),
  22-bit signed current, 20-bit consumed Ah (×-0.1 Ah), 10-bit SOC (×0.1 %).
- **Solar charger battery current scale fixed.** Was multiplied by 0.01 (10× too small);
  the field is in 0.1 A units. Load current is now read as the correct 9-bit field.
- **Compile error with newer ESP32 BLE library fixed.** `getManufacturerData()` now returns
  an Arduino `String` on recent cores; `processDevice()` handles both `String` and
  `std::string` while preserving the binary payload's embedded null bytes.
- **Device type IDs corrected.** The enum was off-by-one from 0x07 onward, mislabelling
  AC chargers (0x08) as Lynx Smart BMS. Now matches the Victron protocol:
  0x07 GX Device, 0x08 AC Charger, 0x09 Smart Battery Protect, 0x0A Lynx Smart BMS,
  0x0B Multi RS, 0x0C VE.Bus, 0x0D DC Energy Meter, 0x0F Orion XS.

### New features
- **AC Charger support** (Blue Smart IP22/IP65/IP67, device type 0x08). New
  `VictronACChargerData` struct (three output voltage/current banks, temperature, AC
  current) and `DEVICE_TYPE_AC_CHARGER` handling.

## 0.4.1 (2026-02-28)

Major rework of library internals. Breaking API change — not backwards compatible with 0.3.x.

### Callback API rewrite
- Replaced virtual callback class (`VictronDeviceCallback` with 4 override methods) with a
  single function pointer (`VictronCallback`). Users now provide a plain function instead of
  subclassing. The callback receives a `VictronDevice*` and switches on `deviceType` to access
  the appropriate data via a tagged union.

### Non-blocking BLE scanning
- `loop()` is now non-blocking — returns immediately if a scan is already running.
  Previously it blocked for the entire scan duration (default 5 seconds).
- Scan restarts automatically when it completes.

### Callback throttling
- Nonce-based deduplication: skips decrypt/parse/callback when the device's data hasn't
  changed (detected via the nonce field in the BLE advertisement header).
- Configurable minimum interval (`setMinInterval()`, default 1000ms) limits callback
  frequency even when data is changing rapidly.
- Encryption key byte check before AES decryption for early rejection of mismatched keys.

### Memory and code reduction
- Replaced `std::map<String, DeviceInfo*>` with a fixed array (max 8 devices, linear search).
  Eliminates heap allocation for device storage.
- Replaced Arduino `String` with fixed `char[]` arrays throughout (MAC: 12 chars, name: 32 chars).
  Eliminates heap fragmentation from dynamic string operations.
- Replaced inheritance hierarchy (`VictronDeviceData` base + 4 derived classes) with a flat
  `VictronDevice` struct using a tagged union. No more `new`/`delete` for device data.
- Removed `std::map` and `std::vector` includes entirely.
- Source reduced from ~970 lines to ~510 lines (48% reduction).
- Flash savings: ~11-14 KB across examples.

### Bug fixes
- Fixed undefined behavior: derived objects were deleted through a base pointer without a
  virtual destructor. Now uses flat structs, no polymorphic delete.
- Removed incorrect `panelVoltage` calculation (was dividing PV power by battery current,
  which is wrong for MPPT chargers). The BLE protocol does not transmit PV voltage.
- Removed spurious `nullPad` byte from manufacturer data struct.
- Device type is now auto-detected from the BLE advertisement record type. The type
  parameter in `addDevice()` is optional.

### Removed features (commented out in header for reference)
- `VictronDeviceConfig` struct — use `addDevice(name, mac, key, type)` directly
- Per-type getter methods (`getSolarChargerData()`, etc.) — use callback instead
- `removeDevice()`, `getDevicesByType()`, `getLastError()`

### Examples updated
- All examples updated for new callback API
- Removed `panelVoltage` from ESPNow packet structs (Repeater, FakeRepeater, Receiver)
- Removed unnecessary `delay(100)` from loop functions
- Added ESPNow Repeater and Receiver examples

## 0.3.1 (2026-02-11)

### Changes
- Added Logger example: change-detection logging for Solar Charger data
- Added message type counters to MultiDevice example
- Tested with MPPT Solar Chargers on ESP32-S3 and ESP32-C3

## 0.1.1 (2025-12-18)

Initial release - not yet tested on hardware.

### Features
- Support for multiple Victron device types:
  - Solar Chargers (MPPT)
  - Battery Monitors (SmartShunt, BMV)
  - Inverters (MultiPlus, Quattro, Phoenix with VE.Bus BLE)
  - DC-DC Converters (Orion Smart, Orion XS)
- BLE advertisement decryption using AES-128-CTR
- Callback interface for real-time data updates
- Manual data polling API
- Support for multiple simultaneous devices
- Debug logging
- Framework agnostic (Arduino and ESP-IDF)

### Known Issues
- Not yet tested with real hardware
- No validation against actual Victron devices

### TODO
- Hardware testing with real Victron devices
- Add more device types (Smart Battery Protect, Lynx Smart BMS, etc.)
- Add more examples
- Performance optimization
- Add unit tests