# Version History

## 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