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J. Nick Koston
85e818dda7
The API protobuf write path uses a shared buffer that gets resize()'d on every message send. std::vector::resize() zero-fills new bytes, but every byte is overwritten by the encoder before being read. For a 16-advertisement BLE proxy batch, this wastes ~1300 bytes of memset per flush (~10x/second). ProtoByteBuffer is a minimal replacement that skips zero-initialization on resize(). On ESP32/RP2040/LibreTiny it also skips zero-fill on allocation via make_unique_for_overwrite. On ESP8266 it falls back to make_unique (zero-fills on alloc, but resize still doesn't zero-fill — the main win is preserved since reserve is typically a no-op after warmup).
