Add UNIT_OF_MEASUREMENT_MAX_LENGTH = 63 constant in core/config.py
and enforce it in sensor and number component validators.
Annotate unit_of_measurement proto fields with (max_data_length) = 63
so the codegen emits constant-size length varint calculations.
Replace 3-call sequence (write_raw_byte + write_raw_byte + encode_raw)
with single inlined encode_raw_short_string call for forced string
fields with max_data_length < 128. The compiler can hoist the pos
pointer across all three writes in one function boundary.
Add max_data_length field option for string/bytes fields. When
max_data_length < 128, the codegen emits constant-size length varint
calculations and direct byte writes.
Annotate all entity name and object_id fields with
(max_data_length) = 120 and (force) = true across all 25
ListEntities*Response messages (50 fields).
Generated code changes:
- calculate_size: `calc_length(1, size)` -> `2 + size` (constant)
- encode: `encode_string(N, ref)` -> `write_raw_byte(tag) + write_raw_byte(len) + encode_raw(data, len)`
Eliminates 2 function calls per field per entity list response,
removes zero-check branches, and removes varint size computation.
Refactor the constant-size varint pattern into a reusable helper
method on the TypeInfo base class, used by both UInt32Type (max_value)
and FixedArrayBytesType (fixed_array_size < 128).
Add a max_value field option to api_options.proto that tells the code
generator the maximum value a field can have. When max_value < 128,
the generated calculate_size() uses constant arithmetic instead of
calling varint size functions, and encode() uses direct byte writes
instead of varint encoding.
Also optimize FixedArrayBytesType: when fixed_array_size < 128, the
length varint is always 1 byte, so calculate_size() uses constant
arithmetic and encode() uses write_raw_byte for the length.
Applied to BluetoothLERawAdvertisement.address_type (max_value=4).
Measured on ESP32 (upstairsdesk89proxy):
- BluetoothLERawAdvertisement::calculate_size: 88 → 71 bytes (-19%)
- BluetoothLERawAdvertisement::encode: 199 → 179 bytes (-10%)
- Total BLE proxy hot path: 1807 → 1770 bytes (-37 bytes)
Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>
Co-authored-by: J. Nick Koston <nick+github@koston.org>
Co-authored-by: J. Nick Koston <nick@koston.org>
J. Nick Koston