Function readLine

src/fl/stl/cstdio.cpp.hpp:185–206

}

fl::optional<fl::string> readLine(char delimiter, char skipChar, fl::optional<u32> timeoutMs) {
    // Try platform-native line reading first (e.g., Arduino's Serial.readStringUntil).
    // This is critical for USB CDC platforms (ESP32-C6/S3) where the native
    // implementation uses yield() (immediate context switch) instead of
    // delay(1) (1ms FreeRTOS sleep), enabling correct multi-packet assembly.
    char nativeBuf[512];
    int nativeLen = platforms::readLineNative(delimiter, nativeBuf, sizeof(nativeBuf));
    if (nativeLen >= 0) {
        fl::string result(nativeBuf, nativeLen);
        return fl::string(result.trim());
    }

    // Fallback: character-by-character reading for non-Arduino platforms
    sstream buffer;
    if (!readStringUntil(buffer, delimiter, skipChar, timeoutMs)) {
        return fl::nullopt;  // Timeout occurred
    }

    // Convert to string and trim whitespace (trim() returns a new fl::string)
    fl::string result = buffer.str();
    return fl::string(result.trim());
}

bool flush(u32 timeoutMs) {
#ifdef FASTLED_TESTING