I’m pretty sure this is a straightforward question concerning the Arduino API under RUI3 (on RAK4631)
AFAIK Wire.requestFrom(len) implements a multibyte I2C bus read into an internal buffer that is then accessed by single byte reads using Wire.available() and Wire.read().
The official Arduino reference doco states that the Wire implementation uses a 32 byte buffer.
Is the same sized buffer used under the hood in RUI3?
I’m polling UBX formatted data out of the RAK12500 GNSS. For some UBX payloads I’ll have to loop over several blocks anyway, but it’s more efficient if the blocks are larger.