Suggestion:

I've noticed that in bright sunlight, the values max out at 65K. According to the spec sheet: "By default, the measurement parameters are optimized for indoor ambient light levels where it is possible to detect light levels as low as 6 lx. For operation under direct sunlight, the ADC can be programmed to operate in a high signal operation so that it is possible to measure direct sunlight without overflowing the 16-bit result."

Given the use case for this sensor (in space), shouldn't the default be "high signal operation". Or should it switch automatically once the value maxes out? (I'm not sure if this is desirable, since it makes the absolute values a bit more difficult to compare. Or perhaps the code adjusts and returns the value as a scaled 32 bit result.)

I realize you have better things to do with your spare time and I'm willing to take on this assignment should you so desire. Please comment.

Minor bug in payload_decoders.js:

ir and visible returned as SignedInts, thus resulting as negative values in bright sunlight.
They should be converted as unsigned ints.

I fixed it by adding a convertTwoBytesToUnsignedInt function:

function convertTwoBytesToUnsignedInt( highByte, lowByte ) {
var x = (((highByte & 0xFF) << 8) | (lowByte & 0xFF));
return x;
}

You should enclose the implementation of
uint8_t BME680Sensor::handleCommand(uint16_t cmdSequenceID, uint8_t command, uint8_t* recievedData, uint8_t recievedDataLen)

with

#ifdef ENABLE_AMBASAT_COMMANDS

in BME680Sensor.cpp
since also the declaration is conditional
i would make a pull request on this, but last time didn't work very well and now my fork is even farther from yours so i tought i'd point it out here...

Hi Michael,
The mentioned bug in Si1132Sensor::setIsInfraRedHighSignalRange(bool setting) is:

_highSignalVisible = setting;

while the function is supposed to set

_highSignalInfraRed = setting;