The space I was in was IoT type items. Usually hub controllers. The thing is that is getting less and less as you can get a fairly robust thing now with a couple hundred meg of flash and ram for a very reasonable price. So those 'must fit in 32k' items are few and far between these days. With that sort of space you may as well use the proper libs that are usually nicely documented and all the quirks have been seen by hundreds of other poor souls such as yourself.