It seems the example was either for a Board built by M5Stack containing the MLX90640 which could be
found on aliexpress, but is not available right now, or there are also indications that it was used with the
Sparkfun Qwiic board, which they say has pull-ups for SDA and SCL. So I have to see if I put in some
pull-ups and try the M5Stack (or any of the other esp32 boards I tried, which don’t seem to work without
pull-ups) or use an esp8266 (maybe the Huzzah and a LCD wing). In the end is probably a question of
CPU speed needed and overcoming the esp32 I2C issues, which seem to be more than just the pull-ups
from what I could find.