Thanks! That's good info. The hardest part was that in OTP 22 the examples given used many of the deprecated erl_* apis. I was able to update the C examples (see the second link) to use non-deprecated ei_* api calls. Mostly small changes and a bit better buffer management. Though, I don't like the lack of buffer length check in even the newer ei_encode_* functions. :/ I added a 24 byte padding guessing most single item encodes are less than that, and then check variable length items for size. Still hard to use safely without a buffer overrun. I'll take a look and see what else may have changed. It's exciting seeing all the continual beam improvements!