Since everyone who are into pcap analyses are looking, I cannot help but drop references to two other open source DPI products that are worth considering for some use cases.

The first one I authored myself many years ago and has been dormant for a long time although I'd certainly enjoy working on it again if an opportunity arises: https://github.com/rixed/junkie

The other one seems to stand in the same niche of highly specific, optimised programmable DPI, but I'm obviously much less familiar with it: https://github.com/DanieleDeSensi/peafowl