If you're in trouble and cannot find an answer to a question which goes beyond Stack Overflow...
If you have a not-so-usual solution for your problems but need to justify it to your boss...
If you like to think on your own rather than blindly follow "common wisdom" and "profound truth"...
...then 'No Bugs' Hare on Soft.ware might be the right place for you.
Your mileage may vary. Batteries not included

Assorted Rants Tagged ‘IDL’, page 1:

Bot Fighting 201. Part 4. Obfuscating Protocols. Versioning.

Quote: “we can handle several Client versions (each with its own obfuscation) with the very same Server.”
Another Quote: “Then, if/when a zero-day bug is encountered in TLS – our obfuscation does provide additional protection even before the attacker can reach the code with that zero-day vulnerability”

Marshalling and Encodings

Quote: “Encoded data size is especially important for Client-Server communications, and less important (within reason) for Server-to-Server ones and for locally-stored format.”
Another Quote: “On the other hand, due to being optimized for CPU operation, Flatbuffers are NOT optimized space-wise; even compared to not-so-optimal-space-wise Google Protocol Buffers, Flatbuffers can lose additional 1.5x in size”

Avoiding ugly afterthoughts. Part b. Coding for Security, Coding for i18n, Testing as a Part of Development

Quote: “Doing sanitization at IDL level automates quite a bit of tedious-and-error-prone work, which is always a Good Thing™”
Another Quote: “Hey, this whole thing can be made MUCH simpler, the only thing we need to acknowledge is that the best identifier for a string is the string itself!”

Unity 5 vs UE4 vs Photon vs DIY for MMO

Quote: “You can still use HLAPI despite its shortcomings”
Another Quote: “If you’re using one of the engines above (and not your own one), and your game requires Client-Driven Development Flow, you may want to start with a single-player Unity 5, or with a single-player UE4.”

IDL: Encodings, Mappings, and Backward Compatibility

Quote: “Modifying generated code usually qualifies as a Really Bad Idea”
Another Quote: “How much can be gained by each of such specialized encodings – still depends on the game, but if you can try-and-test a dozen of different encodings within a few hours – it will usually allow you to learn quite a few things about your traffic (and to optimize things both visually and traffic-wise too).”