# OpenXC Message Format Specification
-Version: v0.4-dev
+Version: v0.6.0
This specification is a part of the [OpenXC platform][OpenXC].
The binary format is best if you need to maximize the amount of data that can be
sent from the VI, trading off flexibility for efficiency.
+## Message Pack
+MessagePack is an efficient binary serialization format. It lets you exchange data
+among multiple languages like JSON, but it's faster and smaller. Small integers are
+encoded into a single byte, and typical short strings require only one extra byte
+in addition to the strings themselves
+
+For protocol specification visit:
+https://github.com/msgpack/msgpack/blob/master/spec.md
+
+We are using the following lib:
+https://github.com/camgunz/cmp
+
+MessagePack provides a binary alternative to ProtoBuf. There are pros & cons to each
+so you can decide what works best for your project.
+
## Trace File Format
An OpenXC vehicle trace file is a plaintext file that contains JSON objects,