geonetworking 0.2.0

Tools for encoding and decoding a geonetworking header according to EN 302 636-4-1 v1.3.1
Documentation
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#[cfg(feature = "validate")]
use std::env;

fn main() {
    #[cfg(feature = "validate")]
    if let Ok(v) = env::var("DEP_OPENSSL_VERSION_NUMBER") {
        let version = u64::from_str_radix(&v, 16).unwrap();

        if version < 0x3000_0000 {
            panic!("This crate supports openssl >= 3 only!")
        }
    }
}