Function capsules::net::sixlowpan_compression::is_ip6_nh_compressible

fn is_ip6_nh_compressible(
    next_header: u8, 
    next_headers: &[u8]
) -> Result<(bool, u8), ()>

Determines if the next header is LoWPAN_NHC compressible, which depends on both the next header type and the length of the IPv6 next header extensions. Returns Ok((false, 0)) if the next header is not compressible or Ok((true, nh_len)). nh_len is only meaningful when the next header type is an IPv6 next header extension, in which case it is the number of bytes after the first two bytes in the IPv6 next header extension. Returns Err(()) in the case of an invalid IPv6 packet.