Constant SSDP_SEARCH_PAYLOAD

pub const SSDP_SEARCH_PAYLOAD: &'static str = "\
            M-SEARCH * HTTP/1.1\n\
            Host: 239.255.255.250:1900\n\
            Man: \"ssdp:discover\"\n\
            ST: ssdp:all\n\
            MX: 5";