Function encode_echo_reply 

pub fn encode_echo_reply(
    reply: &EchoReply,
    params: &Params,
    hmac_key: Option<&[u8]>,
) -> Result<Vec<u8>>

Encodes an ECHO reply.

params supplies the negotiated layout and length, exactly as on the request side, and every optional field the layout requires must be present in reply: a Some where the layout has no field, or a None where it has one, is an error. hmac_key is authoritative: Some(key) sets FLAG_HMAC and signs the finished datagram.

Errors

Returns ProtoError::MissingFlag or ProtoError::UnexpectedFlag when the reply does not carry exactly the packet-type flags this encoder requires, ProtoError::MissingField or ProtoError::UnexpectedField when reply’s optional fields do not match the negotiated layout, and ProtoError::PayloadTooLarge when the payload does not fit the negotiated length.

Example

use irtt_proto::{
    decode_echo_reply, encode_echo_reply, EchoReply, Params, ReceivedStats,
    TimestampFields, FLAG_REPLY,
};

// `received_stats` negotiates a receive counter; four payload bytes.
let params = Params {
    length: 24,
    received_stats: ReceivedStats::Count,
    ..Params::default()
};
let reply = EchoReply {
    flags: FLAG_REPLY,
    token: 0x1234_5678_9abc_def0,
    sequence: 7,
    recv_count: Some(3),
    recv_window: None,
    timestamps: TimestampFields::default(),
    payload: vec![1, 2, 3, 4],
};

let packet = encode_echo_reply(&reply, &params, None).unwrap();
assert_eq!(decode_echo_reply(&packet, &params, None).unwrap(), reply);