hotfix 0.12.0

Buy-side FIX engine written in pure Rust
Documentation 
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use crate::message::OutboundMessage;
use hotfix_message::Part;
use hotfix_message::message::Message;
use hotfix_message::session_fields::TEST_REQ_ID;

#[derive(Clone, Debug, Default)]
pub struct Heartbeat {
    test_req_id: Option<String>,
}

impl Heartbeat {
    pub const MSG_TYPE: &str = "0";

    pub fn for_request(test_req_id: String) -> Self {
        Self {
            test_req_id: Some(test_req_id),
        }
    }
}

impl OutboundMessage for Heartbeat {
    fn write(&self, msg: &mut Message) {
        if let Some(req_id) = &self.test_req_id {
            msg.set(TEST_REQ_ID, req_id.as_str());
        }
    }

    fn message_type(&self) -> &str {
        Self::MSG_TYPE
    }
}