rust-ocpp 3.0.4

ocpp 1.6, 2.0.1 and 2.1 libraries
Documentation
use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use validator::Validate;

use crate::v2_1::datatypes::custom_data::CustomDataType;

/// HeartbeatRequest, sent by the Charging Station to the CSMS.
#[derive(Debug, Clone, PartialEq, Deserialize, Serialize, Validate)]
#[serde(rename_all = "camelCase")]
pub struct HeartbeatRequest {
    /// Custom data from the Charging Station.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub custom_data: Option<CustomDataType>,
}

/// HeartbeatResponse, sent by the CSMS to the Charging Station in response to a HeartbeatRequest.
#[derive(Debug, Clone, PartialEq, Deserialize, Serialize, Validate)]
#[serde(rename_all = "camelCase")]
pub struct HeartbeatResponse {
    /// Custom data from the CSMS.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub custom_data: Option<CustomDataType>,

    /// Required. Contains the current time of the CSMS.
    pub current_time: DateTime<Utc>,
}