ocpp_rs 0.4.2

no_std + alloc OCPP 1.6 and 2.1 protocol library (OCPP-J parse/serialize, CallResult correlation).
Documentation 
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//! Structured logging helper for OCPP 2.1 messages.

use crate::v21::parse::Message;
use alloc::string::{String, ToString};
use serde::{Deserialize, Serialize};
use serde_json::json;

#[derive(Debug, PartialEq, Eq, Serialize, Deserialize, Clone)]
pub struct MessageLogLine {
    pub core_type: String,
    pub payload_type: String,
    pub payload: String,
}

impl MessageLogLine {
    /// Build a log line from a blind [`Message`].
    ///
    /// CALLRESULT uses `"CallResultRaw"` as `payload_type` because the concrete response type
    /// is not known until resolved via [`crate::v21::pending::PendingCalls`].
    #[must_use]
    pub fn from_message(message: &Message) -> Self {
        match message {
            Message::Call(call) => Self {
                core_type: "Call".to_string(),
                payload_type: call.action.clone(),
                payload: serde_json::to_string(&call.payload)
                    .unwrap_or_else(|_| json!({"error": "Serialization failed"}).to_string()),
            },
            Message::CallResult(call_result) => Self {
                core_type: "CallResult".to_string(),
                payload_type: "CallResultRaw".to_string(),
                payload: alloc::string::ToString::to_string(&call_result.payload),
            },
            Message::CallError(call_error) => Self {
                core_type: "CallError".to_string(),
                payload_type: "Error".to_string(),
                payload: json!({
                    "error_code": call_error.error_code,
                    "error_description": call_error.error_description,
                    "error_details": call_error.error_details,
                })
                .to_string(),
            },
            Message::CallResultError(err) => Self {
                core_type: "CallResultError".to_string(),
                payload_type: "Error".to_string(),
                payload: json!({
                    "error_code": err.error_code,
                    "error_description": err.error_description,
                    "error_details": err.error_details,
                })
                .to_string(),
            },
            Message::Send(send) => Self {
                core_type: "Send".to_string(),
                payload_type: send.action.clone(),
                payload: serde_json::to_string(&send.payload)
                    .unwrap_or_else(|_| json!({"error": "Serialization failed"}).to_string()),
            },
        }
    }
}