matc 0.1.2

Matter protocol library (controller side)
Documentation 
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//! Matter TLV encoders and decoders for WebRTC Transport Requestor Cluster
//! Cluster ID: 0x0554
//!
//! This file is automatically generated from WebRTC_Requestor.xml

use crate::tlv;
use anyhow;
use serde_json;


// Command encoders

/// Encode Offer command (0x00)
pub fn encode_offer(web_rtc_session_id: u8, sdp: String, ice_transport_policy: String) -> anyhow::Result<Vec<u8>> {
    let tlv = tlv::TlvItemEnc {
        tag: 0,
        value: tlv::TlvItemValueEnc::StructInvisible(vec![
        (0, tlv::TlvItemValueEnc::UInt8(web_rtc_session_id)).into(),
        (1, tlv::TlvItemValueEnc::String(sdp)).into(),
        (3, tlv::TlvItemValueEnc::String(ice_transport_policy)).into(),
        ]),
    };
    Ok(tlv.encode()?)
}

/// Encode Answer command (0x01)
pub fn encode_answer(web_rtc_session_id: u8, sdp: String) -> anyhow::Result<Vec<u8>> {
    let tlv = tlv::TlvItemEnc {
        tag: 0,
        value: tlv::TlvItemValueEnc::StructInvisible(vec![
        (0, tlv::TlvItemValueEnc::UInt8(web_rtc_session_id)).into(),
        (1, tlv::TlvItemValueEnc::String(sdp)).into(),
        ]),
    };
    Ok(tlv.encode()?)
}

/// Encode ICECandidates command (0x02)
pub fn encode_ice_candidates(web_rtc_session_id: u8) -> anyhow::Result<Vec<u8>> {
    let tlv = tlv::TlvItemEnc {
        tag: 0,
        value: tlv::TlvItemValueEnc::StructInvisible(vec![
        (0, tlv::TlvItemValueEnc::UInt8(web_rtc_session_id)).into(),
        ]),
    };
    Ok(tlv.encode()?)
}

/// Encode End command (0x03)
pub fn encode_end(web_rtc_session_id: u8, reason: u8) -> anyhow::Result<Vec<u8>> {
    let tlv = tlv::TlvItemEnc {
        tag: 0,
        value: tlv::TlvItemValueEnc::StructInvisible(vec![
        (0, tlv::TlvItemValueEnc::UInt8(web_rtc_session_id)).into(),
        (1, tlv::TlvItemValueEnc::UInt8(reason)).into(),
        ]),
    };
    Ok(tlv.encode()?)
}

// Attribute decoders

/// Decode CurrentSessions attribute (0x0000)
pub fn decode_current_sessions(inp: &tlv::TlvItemValue) -> anyhow::Result<Vec<u8>> {
    let mut res = Vec::new();
    if let tlv::TlvItemValue::List(v) = inp {
        for item in v {
            if let tlv::TlvItemValue::Int(i) = &item.value {
                res.push(*i as u8);
            }
        }
    }
    Ok(res)
}


// JSON dispatcher function

/// Decode attribute value and return as JSON string
///
/// # Parameters
/// * `cluster_id` - The cluster identifier
/// * `attribute_id` - The attribute identifier
/// * `tlv_value` - The TLV value to decode
///
/// # Returns
/// JSON string representation of the decoded value or error
pub fn decode_attribute_json(cluster_id: u32, attribute_id: u32, tlv_value: &crate::tlv::TlvItemValue) -> String {
    // Verify this is the correct cluster
    if cluster_id != 0x0554 {
        return format!("{{\"error\": \"Invalid cluster ID. Expected 0x0554, got {}\"}}", cluster_id);
    }

    match attribute_id {
        0x0000 => {
            match decode_current_sessions(tlv_value) {
                Ok(value) => serde_json::to_string(&value).unwrap_or_else(|_| "null".to_string()),
                Err(e) => format!("{{\"error\": \"{}\"}}", e),
            }
        }
        _ => format!("{{\"error\": \"Unknown attribute ID: {}\"}}", attribute_id),
    }
}

/// Get list of all attributes supported by this cluster
///
/// # Returns
/// Vector of tuples containing (attribute_id, attribute_name)
pub fn get_attribute_list() -> Vec<(u32, &'static str)> {
    vec![
        (0x0000, "CurrentSessions"),
    ]
}