node-red-contrib-symi/lib/protocols/alive/Switch.js

Node-RED nodes for smart home device communication with Home Assistant integration, supporting HassKit, Clowire, Alive, LF and complete Symi protocols

/**
 * Alive协议 - 开关设备处理
 * 基于Clowire协议但有细微差别
 */

/**
 * 缓冲区数据转对象
 * @param {Buffer} data 命令缓冲
 * @param {object} obj 节点对象
 */
function buf2obj(data, obj) {
    const protocolData = _protocol(data)
    if (!protocolData) return null
    
    protocolData.uid = obj.entity_id
    if (obj.uid === protocolData.id && obj.address === protocolData.address)
        return protocolData
    else
        return null
}

/**
 * 协议解析 (Alive协议从第2字节开始解析)
 * @param {Buffer} data 
 */
function _protocol(data) {
    if(!data) return;
    
    let obj = {}
    obj.id = data[1]      // Alive协议跳过第一个标识字节
    obj.address = data[3] // 地址位置调整
    
    // 开关命令判断
    if (data[2] === 0x20 && data[4] === 0x11) {
        obj.type = 'power'
        obj.val = data[6] ? 'on' : 'off'
        return obj
    }
    
    return null
}

/**
 * 对象转缓冲区
 * @param {object} obj HA状态对象
 * @param {object} obj1 节点对象
 */
function obj2buf(obj, obj1) {
    if (obj1.entity_id === obj.entity_id) {
        let state = obj.state === 'on' ? 1 : 0
        let buf = [obj1.uid, 0x20, obj1.address, 0x11, 0x00, state] // Alive协议不包含标识字节
        return buf
    }
    else
        return null
}

module.exports = {
    buf2obj,
    obj2buf
};