node-red-contrib-kbr-ebus/nodes/kbr-ebus-telex-creator.js

KBR Gmbh - nodes for accessing ebus devices

module.exports = function(RED) { 

    var ebus= require("./ebus");
    
    function KBREbusTelexCreator(config) {
        RED.nodes.createNode(this,config);
        var node=this;

        node.on("close", function() {
            
        });
        node.on('input', function(msg) {            
            msg.from=msg.payload.from||config.from||0;
            msg.to=msg.payload.to||config.to||0;

            var data=msg.payload.data||config.data||"";

            var buffer=Buffer.from([]);
            if(Array.isArray(data)){
                buffer=Buffer.from(data);
            }
            else if(Buffer.isBuffer(data)){
                buffer=data;
            }
            else if (typeof data === 'string' || data instanceof String)
            {
                if(data.startsWith("[")){
                    buffer=Buffer.from(JSON.parse(data));
                }
                else{
                    var replace=data.indexOf("$");
                    if(replace>=0){
                        var payload=msg.payload;
                        var replbuffer=Buffer.from([]);
                        if(msg.payload.replbuffer)
                            payload=msg.payload.replbuffer;
                        if(Array.isArray(payload)){
                            replbuffer=Buffer.from(payload);
                        }
                        else if(Buffer.isBuffer(payload)){
                            replbuffer=payload;
                        }
                       
                        var hexvals=[];
                        replbuffer.forEach(function(byte){
                            hexvals.push(byte.toString(16));
                        });
                        var replstr=hexvals.join(",");
                        data=data.replace("$",replstr);
                    }
                    var strvals=data.split(",");
                    var arr=[];
                    strvals.forEach(function(item){
                        item=item.trim();
                        arr.push(parseInt("0x"+item,16));
                    });
                    buffer=Buffer.from(arr);
                }
            }

            msg.data=buffer
            msg.payload=ebus.createTelex(from,to,buffer);
            msg.topic=config.topic;
            node.send(msg);
        });
        
    }

    RED.nodes.registerType("kbr-ebus-telex-creator",KBREbusTelexCreator);
}