/*
This code (use in Node-RED function node) will parse the data coming from an Envertech Enverbridge EVB202 solar panel monitoring device.
Created by 'ThinkPadNL' 12-05-2022. Feel free to use
*/

var bridge = msg.payload;

if (bridge.length > 60) {

    var mi1_id = bridge.readUInt32BE(20).toString(16);
    var mi2_id = bridge.readUInt32BE(52).toString(16);
    var mi3_id = bridge.readUInt32BE(84).toString(16);
    
    var dc1 = parseFloat((bridge.readUInt16BE(26)/512).toFixed(2));
    var dc2 = parseFloat((bridge.readUInt16BE(58)/512).toFixed(2)); 
    var dc3 = parseFloat((bridge.readUInt16BE(90)/512).toFixed(2)); 
    
    var power1 = parseFloat((bridge.readUInt16BE(28)/64).toFixed(2));
    var power2 = parseFloat((bridge.readUInt16BE(60)/64).toFixed(2)); 
    var power3 = parseFloat((bridge.readUInt16BE(92)/64).toFixed(2)); 
    
    var total1 = parseFloat((bridge.readUInt32BE(30)/8192).toFixed(2));
    var total2 = parseFloat((bridge.readUInt32BE(62)/8192).toFixed(2)); 
    var total3 = parseFloat((bridge.readUInt32BE(94)/8192).toFixed(2)); 
    
    var temp1 = parseFloat(((((bridge.readUInt8(34)*256)+bridge.readUInt8(35))/128)-40).toFixed(2));
    var temp2 = parseFloat(((((bridge.readUInt8(66)*256)+bridge.readUInt8(67))/128)-40).toFixed(2));
    var temp3 = parseFloat(((((bridge.readUInt8(98)*256)+bridge.readUInt8(99))/128)-40).toFixed(2));
   
    var ac1 = parseFloat((bridge.readUInt16BE(36)/64).toFixed(2)); 
    var ac2 = parseFloat((bridge.readUInt16BE(68)/64).toFixed(2)); 
    var ac3 = parseFloat((bridge.readUInt16BE(100)/64).toFixed(2)); 
    
    var freq1 = parseFloat((bridge.readUInt8(38) + (bridge.readUInt8(39)/256)).toFixed(2));
    var freq2 = parseFloat((bridge.readUInt8(70) + (bridge.readUInt8(71)/256)).toFixed(2));
    var freq3 = parseFloat((bridge.readUInt8(102) + (bridge.readUInt8(103)/256)).toFixed(2));

    msg.payload = {
        [mi1_id]: {
        "pac": power1,
        "vpv": dc1,
        "vac": ac1,
        "freq": freq1,
        "etotal": total1,
        "temperature": temp1
        },
        [mi2_id]: {
            "pac": power2,
            "vpv": dc2,
            "vac": ac2,
            "freq": freq2,
            "etotal": total2,
            "temperature": temp2
        },
        [mi3_id]: { 
            "pac": power3,
            "vpv": dc3,
            "vac": ac3,
            "freq": freq3,
            "etotal": total3,
            "temperature": temp3
        }
    }

    var nodestate = {
        text: 'Pac1: ' + power1 + 'W Pac2: ' + power2 + 'W Pac3: ' + power3 + 'W'
    };
    node.status(nodestate);
    
    return msg;
}