Portisch RF-Bridge Decode 0xB1 sniffed data

b1decode.js

/***
 * The following script decodes 0xB1 to 0xB0 
 * For more information on 0xB1 to 0xB0 decoding see https://github.com/Portisch/RF-Bridge-EFM8BB1/wiki/Decode-0xB1-sniffed-data
 *
 * The following site can also be used for decoding https://bbconv.hrbl.pl/
 *
 */ 

const readline = require('readline').createInterface({
    input: process.stdin,
    output: process.stdout
});

readline.question('Input Raw B1 string:\n Like: AA B1 04 017C 046A 0BCC 2378 3818190908181908190909090908190819081818190909091A 55 \n\n', B1Data => {
    console.log(`\nReceived "${B1Data}"\n`);
    readline.close();
    var B0Data = ParseB1(B1Data);
    console.log(`Parsed B0: ${B0Data.payload}\n`);;
});


function ParseB1(B1Received) {
    if (B1Received) {
        var OUTmsg = {};
        
        if (B1Received.indexOf("AA B1") !== -1) {
            OUTmsg.payload = parseRF(B1Received, 8);
            var OUTmsgNoSpaces = Object.assign({}, OUTmsg);
            OUTmsgNoSpaces.payload = OUTmsgNoSpaces.payload;// .replace(/ /g, "");
            return OUTmsgNoSpaces;
        }
    }
}


function parseRF(szInpStr, repVal) {
    const debug = false;
    const verbose = true;

    if (debug) { console.warn(`szInpStr: ${szInpStr}`); }
    if (verbose) { console.warn(`Repeat: ${repVal}`); }
    szInpStr = szInpStr.replace(/ /g, "");
    var iNbrOfBuckets = parseInt(szInpStr.slice(4, 6), 16);
    var arrBuckets = [];
    if (verbose) { console.warn(`Number of buckets: ${iNbrOfBuckets}`); }

    var szOutAux = ` ${hex2string(iNbrOfBuckets, 2)} `;
    szOutAux += `${hex2string(repVal, 2)} `;

    for (let i = 0; i < iNbrOfBuckets; i++) {
        szOutAux += szInpStr.slice(6 + i * 4, 10 + i * 4) + " "
        arrBuckets.push(parseInt(szInpStr.slice(6 + i * 4, 10 + i * 4), 16))
    }
    if (verbose) { console.warn(`arrBuckets: ${arrBuckets}`); }


    szOutAux += szInpStr.slice(6 + iNbrOfBuckets * 4, -2);

    var szDataStr = szOutAux.replace(/ /g, "");
    szOutAux += " 55";
    var iLength = parseInt(szDataStr.length / 2);
    szOutAux = "AA B0 " + hex2string(iLength, 2) + szOutAux;

    return szOutAux.toUpperCase();
}

function hex2string(hex, amount) {
    var string = parseInt(hex).toString(16);
    string = ("00000000" + string).slice(amount * -1);
    return string;
}