TMRAppBle/script/electric.js

"use strict";

function calculateCRC16Modbus(dataHexString) {
    var dataBytes = [];
    for (var i = 0; i < dataHexString.length; i += 2) {
        dataBytes.push(parseInt(dataHexString.substr(i, 2), 16));
    }

    var crc = 0xFFFF;
    var polynomial = 0xA001; // This is the polynomial x^16 + x^15 + x^2 + 1

    var _iteratorNormalCompletion = true;
    var _didIteratorError = false;
    var _iteratorError = undefined;

    try {
        for (var _iterator = dataBytes[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
            var byte = _step.value;

            crc ^= byte;
            for (var _i = 0; _i < 8; _i++) {
                if (crc & 0x0001) {
                    crc = (crc >> 1 ^ polynomial) & 0xFFFF;
                } else {
                    crc >>= 1;
                }
            }
        }
    } catch (err) {
        _didIteratorError = true;
        _iteratorError = err;
    } finally {
        try {
            if (!_iteratorNormalCompletion && _iterator.return) {
                _iterator.return();
            }
        } finally {
            if (_didIteratorError) {
                throw _iteratorError;
            }
        }
    }

    return crc.toString(16).toUpperCase();
}

function getControlCmd(status, time) {
    var cmd = "FE1003F6000204" + status + "0000" + time;
    var crc = calculateCRC16Modbus(cmd);
    return cmd + crc.substring(2, 4) + crc.substring(0, 2);
}
var lastMsg = '';
function control(status, time) {
    var msg = "FFFF000D" + getControlCmd(status, time);
    msgVoice = msg;
}