iot-dashboard/dist/plugins/datasources/digimondoGpsDatasource.js

A generic dashboard application based on JavaScript, HTML and CSS. http://iot-dashboard.org

"use strict";

(function () {

    // Digimondo Frontend: https://frontend.digimondo.io/login

    // https://api.digimondo.io/v1/aaaaaaaabbccddff?auth=3a9fce0d7fd743e56010d770d7432f6f&limitToLast=10
    // &offset=10
    // &payloadonly
    // TODO: Make a boolean flag to only receive new values based on "receivedAfter" set to last received value

    var TYPE_INFO = {
        type: "digimondo-gps-datasource",
        name: "Digimondo Gps",
        version: "0.0.1",
        author: "Lobaro",
        kind: "datasource",
        description: "Fetch GPS Locations from the Digimondo API",
        settings: [{
            id: "auth",
            name: "Auth Token",
            description: "Digimondo Authentication Token",
            defaultValue: "",
            required: true,
            type: "string"
        }, {
            id: "appEui",
            name: "Application EUI",
            description: "Digimondo Application EUI",
            defaultValue: "",
            required: true,
            type: "string"
        }, {
            id: "moteeui",
            name: "Filter Device EUI",
            description: "Only parse data from given Device EUI",
            defaultValue: "",
            type: "string"
        }, {
            id: "limitToLast",
            name: "Limit",
            description: "The amount of most recent Packets to be returned",
            defaultValue: 0,
            type: "number"
        }, {
            id: "offset",
            name: "Offset",
            description: "The amount of most recent Packets to skip",
            defaultValue: 0,
            type: "number"
        }, {
            id: "receivedAfter",
            name: "Received After",
            description: "Only return packets after this date",
            defaultValue: 0,
            type: "number"
        }]
    };

    function safeParseJsonObject(string) {
        try {
            return JSON.parse(string);
        } catch (e) {
            console.error("Was not able to parse JSON: " + string);
            return {};
        }
    }

    function base64ToHex(str) {
        for (var i = 0, bin = atob(str.replace(/[ \r\n]+$/, "")), _hex = []; i < bin.length; ++i) {
            var tmp = bin.charCodeAt(i).toString(16);
            if (tmp.length === 1) tmp = "0" + tmp;
            _hex[_hex.length] = tmp;
        }
        return hex;
    }

    function payloadToGps(payload) {
        var hexValue = base64ToHex(payload);

        // ADUcDjcJNybM
        // 8  bits int seqNum
        var seqNum = parseInt("0x" + hexValue[0]);
        // 8  bits int lat_deg
        var lat_deg = parseInt("0x" + hexValue[1]);
        // 8  bits int lat_min
        var lat_min = parseInt("0x" + hexValue[2]);
        // 16 bits int lat_10000min
        var lat_10000min = parseInt("0x" + hexValue[3] + hexValue[4]);
        // 8  bits int long_deg
        var long_deg = parseInt("0x" + hexValue[5]);
        // 8  bits int long_min
        var long_min = parseInt("0x" + hexValue[6]);
        // 16 bits int long_10000min
        var long_10000min = parseInt("0x" + hexValue[7] + hexValue[8]);

        return {
            "lat": lat_deg + lat_min / 60 + lat_10000min / 10000 / 60,
            "lng": long_deg + long_min / 60 + long_10000min / 10000 / 60
        };
    }

    function fetchData() {

        var history = [];
        var settings = this.props.state.settings;
        var auth = settings.auth;

        var self = this;

        fetch("https://api.digimondo.io/v1/" + settings.appEui + "?auth=" + auth + (settings.limitToLast ? "&limitToLast=" + settings.limitToLast : "") + (settings.offset ? "&offset=" + settings.offset : "") + (settings.receivedAfter ? "&receivedAfter=" + settings.receivedAfter : "") + "&payloadonly").then(function (response) {
            return response.json();
        }).then(function (data) {

            _.forEach(data, function (value) {
                if (settings.moteeui && value.moteeui !== settings.moteeui) {
                    return;
                }
                try {
                    value.gps = payloadToGps(value.payload);
                } catch (e) {
                    console.warn("Failed to parse GPS data from payload: ", value.payload);
                }
                //console.log("value:", value);
                history.push(value);
                self.history = history;
            });
        });

        /*
         const maxValues = Number(this.props.maxValues) || 1000;
         while (history.length > maxValues) {
         this.history.shift();
         }      */
    }

    function Datasource(props) {

        this.initialize = function (props) {
            var history = props.state.data;
            this.props = props;

            this.interval = setInterval(fetchData.bind(this), 2000);
            this.history = history || [];
        };

        this.updateProps = function (props) {
            this.props = props;
            fetchData();
            console.log("update props");
        };

        this.getValues = function () {
            return this.history;
        };

        this.dispose = function () {
            this.history = [];
            clearInterval(this.interval);
        };
    }

    window.iotDashboardApi.registerDatasourcePlugin(TYPE_INFO, Datasource);
})();