nativescript-background-http issue

I tried implementing image upload page for my app, but unfortunately the request is not reaching the server. I double checked this using tcpdump on the server side. The code doesnt seem to process beyond session.uploadFile in sendImages function

Please let me know if there is any issue with the code

var imageSource = require("image-source");
var frameModule = require("ui/frame");
var Observable = require("data/observable").Observable;
var fromObject = require("data/observable").fromObject;
var ObservableArray = require("data/observable-array").ObservableArray;
var platformModule = require("platform");

var permissions = require("nativescript-permissions");
var imagepickerModule = require("nativescript-imagepicker");
var bghttpModule = require("nativescript-background-http");
var session = bghttpModule.session("image-upload");

var fs = require("file-system");


var page;
var imageName;
var counter = 0;

function pageLoaded(args) {
    page = args.object;
}


function onSelectSingleTap(args) {
    var context = imagepickerModule.create({
        mode: "single"
    });

    if (platformModule.device.os === "Android" && platformModule.device.sdkVersion >= 23) {
        permissions.requestPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE, "I need these permissions to read from storage")
            .then(function () {
                console.log("Permissions granted!");
                startSelection(context);
            })
            .catch(function () {
                console.log("Uh oh, no permissions - plan B time!");
            });
    } else {
        startSelection(context);
    }
}

function sendImages(uri, fileUri) {

    imageName = extractImageName(fileUri);
    var request = {
        url: "http://maskingIpForPost:8081/mobilepic/ctk/uploadpic",
        method: "POST",
        headers: {
            "Content-Type": "application/octet-stream",
            "file-Name": imageName,
            "uid": 30
        },
        description: "{ 'uploading': " + imageName + " }"
    };

    var task = session.uploadFile(fileUri, request);

    task.on("progress", progress);
    task.on("error", error);
    task.on("complete", complete);
    task.on("responded", responded);
    function responded(e) {
        console.log("eventName: " + e.eventName);
        console.log("data: " + e.data);
    }
    function progress(e) {
        console.log("currentBytes: " + e.currentBytes);
        console.log("totalBytes: " + e.totalBytes);
        console.log("eventName: " + e.eventName);
    }
    function error(e) {
        console.log("eventName: " + e.eventName);
        console.log("eventName: " + e.responseCode);
        console.log("eventName: " + e.response);
    }

    function complete(e) {
        console.log("eventName: " + e.eventName);
        console.log("response: " + e.responseCode);
   }

    return task;
}

function startSelection(context) {

    context
        .authorize()
        .then(function () {

            return context.present();
        })
        .then(function (selection) {
            selection.forEach(function (selected_item) {
                    var localPath = null;

                    if (platformModule.device.os === "Android") {
                        localPath = selected_item._android;
                    } else {
                        // selected_item.ios for iOS is PHAsset and not path - so we are creating own path
                        let folder = fs.knownFolders.documents();
                        let path = fs.path.join(folder.path, "Test" + counter + ".png");
                        //let saved = imagesource.saveToFile(path, "png");

                        localPath = path;
                    }
alert("final path  " + localPath);
                    if (localPath) {
                        var task = sendImages("Image" + counter + ".png", localPath);
                        //mainViewModel.get("items").push(fromObject({ thumb: imagesource, uri: "Image" + counter + ".png", uploadTask: task }));
                    }
                    counter++;
            });
        }).catch(function (e) {
            console.log(e.eventName);
        });
}

function extractImageName(fileUri) {
    var pattern = /[^/]*$/;
    var imageName = fileUri.match(pattern);

    return imageName;
}


exports.pageLoaded = pageLoaded;
exports.onSelectSingleTap = onSelectSingleTap;

On Further research found the following

net.gotev.uploadservice.UploadService is undefined in background-http.android.js. At this moment i am not sure what this means. Would appreciate if anyone has idea about this