Worklight JavaScript HTTP adapter unable to receive request data

I am trying to understand how MFP JSONStore & HTTP adapters work. I downloaded the source code here. I followed the steps to build the app. I also deployed this adapter here. But when I tried to push the dirty data to the adapter, I got noting there. The adapter still logs undefined.

Here is the push function code:

function pushToAdapter(){
    alert("pushToAdapter");
    try {
        WL.JSONStore.get(collectionName).push().then(function (res) {
            if(Array.isArray(res) && res.length < 1){ // I changed this to res.length > 1
                document.getElementById("resultsDiv").innerHTML = "Documents Pushed Successfuly";
            } else {
                document.getElementById("resultsDiv").innerHTML = "Failed To Push Documents to Adapter: "+ res[0].errorObject;
            }   
        }).fail(function (errorObject) {
            alert(errorObject.msg);
        });
    } catch (e) {
        alert("Failed To Push Documents to Adapter");
    }
}

& this is the adapter code:

function pushPeople(data) {
    MFP.Logger.debug('Adapter: JSONStoreAdapter, procedure: pushPeople called.');
    MFP.Logger.debug('Got data from JSONStore to ADD: ' + JSON.stringify(data)); //always undefined
    return;
}

function addPerson(data) {
    MFP.Logger.debug('Adapter: JSONStoreAdapter, procedure: addPerson called.');
    MFP.Logger.debug('Got data from JSONStore to ADD: ' + JSON.stringify(data)); //always undefined
    return;
}

function removePerson(data) {
    MFP.Logger.debug('Adapter: JSONStoreAdapter, procedure: removePerson called.');
    MFP.Logger.debug('Got data from JSONStore to REMOVE: ' + JSON.stringify(data)); //always undefined
    return;
}

Please note that I am using a patched version of cordova-plugin-mfp-jsonstore. It is the same as this version except for lines 5238 (as follows):

resourceRequest = new WLResourceRequest('adapters/' + invocationData.adapter + '/' + invocationData.procedure,  WLResourceRequest.POST);
resourceRequest.setHeader('Content-Type','application/x-www-form-urlencoded'); //patched version
resourceRequest.send().then(ipOpts.onSuccess, ipOpts.onFailure);

Looks like the parameters were not being passed as a part of the push request. You can use the jsonstore.js provided here and verify if it solves your problem. This will be officially released in the next iFix.