BC.DataValue to be used as ArrayBuffer in Uint8Array does not work

[sixbladeknife]

hi, I'm trying to send binary data over bluetooth through RFCOMM. I subscribe a incoming data callback using:

BTMod.connectedDevice.rfcommSubscribe(rxCallback);

and I define my callback similarly as:

rxCallback: function(data)  //is data of type BC.DataValue?
    {
        var rawData = new Uint8Array(data.value);
...
        console.log("hex received: " + data.value.getHexString());
        console.log("raw received: " + JSON.stringify(rawData));
...

logcat report as follow:

07-01 16:26:50.875: I/Web Console(17384): hex received: c0035a172200160100000000010000010000000300017a5268c1:166
07-01 16:26:50.875: I/Web Console(17384): raw received: {"byteOffset":0,"byteLength":0,"buffer":{"byteLength":0},"length":0}:168

which tells me rawData is a correctly instantiated empty Uint8Array object, which is not what I expected to have, while variable data contains expected binary data. It seems that data, which should be of BC.DataValue type, does not return a ArrayBuffer object with the method value. What am I doing wrong?

thanks in advance

bye

sixbladeknife

[dantiana]

Looking into the issue. Let's check.

[lizhijumacc]

'data.value' is BC.DataValue and the 'data' contains more information. use 'data' like this:

device.rfcommSubscribe(onDataAvaliable);
function onDataAvaliable(data){
    $("#notifyValue_hex").html(data.value.getHexString());
    $("#notifyValue_unicode").html(data.value.getUnicodeString());
    $("#notifyValue_ascii").html(data.value.getASCIIString());
    $("#notifyDate").html(data.date);
} 

[lizhijumacc]

BTW: data.value.value is an ArrayBuffer in Uint8Array type. you can new the rawData like this:

var rawData = new Uint8Array(data.value.value);

[sixbladeknife]

thanks lizhijumacc, that did the trick, though documentation is pretty much unclear about a "custom" use of BC.DataValue. I humbly suggest to expand it a bit.

However, to make me understand fully:

• is data of type BC.DataValue?
• is also data.value of type BC.DataValue? if so...why?

[lizhijumacc]

Sorry for that. the rfcommSubscribe callback parameter 'data' is not type of the BC.DataValue , 'data' is just a common JSON object which contains the BC.DataValue field, the 'data.value' is BC.DataValue, so you can call the BC.DataValue function 'getHexString' for data.value. the data.value.value is an ArrayBuffer of Uint8Array~

you can dump the internal data structure about the 'data' object.

device.rfcommSubscribe(onDataAvaliable);
function onDataAvaliable(data){
    alert(JSON.stringify(data));
} 

Thanks for your advice, I will check the document later.

[sixbladeknife]

ok! once again thank you