Update DFU for context pointers

Author: Stephen Schiffli

lib/metawear.js

@@ -318,11 +318,12 @@ MetaWear.prototype.updateFirmwareWithUrl = function (url, callback) {
       }.bind(this));
 
       var delegate = new MetaWear.DfuDelegate();
-      delegate.on_dfu_started = MetaWear.FnVoid.toPointer(onDfuStarted.bind(this));
-      delegate.on_dfu_cancelled = MetaWear.FnVoid.toPointer(onDfuCancelled.bind(this));
-      delegate.on_transfer_percentage = MetaWear.FnVoid_Int.toPointer(onTransferPercentage.bind(this));
-      delegate.on_successful_file_transferred = MetaWear.FnVoid.toPointer(onSuccessfulFileTransfer.bind(this));
-      delegate.on_error = MetaWear.FnVoid_charP.toPointer(onError.bind(this));
+      delegate.context = ref.NULL;
+      delegate.on_dfu_started = MetaWear.FnVoid_VoidP.toPointer(onDfuStarted.bind(this));
+      delegate.on_dfu_cancelled = MetaWear.FnVoid_VoidP.toPointer(onDfuCancelled.bind(this));
+      delegate.on_transfer_percentage = MetaWear.FnVoid_VoidP_Int.toPointer(onTransferPercentage.bind(this));
+      delegate.on_successful_file_transferred = MetaWear.FnVoid_VoidP.toPointer(onSuccessfulFileTransfer.bind(this));
+      delegate.on_error = MetaWear.FnVoid_VoidP_charP.toPointer(onError.bind(this));
       MetaWear.mbl_mw_metawearboard_perform_dfu(this.board, delegate.ref(), ref.allocCString(filename));
     }
   }.bind(this));
@@ -392,23 +393,23 @@ function invokeAndClearCallback(error) {
 //
 // DFU Delegate
 //
-function onDfuStarted() {
+function onDfuStarted(context) {
   this.emit('dfuStarted');
   debug('onDfuStarted');
 }
-function onDfuCancelled() {
+function onDfuCancelled(context) {
   debug('onDfuCancelled');
 }
-function onTransferPercentage(percentage) {
+function onTransferPercentage(context, percentage) {
   debug('transferPercentage ' + percentage);
   this.percentage = percentage;
   this.emit('transferPercentage', percentage);
 }
-function onSuccessfulFileTransfer() {
+function onSuccessfulFileTransfer(context) {
   debug('onSuccessfulFileTransfer');
   this.emit('onSuccessfulFileTransfer');
 }
-function onError(message) {
+function onError(context, message) {
   debug('dfu error: ' + message);
   invokeAndClearCallback.call(this, new Error(message));
 }