diff --git a/app/src/main/java/com/codigoparallevar/minicards/CanvasView.java b/app/src/main/java/com/codigoparallevar/minicards/CanvasView.java
index 23d9f73..e04b030 100644
--- a/app/src/main/java/com/codigoparallevar/minicards/CanvasView.java
+++ b/app/src/main/java/com/codigoparallevar/minicards/CanvasView.java
@@ -32,7 +32,7 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
-class CanvasView extends View implements PartGrid {
+public class CanvasView extends View implements PartGrid {
 
     @NonNull
     List<Part> parts = new ArrayList<>();
diff --git a/app/src/main/java/com/codigoparallevar/minicards/CardActivity.java b/app/src/main/java/com/codigoparallevar/minicards/CardActivity.java
index 4249320..1b86b80 100644
--- a/app/src/main/java/com/codigoparallevar/minicards/CardActivity.java
+++ b/app/src/main/java/com/codigoparallevar/minicards/CardActivity.java
@@ -3,13 +3,16 @@ package com.codigoparallevar.minicards;
 import android.content.Context;
 import android.content.Intent;
 
+import com.codigoparallevar.minicards.toolbox.PartsHolder;
 import com.codigoparallevar.minicards.types.functional.Consumer;
 import com.codigoparallevar.minicards.types.functional.Producer;
 import com.codigoparallevar.minicards.types.functional.Tuple2;
+import com.codigoparallevar.minicards.types.functional.Tuple3;
 import com.codigoparallevar.minicards.ui_helpers.GetAsync;
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
 import com.programaker.api.ProgramakerApi;
-import com.programaker.api.data.ProgramakerCustomBlock;
+import com.programaker.api.data.ProgramakerBridgeInfo;
+import com.programaker.api.data.api_results.ProgramakerBridgeCustomBlockResult;
 import com.programaker.api.data.api_results.ProgramakerGetCustomBlocksResult;
 
 import androidx.appcompat.app.ActionBar;
@@ -30,6 +33,7 @@ public class CardActivity extends AppCompatActivity {
     public static final String CARD_PATH_KEY = "CARD_PATH";
     public static final String VISUALIZATION_MODE_KEY = "VISUALIZATION_MODE";
     public static final String DEVELOPER_VISUALIZATION_MODE = "DEVELOPER_VISUALIZATION_MODE";
+    public static final String USER_VISUALIZATION_MODE = "USER_VISUALIZATION_MODE";
 
     CanvasView canvasView;
     com.getbase.floatingactionbutton.AddFloatingActionButton AddPartButton;
@@ -47,6 +51,7 @@ public class CardActivity extends AppCompatActivity {
     private PartsHolder partsHolder;
     private ProgramakerApi ProgramakerApi;
     private ConfigManager Config;
+    private ProgramakerGetCustomBlocksResult CustomBlocks = null;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -59,21 +64,27 @@ public class CardActivity extends AppCompatActivity {
             this.ProgramakerApi.setToken(token);
         }
 
-        new GetAsync<ProgramakerGetCustomBlocksResult>().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR,
-                new Tuple2<>(new Producer<ProgramakerGetCustomBlocksResult>() {
+        partsHolder = new PartsHolder(this);
+
+        new GetAsync<Tuple2<List<ProgramakerBridgeInfo>, List<ProgramakerBridgeCustomBlockResult>>>()
+                .executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR,
+                new Tuple3<>(new Producer<Tuple2<List<ProgramakerBridgeInfo>, List<ProgramakerBridgeCustomBlockResult>>>() {
                     @Override
-                    public ProgramakerGetCustomBlocksResult get() {
-                        return CardActivity.this.ProgramakerApi.fetchCustomBlocks();
+                    public Tuple2<List<ProgramakerBridgeInfo>, List<ProgramakerBridgeCustomBlockResult>> get() {
+                        return new Tuple2<>(
+                                CardActivity.this.ProgramakerApi.fetchConnectedBridges(),
+                                CardActivity.this.ProgramakerApi.fetchCustomBlocks());
                     }
-                }, new Consumer<ProgramakerGetCustomBlocksResult>() {
+                }, new Consumer<Tuple2<List<ProgramakerBridgeInfo>,List<ProgramakerBridgeCustomBlockResult>>>() {
                     @Override
-                    public void apply(ProgramakerGetCustomBlocksResult result) {
-                        if (result == null) {
-                            Log.e("CARDActivity", "error retrieving custom blocks");
-                        }
-                        else {
-                            Log.d("CARDActivity", "custom blocks: " + result.toString());
-                        }
+                    public void apply(Tuple2<List<ProgramakerBridgeInfo>,List<ProgramakerBridgeCustomBlockResult>> result) {
+                        partsHolder.addCustomBlocks(result.item1, result.item2);
+                        Log.d("CARDActivity", "custom blocks: " + result.toString());
+                    }
+                }, new Consumer<Throwable> () {
+                    @Override
+                    public void apply(Throwable exception) {
+                        Log.e("CARDActivity", "error retrieving custom blocks: " + exception.toString());
                     }
                 }));
 
@@ -91,7 +102,6 @@ public class CardActivity extends AppCompatActivity {
         canvasView.setParentActivity(this);
 
         // Initialize auxiliary elements
-        partsHolder = new PartsHolder(this);
 
         removePartFab = (FloatingActionButton) findViewById(R.id.remove_part_fab);
         canvasView.setDropZone(
@@ -235,12 +245,12 @@ public class CardActivity extends AppCompatActivity {
             if (canvasView.isDragging()){
                 devFabMenu.setVisibility(View.GONE);
                 userFabMenu.setVisibility(View.GONE);
-                removePartFab.setVisibility(View.VISIBLE);
+                ((View)removePartFab).setVisibility(View.VISIBLE);
                 Log.d("Main", "Changing visibility!");
             }
             else {
                 this.setDevMode(devMode);
-                removePartFab.setVisibility(View.GONE);
+                ((View)removePartFab).setVisibility(View.GONE);
                 Log.d("Main", "Now changing visibility!");
             }
             canvasView.setDropZone(
@@ -250,8 +260,16 @@ public class CardActivity extends AppCompatActivity {
     }
 
     public static void openCard(Context context, CardFile cardfile, String visualizationMode) {
+        openCardByPath(context, cardfile.getPath(), visualizationMode);
+    }
+
+    public static void openCard(Context context, PreviewCard cardfile, String visualizationMode) {
+        openCardByPath(context, cardfile.getPath(), visualizationMode);
+    }
+
+    private static void openCardByPath(Context context, String path, String visualizationMode) {
         Intent i = new Intent(INTENT);
-        i.putExtra(CARD_PATH_KEY, cardfile.getPath());
+        i.putExtra(CARD_PATH_KEY, path);
         if (visualizationMode != null) {
             i.putExtra(VISUALIZATION_MODE_KEY, visualizationMode);
         }
diff --git a/app/src/main/java/com/codigoparallevar/minicards/CardPreviewArrayAdapter.java b/app/src/main/java/com/codigoparallevar/minicards/CardPreviewArrayAdapter.java
index 0042d42..8e2aab6 100644
--- a/app/src/main/java/com/codigoparallevar/minicards/CardPreviewArrayAdapter.java
+++ b/app/src/main/java/com/codigoparallevar/minicards/CardPreviewArrayAdapter.java
@@ -50,9 +50,7 @@ class CardPreviewArrayAdapter extends ArrayAdapter<PreviewCard> {
         cardView.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                Intent i = new Intent(CardActivity.INTENT);
-                i.putExtra(CardActivity.CARD_PATH_KEY, card.getPath());
-                CardPreviewArrayAdapter.this.getContext().startActivity(i);
+                CardActivity.openCard(getContext(), card, CardActivity.DEVELOPER_VISUALIZATION_MODE);
             }
         });
 
diff --git a/app/src/main/java/com/codigoparallevar/minicards/PartsHolder.java b/app/src/main/java/com/codigoparallevar/minicards/PartsHolder.java
deleted file mode 100644
index ca142e6..0000000
--- a/app/src/main/java/com/codigoparallevar/minicards/PartsHolder.java
+++ /dev/null
@@ -1,67 +0,0 @@
-package com.codigoparallevar.minicards;
-
-import android.app.Dialog;
-import android.content.Context;
-import android.content.DialogInterface;
-import androidx.appcompat.app.AlertDialog;
-import android.util.Log;
-
-import com.codigoparallevar.minicards.parts.buttons.RoundButton;
-import com.codigoparallevar.minicards.parts.logic.Ticker;
-import com.codigoparallevar.minicards.parts.logic.Toggle;
-import com.codigoparallevar.minicards.parts.samples.ColorBox;
-import com.codigoparallevar.minicards.parts.strings.ConvertToString;
-import com.codigoparallevar.minicards.types.Part;
-import com.codigoparallevar.minicards.types.functional.Tuple2;
-
-import java.util.List;
-import java.util.Vector;
-
-class PartsHolder {
-    private final Context context;
-
-    private final static List<Tuple2<String, PartInstantiator>> BuiltInParts =
-            new Vector<Tuple2<String, PartInstantiator>>(){{
-                add(new Tuple2<>("Round button", RoundButton.getInstantiator()));
-                add(new Tuple2<>("Ticker", Ticker.getInstantiator()));
-                add(new Tuple2<>("Red/Green box", ColorBox.getInstantiator()));
-                add(new Tuple2<>("Toggle", Toggle.getInstantiator()));
-                add(new Tuple2<>("ToString", ConvertToString.getInstantiator()));
-    }};
-
-    public PartsHolder(Context context) {
-        this.context = context;
-    }
-
-    public void openAddPartModal(final CanvasView canvasView) {
-        AlertDialog.Builder builder = new AlertDialog.Builder(context);
-        builder.setTitle("Choose part type")
-                .setItems(getPartTypes(), new DialogInterface.OnClickListener() {
-                    public void onClick(DialogInterface dialog, int which) {
-                        if ((which >= 0) && (which < BuiltInParts.size())){
-                            Log.d("Minicards partsHolder",
-                                    "Spawning " + BuiltInParts.get(which).item1);
-                            PartInstantiator instantiator = BuiltInParts.get(which).item2;
-                            PartsHolder.this.runInstantiator(instantiator, canvasView);
-                        }
-                    }
-                });
-
-        Dialog dialog = builder.create();
-        dialog.show();
-    }
-
-    private void runInstantiator(PartInstantiator instantiator, CanvasView canvasView) {
-        Part part = instantiator.build(canvasView);
-        canvasView.addPart(part);
-    }
-
-    private static String[] getPartTypes() {
-        String[] partTypes = new String[BuiltInParts.size()];
-        for (int i = 0; i < BuiltInParts.size(); i++){
-            partTypes[i] = BuiltInParts.get(i).item1;
-        }
-
-        return partTypes;
-    }
-}
diff --git a/app/src/main/java/com/codigoparallevar/minicards/parts/ProgramakerCustomBlockPart.java b/app/src/main/java/com/codigoparallevar/minicards/parts/ProgramakerCustomBlockPart.java
new file mode 100644
index 0000000..41223e4
--- /dev/null
+++ b/app/src/main/java/com/codigoparallevar/minicards/parts/ProgramakerCustomBlockPart.java
@@ -0,0 +1,142 @@
+package com.codigoparallevar.minicards.parts;
+
+import android.util.Log;
+
+import com.codigoparallevar.minicards.ScrolledCanvas;
+import com.codigoparallevar.minicards.types.Moveable;
+import com.codigoparallevar.minicards.types.Part;
+import com.codigoparallevar.minicards.types.PartGrid;
+import com.codigoparallevar.minicards.types.connectors.input.InputConnector;
+import com.codigoparallevar.minicards.types.connectors.output.OutputConnector;
+import com.codigoparallevar.minicards.types.functional.Tuple2;
+import com.codigoparallevar.minicards.types.wireData.WireDataType;
+import com.programaker.api.data.ProgramakerCustomBlock;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.List;
+import java.util.UUID;
+
+public class ProgramakerCustomBlockPart implements Part {
+
+
+    private final PartGrid _partGrid;
+    private final String _id;
+    private int _xCenter;
+    private int _yCenter;
+    private final ProgramakerCustomBlock _block;
+
+    public ProgramakerCustomBlockPart(String id, PartGrid grid, Tuple2<Integer, Integer> center, ProgramakerCustomBlock block) {
+        this._id = id;
+        this._partGrid = grid;
+        this._xCenter = center.item1;
+        this._yCenter = center.item2;
+        this._block = block;
+    }
+
+    public ProgramakerCustomBlockPart(PartGrid grid, Tuple2<Integer, Integer> center, ProgramakerCustomBlock block) {
+        this(UUID.randomUUID().toString(), grid, center, block);
+    }
+
+    @Override
+    public int get_left() {
+        return 0; // TODO: Implement
+    }
+
+    @Override
+    public int get_right() {
+        return 0; // TODO: Implement
+    }
+
+    @Override
+    public int get_top() {
+        return 0; // TODO: Implement
+    }
+
+    @Override
+    public int get_bottom() {
+        return 0; // TODO: Implement
+    }
+
+    @Override
+    public void touched() {
+        Log.i("CustomBlockPart", "Part touched (block_fun=" + this._block.getFunction_name() + ")");
+    }
+
+    @Override
+    public List<InputConnector> getInputConnectors() {
+        return null;
+    }
+
+    @Override
+    public List<OutputConnector> getOutputConnectors() {
+        return null;
+    }
+
+    @Override
+    public JSONObject serialize() throws JSONException {
+        return null;
+    }
+
+    @Override
+    public void send(InputConnector inputConnector, WireDataType signal) {
+
+    }
+
+    @Override
+    public String get_id() {
+        return _id;
+    }
+
+    @Override
+    public InputConnector getConnectorWithId(String inputConnectorId) {
+        return null;
+    }
+
+    @Override
+    public String getConnectorId(InputConnector inputConnector) {
+        return null;
+    }
+
+    @Override
+    public void resume() {
+        // Intentionally left empty
+    }
+
+    @Override
+    public void pause() {
+        // Intentionally left empty
+    }
+
+    @Override
+    public void draw(ScrolledCanvas canvas, boolean devMode) {
+        // TODO: Implement
+    }
+
+    @Override
+    public void moveEnd(int x, int y) {
+        // TODO: Implement moving connectors
+    }
+
+    @Override
+    public void drop(int x, int y) {
+        moveEnd(x, y);
+    }
+
+    @Override
+    public boolean containsPoint(int x, int y) {
+        return ((x >= this.get_left()) && (x <= this.get_right())
+                && (y >= this.get_top()) && (y <= this.get_top()));
+    }
+
+    @Override
+    public Moveable getMoveable() {
+        return this;
+    }
+
+    @Override
+    public void unlink() {
+        // TODO: Implement
+    }
+}
diff --git a/app/src/main/java/com/codigoparallevar/minicards/toolbox/PartCategory.java b/app/src/main/java/com/codigoparallevar/minicards/toolbox/PartCategory.java
new file mode 100644
index 0000000..aff6e14
--- /dev/null
+++ b/app/src/main/java/com/codigoparallevar/minicards/toolbox/PartCategory.java
@@ -0,0 +1,24 @@
+package com.codigoparallevar.minicards.toolbox;
+
+import com.codigoparallevar.minicards.PartInstantiator;
+import com.codigoparallevar.minicards.types.functional.Tuple2;
+
+import java.util.List;
+
+class PartCategory {
+    private final String _name;
+    private final List<Tuple2<String, PartInstantiator>> _parts;
+
+    public PartCategory(String name, List<Tuple2<String, PartInstantiator>> parts) {
+        this._name = name;
+        this._parts = parts;
+    }
+
+    public String getName() {
+        return _name;
+    }
+
+    public List<Tuple2<String, PartInstantiator>> getParts() {
+        return this._parts;
+    }
+}
diff --git a/app/src/main/java/com/codigoparallevar/minicards/toolbox/PartsHolder.java b/app/src/main/java/com/codigoparallevar/minicards/toolbox/PartsHolder.java
new file mode 100644
index 0000000..4d27846
--- /dev/null
+++ b/app/src/main/java/com/codigoparallevar/minicards/toolbox/PartsHolder.java
@@ -0,0 +1,132 @@
+package com.codigoparallevar.minicards.toolbox;
+
+import android.app.Dialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import androidx.appcompat.app.AlertDialog;
+import android.util.Log;
+
+import com.codigoparallevar.minicards.CanvasView;
+import com.codigoparallevar.minicards.PartInstantiator;
+import com.codigoparallevar.minicards.parts.buttons.RoundButton;
+import com.codigoparallevar.minicards.parts.logic.Ticker;
+import com.codigoparallevar.minicards.parts.logic.Toggle;
+import com.codigoparallevar.minicards.parts.samples.ColorBox;
+import com.codigoparallevar.minicards.parts.strings.ConvertToString;
+import com.codigoparallevar.minicards.types.Part;
+import com.codigoparallevar.minicards.types.functional.Tuple2;
+import com.programaker.api.data.ProgramakerBridgeInfo;
+import com.programaker.api.data.ProgramakerCustomBlock;
+import com.programaker.api.data.api_results.ProgramakerBridgeCustomBlockResult;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Vector;
+
+public class PartsHolder {
+    private final Context context;
+
+    private final static List<Tuple2<String, PartInstantiator>> BuiltInParts =
+            new Vector<Tuple2<String, PartInstantiator>>(){{
+                add(new Tuple2<>("Round button", RoundButton.getInstantiator()));
+                add(new Tuple2<>("Ticker", Ticker.getInstantiator()));
+                add(new Tuple2<>("Red/Green box", ColorBox.getInstantiator()));
+                add(new Tuple2<>("Toggle", Toggle.getInstantiator()));
+                add(new Tuple2<>("ToString", ConvertToString.getInstantiator()));
+    }};
+
+    private final static List<PartCategory> Categories = new Vector<PartCategory>() {{
+        add(new PartCategory("Testing", BuiltInParts));
+    }};
+    private Map<String, ProgramakerBridgeInfo> bridgeInfoMap;
+
+    public PartsHolder(Context context) {
+        this.context = context;
+    }
+
+    public void openAddPartModal(final CanvasView canvasView) {
+        AlertDialog.Builder builder = new AlertDialog.Builder(context);
+        Map<String, PartCategory> categoryOptions = getPartCategories();
+        String[] categoryNames = categoryOptions.keySet().toArray(new String[0]);
+
+        builder.setTitle("Choose part category")
+                .setItems(categoryNames, new DialogInterface.OnClickListener() {
+                    public void onClick(DialogInterface dialog, int whichCategory) {
+                        if ((whichCategory >= 0) && (whichCategory < categoryNames.length)){
+                            Map<String, PartInstantiator> parts = getPartTypes(categoryOptions.get(categoryNames[whichCategory]));
+                            String[] partNames = parts.keySet().toArray(new String[0]);
+
+                            builder.setTitle("Choose part type")
+                                    .setItems(partNames, (dialog1, whichPart) -> {
+                                        if ((whichPart >= 0) && (whichPart < partNames.length)) {
+                                            String partName = partNames[whichPart];
+
+                                            Log.d("Minicards partsHolder",
+                                                    "Spawning " + partName);
+
+                                            PartInstantiator instantiator = parts.get(partName);
+                                            PartsHolder.this.runInstantiator(instantiator, canvasView);
+                                        }
+                                    });
+
+                            Dialog dialog2 = builder.create();
+                            dialog2.show();
+                        }
+                    }
+                });
+
+        Dialog dialog = builder.create();
+        dialog.show();
+    }
+
+    private void runInstantiator(PartInstantiator instantiator, CanvasView canvasView) {
+        Part part = instantiator.build(canvasView);
+        canvasView.addPart(part);
+    }
+
+    private static Map<String,PartCategory> getPartCategories() {
+        Map<String, PartCategory> partTypes = new LinkedHashMap<>(Categories.size());
+        for (int i = 0; i < Categories.size(); i++){
+            partTypes.put(Categories.get(i).getName(), Categories.get(i));
+        }
+
+        return partTypes;
+    }
+
+    private static Map<String, PartInstantiator> getPartTypes(PartCategory categoryOption) {
+        HashMap<String, PartInstantiator> partMap = new LinkedHashMap<>();
+
+        for (Tuple2<String, PartInstantiator> part : categoryOption.getParts()) {
+            partMap.put(part.item1, part.item2);
+        }
+
+        return partMap;
+    }
+
+    public void addCustomBlocks(List<ProgramakerBridgeInfo> bridgeInfo, List<ProgramakerBridgeCustomBlockResult> customBlocks) {
+        Map<String, ProgramakerBridgeInfo> bridgeInfoMap = new LinkedHashMap<>();
+        for (ProgramakerBridgeInfo info : bridgeInfo) {
+            bridgeInfoMap.put(info.getId(), info);
+        }
+
+        this.bridgeInfoMap = bridgeInfoMap;
+
+        for (ProgramakerBridgeCustomBlockResult res : customBlocks) {
+
+            List<Tuple2<String, PartInstantiator>> parts = new LinkedList<>();
+            for (ProgramakerCustomBlock block : res.getBlocks()) {
+                parts.add(new Tuple2<>(block.getMessage(), new ProgramakerCustomBlockInstantiator(block)));
+            }
+
+            if (bridgeInfoMap.containsKey(res.getBridge_id())) {
+                Categories.add(new PartCategory(bridgeInfoMap.get(res.getBridge_id()).getName(), parts));
+            }
+            else {
+                Categories.add(new PartCategory("Bridge ID="+res.getBridge_id(), parts));
+            }
+        }
+    }
+}
diff --git a/app/src/main/java/com/codigoparallevar/minicards/toolbox/ProgramakerCustomBlockInstantiator.java b/app/src/main/java/com/codigoparallevar/minicards/toolbox/ProgramakerCustomBlockInstantiator.java
new file mode 100644
index 0000000..e08bb39
--- /dev/null
+++ b/app/src/main/java/com/codigoparallevar/minicards/toolbox/ProgramakerCustomBlockInstantiator.java
@@ -0,0 +1,22 @@
+package com.codigoparallevar.minicards.toolbox;
+
+import com.codigoparallevar.minicards.PartInstantiator;
+import com.codigoparallevar.minicards.parts.ProgramakerCustomBlockPart;
+import com.codigoparallevar.minicards.parts.buttons.RoundButton;
+import com.codigoparallevar.minicards.types.Part;
+import com.codigoparallevar.minicards.types.PartGrid;
+import com.codigoparallevar.minicards.types.functional.Tuple2;
+import com.programaker.api.data.ProgramakerCustomBlock;
+
+class ProgramakerCustomBlockInstantiator extends PartInstantiator {
+    private final ProgramakerCustomBlock _block;
+
+    public ProgramakerCustomBlockInstantiator(ProgramakerCustomBlock block) {
+        this._block = block;
+    }
+
+    @Override
+    protected Part instantiate(PartGrid grid, Tuple2<Integer, Integer> center) {
+        return new ProgramakerCustomBlockPart(grid, center, this._block);
+    }
+}
diff --git a/app/src/main/java/com/codigoparallevar/minicards/ui_helpers/GetAsync.java b/app/src/main/java/com/codigoparallevar/minicards/ui_helpers/GetAsync.java
index d38688b..500b17e 100644
--- a/app/src/main/java/com/codigoparallevar/minicards/ui_helpers/GetAsync.java
+++ b/app/src/main/java/com/codigoparallevar/minicards/ui_helpers/GetAsync.java
@@ -6,24 +6,31 @@ import android.util.Log;
 import com.codigoparallevar.minicards.types.functional.Consumer;
 import com.codigoparallevar.minicards.types.functional.Producer;
 import com.codigoparallevar.minicards.types.functional.Tuple2;
+import com.codigoparallevar.minicards.types.functional.Tuple3;
 
-public class GetAsync<T> extends AsyncTask<Tuple2<Producer<T>, Consumer<T>>,
+public class GetAsync<T> extends AsyncTask<Tuple3<Producer<T>, Consumer<T>, Consumer<Throwable>>,
         Void,
         Tuple2<T, Consumer<T>>> {
 
     @Override
-    protected Tuple2<T, Consumer<T>> doInBackground(Tuple2<Producer<T>, Consumer<T>>... data) {
+    protected Tuple2<T, Consumer<T>> doInBackground(Tuple3<Producer<T>, Consumer<T>, Consumer<Throwable>>... data) {
         try {
-            return new Tuple2<>(data[0].item1.get(), data[0].item2);
+            T result = data[0]._x.get();
+            return new Tuple2<>(result, data[0]._y);
         }
-        catch (Exception ex) {
-            Log.e("GetAsync", ex.toString());
-            return new Tuple2<>(null, data[0].item2);
+        catch (Throwable ex) {
+            data[0]._z.apply(ex);
+            return null;
         }
     }
 
     @Override
     protected void onPostExecute(Tuple2<T, Consumer<T>> result) {
-        result.item2.apply(result.item1);
+        if (result == null) {
+            return;
+        }
+        else {
+            result.item2.apply(result.item1);
+        }
     }
 }
diff --git a/app/src/main/java/com/programaker/api/ProgramakerApi.kt b/app/src/main/java/com/programaker/api/ProgramakerApi.kt
index 3bb4a90..d8a70f0 100644
--- a/app/src/main/java/com/programaker/api/ProgramakerApi.kt
+++ b/app/src/main/java/com/programaker/api/ProgramakerApi.kt
@@ -4,11 +4,9 @@ import android.os.Build
 import android.util.Log
 import com.google.gson.Gson
 import com.google.gson.GsonBuilder
+import com.programaker.api.data.ProgramakerBridgeInfo
 import com.programaker.api.data.ProgramakerCustomBlock
-import com.programaker.api.data.api_results.ProgramakerCheckResult
-import com.programaker.api.data.api_results.ProgramakerGetCustomBlocksResult
-import com.programaker.api.data.api_results.ProgramakerGetCustomBlocksResultTypeAdapter
-import com.programaker.api.data.api_results.ProgramakerLoginResult
+import com.programaker.api.data.api_results.*
 import com.programaker.api.exceptions.ProgramakerLoginRequiredException
 import com.programaker.api.exceptions.ProgramakerProtocolException
 import com.programaker.api.exceptions.TokenNotFoundException
@@ -84,7 +82,7 @@ class ProgramakerApi(private val ApiRoot: String="https://programaker.com/api")
         return result.token
     }
 
-    fun fetchCustomBlocks(): ProgramakerGetCustomBlocksResult {
+    fun fetchCustomBlocks(): List<ProgramakerBridgeCustomBlockResult> {
         val conn = URL(getCustomBlocksUrl()).openConnection() as HttpURLConnection
 
         addAuthHeader(conn)
@@ -106,7 +104,32 @@ class ProgramakerApi(private val ApiRoot: String="https://programaker.com/api")
             ex.logError(LogTag)
             throw ProgramakerProtocolException()
         }
-        return result
+        return result.result
+    }
+
+    fun fetchConnectedBridges(): List<ProgramakerBridgeInfo> {
+        val conn = URL(getConnectedBridgesUrl()).openConnection() as HttpURLConnection
+
+        addAuthHeader(conn)
+
+        val result: ProgramakerGetBridgeInfoResult
+
+        try {
+            val builder = GsonBuilder()
+            builder.registerTypeAdapter(ProgramakerGetBridgeInfoResult::class.java, ProgramakerGetBridgeInfoTypeAdapter())
+
+            val gson = builder.create()
+            val reader = InputStreamReader(conn.inputStream)
+
+            result = gson.fromJson(reader, ProgramakerGetBridgeInfoResult::class.java)
+        } catch(ex: JsonParseException) {
+            ex.logError(LogTag)
+            throw ProgramakerProtocolException()
+        } catch (ex: FileNotFoundException) {
+            ex.logError(LogTag)
+            throw ProgramakerProtocolException()
+        }
+        return result.result
     }
 
     // Initialization
@@ -128,6 +151,16 @@ class ProgramakerApi(private val ApiRoot: String="https://programaker.com/api")
     }
 
     private fun getCustomBlocksUrl(): String {
+        this.withUserName()
+        return "$ApiRoot/v0/users/$userName/custom-blocks/"
+    }
+
+    private fun getConnectedBridgesUrl(): String {
+        this.withUserName()
+        return "$ApiRoot/v0/users/$userName/bridges/"
+    }
+
+    private fun withUserName() {
         if (userName == null) {
             if (token == null) {
                 throw ProgramakerLoginRequiredException()
@@ -138,8 +171,6 @@ class ProgramakerApi(private val ApiRoot: String="https://programaker.com/api")
                 throw ProgramakerProtocolException()
             }
         }
-
-        return "$ApiRoot/v0/users/$userName/custom-blocks/"
     }
 
     private fun addAuthHeader(conn: URLConnection) {
diff --git a/app/src/main/java/com/programaker/api/data/ProgramakerBridgeInfo.kt b/app/src/main/java/com/programaker/api/data/ProgramakerBridgeInfo.kt
new file mode 100644
index 0000000..422fde0
--- /dev/null
+++ b/app/src/main/java/com/programaker/api/data/ProgramakerBridgeInfo.kt
@@ -0,0 +1,9 @@
+package com.programaker.api.data
+
+class ProgramakerBridgeInfo (
+   val id: String,
+   val name: String
+   // val is_connected: boolean
+   // val icon: Map<String, Object>
+) {
+}
diff --git a/app/src/main/java/com/programaker/api/data/api_results/ProgramakerGetBridgeInfoResult.kt b/app/src/main/java/com/programaker/api/data/api_results/ProgramakerGetBridgeInfoResult.kt
new file mode 100644
index 0000000..6cb00bb
--- /dev/null
+++ b/app/src/main/java/com/programaker/api/data/api_results/ProgramakerGetBridgeInfoResult.kt
@@ -0,0 +1,6 @@
+package com.programaker.api.data.api_results
+
+import com.programaker.api.data.ProgramakerBridgeInfo
+
+internal class ProgramakerGetBridgeInfoResult(val result: List<ProgramakerBridgeInfo>) {
+}
diff --git a/app/src/main/java/com/programaker/api/data/api_results/ProgramakerGetBridgeInfoTypeAdapter.kt b/app/src/main/java/com/programaker/api/data/api_results/ProgramakerGetBridgeInfoTypeAdapter.kt
new file mode 100644
index 0000000..fc77ec8
--- /dev/null
+++ b/app/src/main/java/com/programaker/api/data/api_results/ProgramakerGetBridgeInfoTypeAdapter.kt
@@ -0,0 +1,28 @@
+package com.programaker.api.data.api_results
+
+import com.google.gson.*
+import com.programaker.api.data.ProgramakerBridgeInfo
+import com.programaker.api.data.ProgramakerCustomBlock
+import java.lang.reflect.Type
+import java.util.*
+
+internal class ProgramakerGetBridgeInfoTypeAdapter : JsonSerializer<ProgramakerGetBridgeInfoResult?>, JsonDeserializer<ProgramakerGetBridgeInfoResult> {
+    var gson = Gson()
+    override fun serialize(customBlock: ProgramakerGetBridgeInfoResult?, typeOfT: Type, context: JsonSerializationContext): JsonElement {
+        throw NotImplementedError()
+    }
+
+    @Throws(JsonParseException::class)
+    override fun deserialize(element: JsonElement, typeOfT: Type, context: JsonDeserializationContext): ProgramakerGetBridgeInfoResult {
+        val array = element.asJsonArray
+        val bridges: MutableList<ProgramakerBridgeInfo> = LinkedList()
+
+        for (value in array) {
+
+            val bridge = gson.fromJson(value, ProgramakerBridgeInfo::class.java)
+            bridges.add(bridge)
+        }
+
+        return ProgramakerGetBridgeInfoResult(bridges)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/programaker/api/data/api_results/ProgramakerGetCustomBlocksResult.kt b/app/src/main/java/com/programaker/api/data/api_results/ProgramakerGetCustomBlocksResult.kt
index aa7dbce..07801a9 100644
--- a/app/src/main/java/com/programaker/api/data/api_results/ProgramakerGetCustomBlocksResult.kt
+++ b/app/src/main/java/com/programaker/api/data/api_results/ProgramakerGetCustomBlocksResult.kt
@@ -1,4 +1,4 @@
 package com.programaker.api.data.api_results
 
-class ProgramakerGetCustomBlocksResult(val result: List<ProgramakerBridgeCustomBlockResult>) {
+internal class ProgramakerGetCustomBlocksResult(val result: List<ProgramakerBridgeCustomBlockResult>) {
 }
diff --git a/app/src/main/java/com/programaker/api/data/api_results/ProgramakerGetCustomBlocksResultTypeAdapter.kt b/app/src/main/java/com/programaker/api/data/api_results/ProgramakerGetCustomBlocksResultTypeAdapter.kt
index c287f23..4344b42 100644
--- a/app/src/main/java/com/programaker/api/data/api_results/ProgramakerGetCustomBlocksResultTypeAdapter.kt
+++ b/app/src/main/java/com/programaker/api/data/api_results/ProgramakerGetCustomBlocksResultTypeAdapter.kt
@@ -5,7 +5,7 @@ import com.programaker.api.data.ProgramakerCustomBlock
 import java.lang.reflect.Type
 import java.util.*
 
-class ProgramakerGetCustomBlocksResultTypeAdapter : JsonSerializer<ProgramakerGetCustomBlocksResult?>, JsonDeserializer<ProgramakerGetCustomBlocksResult> {
+internal class ProgramakerGetCustomBlocksResultTypeAdapter : JsonSerializer<ProgramakerGetCustomBlocksResult?>, JsonDeserializer<ProgramakerGetCustomBlocksResult> {
     var gson = Gson()
     override fun serialize(customBlock: ProgramakerGetCustomBlocksResult?, typeOfT: Type, context: JsonSerializationContext): JsonElement {
         throw NotImplementedError()