diff --git a/src/extensions/scratch3_microbit/index.js b/src/extensions/scratch3_microbit/index.js
index f5f0da524..f0115135a 100644
--- a/src/extensions/scratch3_microbit/index.js
+++ b/src/extensions/scratch3_microbit/index.js
@@ -73,6 +73,8 @@ class MicroBit {
         this._ble = null;
         this._runtime.registerPeripheralExtension(extensionId, this);
 
+        this._extensionId = extensionId;
+
         /**
          * The most recently received value for each sensor.
          * @type {Object.<string, number>}
@@ -132,6 +134,15 @@ class MicroBit {
         this.disconnect = this.disconnect.bind(this);
         this._onConnect = this._onConnect.bind(this);
         this._onMessage = this._onMessage.bind(this);
+
+        this._runtime.emit(this._runtime.constructor.PERIPHERAL_ERROR, {
+            message: `Scratch lost connection to peripheral.`,
+            extensionId: this._extensionId
+        });
+        this._runtime.emit(this._runtime.constructor.PERIPHERAL_ERROR, {
+            message: `Scratch lost connection to peripheral.`,
+            extensionId: 2
+        });
     }
 
     /**
@@ -200,7 +211,7 @@ class MicroBit {
      * Called by the runtime when user wants to scan for a peripheral.
      */
     scan () {
-        this._ble = new BLE(this._runtime, 'micro:bit', {
+        this._ble = new BLE(this._runtime, this._extensionId, {
             filters: [
                 {services: [BLEUUID.service]}
             ]
diff --git a/src/io/ble.js b/src/io/ble.js
index 60f5277a8..f5a681ba8 100644
--- a/src/io/ble.js
+++ b/src/io/ble.js
@@ -8,11 +8,11 @@ class BLE extends JSONRPCWebSocket {
      * A BLE peripheral socket object.  It handles connecting, over web sockets, to
      * BLE peripherals, and reading and writing data to them.
      * @param {Runtime} runtime - the Runtime for sending/receiving GUI update events.
-     * @param {string} peripheralType - the type of peripheral.
+     * @param {string} extensionId - the id of the extension using this socket.
      * @param {object} peripheralOptions - the list of options for peripheral discovery.
      * @param {object} connectCallback - a callback for connection.
      */
-    constructor (runtime, peripheralType, peripheralOptions, connectCallback) {
+    constructor (runtime, extensionId, peripheralOptions, connectCallback) {
         const ws = new WebSocket(ScratchLinkWebSocket);
         super(ws);
 
@@ -25,8 +25,8 @@ class BLE extends JSONRPCWebSocket {
         this._connectCallback = connectCallback;
         this._connected = false;
         this._characteristicDidChangeCallback = null;
+        this._extensionId = extensionId;
         this._peripheralOptions = peripheralOptions;
-        this._peripheralType = peripheralType;
         this._discoverTimeoutID = null;
         this._runtime = runtime;
     }
@@ -175,7 +175,8 @@ class BLE extends JSONRPCWebSocket {
         this.disconnect();
         // log.error(`BLE error: ${JSON.stringify(e)}`);
         this._runtime.emit(this._runtime.constructor.PERIPHERAL_ERROR, {
-            message: `Scratch lost connection to ${this._peripheralType}.`
+            message: `Scratch lost connection to ${this._peripheralType}.`,
+            extensionId: this._extensionId
         });
     }
 
diff --git a/src/io/bt.js b/src/io/bt.js
index ac8863d80..41438ec00 100644
--- a/src/io/bt.js
+++ b/src/io/bt.js
@@ -8,12 +8,12 @@ class BT extends JSONRPCWebSocket {
      * A BT peripheral socket object.  It handles connecting, over web sockets, to
      * BT peripherals, and reading and writing data to them.
      * @param {Runtime} runtime - the Runtime for sending/receiving GUI update events.
-     * @param {string} peripheralType - the type of peripheral.
+     * @param {string} extensionId - the id of the extension using this socket.
      * @param {object} peripheralOptions - the list of options for peripheral discovery.
      * @param {object} connectCallback - a callback for connection.
      * @param {object} messageCallback - a callback for message sending.
      */
-    constructor (runtime, peripheralType, peripheralOptions, connectCallback, messageCallback) {
+    constructor (runtime, extensionId, peripheralOptions, connectCallback, messageCallback) {
         const ws = new WebSocket(ScratchLinkWebSocket);
         super(ws);
 
@@ -26,8 +26,8 @@ class BT extends JSONRPCWebSocket {
         this._connectCallback = connectCallback;
         this._connected = false;
         this._characteristicDidChangeCallback = null;
+        this._extensionId = extensionId;
         this._peripheralOptions = peripheralOptions;
-        this._peripheralType = peripheralType;
         this._discoverTimeoutID = null;
         this._messageCallback = messageCallback;
         this._runtime = runtime;
diff --git a/src/virtual-machine.js b/src/virtual-machine.js
index e61ceaa6d..5be8a553c 100644
--- a/src/virtual-machine.js
+++ b/src/virtual-machine.js
@@ -111,8 +111,8 @@ class VirtualMachine extends EventEmitter {
         this.runtime.on(Runtime.PERIPHERAL_CONNECTED, () =>
             this.emit(Runtime.PERIPHERAL_CONNECTED)
         );
-        this.runtime.on(Runtime.PERIPHERAL_ERROR, message =>
-            this.emit(Runtime.PERIPHERAL_ERROR, message)
+        this.runtime.on(Runtime.PERIPHERAL_ERROR, data =>
+            this.emit(Runtime.PERIPHERAL_ERROR, data)
         );
         this.runtime.on(Runtime.PERIPHERAL_SCAN_TIMEOUT, () =>
             this.emit(Runtime.PERIPHERAL_SCAN_TIMEOUT)