Passing custom alert messages with PERIPHERAL_ERROR.

src/extensions/scratch3_ev3/index.js

@@ -548,7 +548,7 @@ class EV3 {
      * Called by the runtime when user wants to scan for an EV3 peripheral.
      */
     scan () {
-        this._bt = new BT(this._runtime, {
+        this._bt = new BT(this._runtime, 'EV3', {
             majorDeviceClass: 8,
             minorDeviceClass: 1
         }, this._onConnect, this._onMessage);

src/extensions/scratch3_microbit/index.js

@@ -200,7 +200,7 @@ class MicroBit {
      * Called by the runtime when user wants to scan for a peripheral.
      */
     scan () {
-        this._ble = new BLE(this._runtime, {
+        this._ble = new BLE(this._runtime, 'micro:bit', {
             filters: [
                 {services: [BLEUUID.service]}
             ]

src/extensions/scratch3_wedo2/index.js

@@ -549,7 +549,7 @@ class WeDo2 {
      * Called by the runtime when user wants to scan for a WeDo 2.0 peripheral.
      */
     scan () {
-        this._ble = new BLE(this._runtime, {
+        this._ble = new BLE(this._runtime, 'WeDo 2', {
             filters: [{
                 services: [BLEService.DEVICE_SERVICE]
             }],

src/io/ble.js

@@ -8,10 +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 {object} peripheralOptions - the list of options for peripheral discovery.
      * @param {object} connectCallback - a callback for connection.
      */
-    constructor (runtime, peripheralOptions, connectCallback) {
+    constructor (runtime, peripheralType, peripheralOptions, connectCallback) {
         const ws = new WebSocket(ScratchLinkWebSocket);
         super(ws);
 
@@ -25,6 +26,7 @@ class BLE extends JSONRPCWebSocket {
         this._connected = false;
         this._characteristicDidChangeCallback = null;
         this._peripheralOptions = peripheralOptions;
+        this._peripheralType = peripheralType;
         this._discoverTimeoutID = null;
         this._runtime = runtime;
     }
@@ -172,7 +174,9 @@ class BLE extends JSONRPCWebSocket {
     _sendError (/* e */) {
         this.disconnect();
         // log.error(`BLE error: ${JSON.stringify(e)}`);
-        this._runtime.emit(this._runtime.constructor.PERIPHERAL_ERROR);
+        this._runtime.emit(this._runtime.constructor.PERIPHERAL_ERROR, {
+            message: `Scratch lost connection to ${this._peripheralType}.`
+        });
     }
 
     _sendDiscoverTimeout () {

src/io/bt.js

@@ -8,11 +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 {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, peripheralOptions, connectCallback, messageCallback) {
+    constructor (runtime, peripheralType, peripheralOptions, connectCallback, messageCallback) {
         const ws = new WebSocket(ScratchLinkWebSocket);
         super(ws);
 
@@ -26,6 +27,7 @@ class BT extends JSONRPCWebSocket {
         this._connected = false;
         this._characteristicDidChangeCallback = null;
         this._peripheralOptions = peripheralOptions;
+        this._peripheralType = peripheralType;
         this._discoverTimeoutID = null;
         this._messageCallback = messageCallback;
         this._runtime = runtime;
@@ -115,7 +117,9 @@ class BT extends JSONRPCWebSocket {
     _sendError (/* e */) {
         this.disconnect();
         // log.error(`BT error: ${JSON.stringify(e)}`);
-        this._runtime.emit(this._runtime.constructor.PERIPHERAL_ERROR);
+        this._runtime.emit(this._runtime.constructor.PERIPHERAL_ERROR, {
+            message: `Scratch lost connection to ${this._peripheralType}.`
+        });
     }
 
     _sendDiscoverTimeout () {

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, () =>
-            this.emit(Runtime.PERIPHERAL_ERROR)
+        this.runtime.on(Runtime.PERIPHERAL_ERROR, message =>
+            this.emit(Runtime.PERIPHERAL_ERROR, message)
         );
         this.runtime.on(Runtime.PERIPHERAL_SCAN_TIMEOUT, () =>
             this.emit(Runtime.PERIPHERAL_SCAN_TIMEOUT)