Add BLE Scanner app

apps.json

@@ -337,5 +337,17 @@
       {"name":".tfmodel","url":"gesture-tfmodel.js","evaluate":true},
       {"name":"*gesture","url":"gesture-icon.js","evaluate":true}
     ]
+  },
+  {
+    "id": "blescan",
+    "name": "BLE Scanner",
+    "icon": "blescan.png",
+    "description": "Scan for advertising BLE devices",
+    "tags" : "bluetooth",
+    "storage" : [
+      {"name":"+blescan","url":"blescan.json"},
+      {"name":"-blescan","url":"blescan.js"},
+      {"name":"*blescan","url":"blescan-icon.js", "evaluate":true}
+    ]
   }
 ]

apps/blescan-icon.js

@@ -0,0 +1 @@
+var img = require("heatshrink").decompress(atob("mEwxH+AH4A/AH4ATmIABrdbAgQrmAAYvEAAYtkF5QxcEZAvLGDAhJF5oxWFhYAFCBFaFzQsHAAk3CQmE1wwRFxiPFMY4uBwiSRI4uEQo4GIAAIVBxTCRFwoABJITvNrYTHRqIuCAAIvPxQSBBQwvQL6aMCBQ7sQVIQuGdIjqIGCIOEm4XHForqFIAYHBm4vTFxYMDAQKeHDIwvVRAoEDdRAvPE5QcHAoTqJDQ5eZAwS7DIZovWAodaRQLqGF6bhDABouCXYIAQF+6PUrQUQd7oMKF6wbLApYaIF45gSAgxeUF5olDBIICECJIvTm4wLAAoPHm4vTC4OK12EGJYLFI5IvJGAuE1wABGAycIBRQuKF4ouCAAIvPIgOFF6QwEL6c3IRAuMGA+EWw4GIwuusAuTeQzqGF4r0LF6AwIm4mEAA03FzAwJLAxbKFygwLd5IuaMRwthGBYvKFzQxJF5AtdGZAvEFcYA/AH4AvA=="))

apps/blescan.js

@@ -0,0 +1,52 @@
+// ble-scanner
+// Scan the airwaves every three seconds (which seems safe for a large number of devices)
+// Using the menu feature, display a scrollable list of BLE devices on the watch
+
+// Dummy menu item to display until we find something
+const NODEVICE = 'No devices found';
+
+const SCAN_INTERVAL = 3000;
+
+const menu = {
+};
+
+menu[NODEVICE] = {
+  value : "",
+  onchange : () => {}
+};
+
+  
+function draw() {
+  Bangle.menu(menu);
+}
+
+function scan() {
+  NRF.findDevices(devices => {
+      for (let device of devices) {
+
+        // Only display devices that advertise a name
+        
+        if (device.name) {
+          // Remove no devices found message if it is present
+          if (menu[NODEVICE]) {
+            delete menu[NODEVICE];
+          }
+          menu[device.name] = {
+            value : device.rssi,
+            onchange : () => {}
+          };
+        }
+      }
+      draw();
+  }, { active: true });
+}
+
+
+function waitMessage() {
+  E.showMessage('scanning');
+}
+
+scan();
+waitMessage();
+
+setInterval(scan, SCAN_INTERVAL);

apps/blescan.json

@@ -0,0 +1,7 @@
+  
+{
+  "name": "BLE Scanner",
+  "type":"app",
+  "icon": "*blescan",
+  "src": "-blescan"
+}