Add BLE scanner app

apps/blescanner/ChangeLog

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+0.01: New App!

apps/blescanner/app-icon.js

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+require("heatshrink").decompress(atob("mEwwhC/AH4ARkQAHBwsBiIACiAHBgQXIkAXJiIuKGAwWEC4cjmYABn//AAMyC63yC653FC6HwC5aQBC5ybIC44WChGAWxMgC44rCxGIZxYXFIoYXBGAQNCAAQXILYYXBGAUDBoK0EC5AsBC4QwEC5wAEC853BhAWDI6CPCFwp3OX4ouCC8xHXCAJ3VX94XCwBHVGIiPTU4oNCAAQWBX5gDBgQRCAAoXGGAUIFwQXHkAXHJIgABCw4IBC5sAiIAEiAgHAAQXLHBAYIC+6wJQYIADgIXGGBJ3FC4iOBAH4A/ACAA=="))

apps/blescanner/app.js

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+E.showMessage("Scanning...");
+var devices = [];
+
+setInterval(function() {
+  NRF.findDevices(function(devs) {
+    devs.forEach(dev=>{
+      var existing = devices.find(d=>d.id==dev.id);
+      if (existing) {
+        existing.timeout = 0;
+        existing.rssi = (existing.rssi*3 + dev.rssi)/4;
+      } else {
+        dev.timeout = 0;
+        dev.new = 0;
+        devices.push(dev);
+      }
+    });
+    devices.forEach(d=>{d.timeout++;d.new++});
+    devices = devices.filter(dev=>dev.timeout<8);
+    devices.sort((a,b)=>b.rssi - a.rssi);
+    g.clear(1).setFont("12x20");
+    var wasNew = false;
+    devices.forEach((d,y)=>{
+      y*=20;
+      var n = d.name;
+      if (!n) n=d.id.substr(0,22);
+      if (d.new<4) {
+        g.fillRect(0,y,g.getWidth(),y+19);
+        g.setColor(g.theme.bg);
+        if (d.rssi > -70) wasNew = true;
+      } else {
+        g.setColor(g.theme.fg);
+      }
+      g.setFontAlign(-1,-1);
+      g.drawString(n,0,y);
+      g.setFontAlign(1,-1);
+      g.drawString(0|d.rssi,g.getWidth()-1,y);
+    });
+    g.flip();
+    Bangle.setLCDBrightness(wasNew);
+  }, 1200);
+}, 1500);

apps/blescanner/metadata.json

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+{ "id": "blescanner",
+  "name": "BLE Scanner",
+  "shortName":"BLE Scan",
+  "version":"0.01",
+  "description": "Scans for bluetooth devices nearby and shows their names on the screen ordered by signal strength. The most recently discovered items are highlighted.",
+  "icon": "app.png",
+  "screenshots" : [ { "url":"screenshot.png" } ],
+  "tags": "tool,bluetooth",
+  "supports" : ["BANGLEJS2"],
+  "storage": [
+    {"name":"blescanner.app.js","url":"app.js"},
+    {"name":"blescanner.img","url":"app-icon.js","evaluate":true}
+  ]
+}