Simple example to control an Espruino device by setting a characteristic on it

apps.json

@@ -751,5 +751,17 @@
       {"name":"*demoapp","url":"app-icon.js","evaluate":true}
     ],
     "sortorder" : -9
+  },
+  { "id": "flagrse",
+    "name": "Espruino Flag Raiser",
+    "icon": "app.png",
+    "description": "App to send a command to an Espruino-based bluetooth Flag",
+    "tags": "",
+    "storage": [
+      {"name":"+flagrse","url":"app.json"},
+      {"name":"-flagrse","url":"app.js"},
+      {"name":"*flagrse","url":"app-icon.js","evaluate":true}
+    ]
   }
+
 ]

apps/flagrse/app-icon.js

@@ -0,0 +1 @@
+require("heatshrink").decompress(atob("mEwxH+AH4A/AH4AJmUyF/4Adstl1ovvAAIvvGNQvGGNAvIGMwvKGMgvMGMQvOGMAvQGLwvSGLgvUGLQvWGLAvYGKwv/R+zvtFrAvUFrQvSFrgvQFrwvOFsAvMFsQvKFsgvIFswvGFtAvEFtQABmUyF1gv/F/4v/F/4v/F/4v/F/4A/AH4A/AAwA="))

apps/flagrse/app.js

@@ -0,0 +1,57 @@
+
+function redraw() {
+  var img = require("heatshrink").decompress(atob("sFgxH+AH4A/AH4A/AH4A/AH4A/AH4A/AH4A/ACcyAARD/L/5f/If5f/AHdlAAWtIn5ffAAJG/L75h/L8Jh/L8Jh/L8Jh/L8Jh/L8Jh/L8Jh/L8Jh/L8Jh/L8Jh/L8Jh/L8Jh/L8Jh/L8Jh+L8Rh8L8hh6L8xh4L9Bh2L9Rh0L9hhyL9xhwL+BhuL+RhsL+hhqL/5f/Lvpf0LtRfyLthfwLtxfuLuBfsLuRfqLuhfoLuxfmLvBfkLvRfiLvhfgLvxfeLn5fdLX5fdLH5fdK35fdKn5fdKX5fdKH5fdJ35fdJn5fdJX5fdJH5fdI35fdIn4AamQACIf5f/L/5D/L/5f/If5f/L/5D/L/5f/If5f/L/5D/L/5f/If5f/L/5D/L/5f/If5f/L/5D/L/5f/If5f/L/5D/L/4A/AH4A/AH4A/AH4A/AH4A/AH4A/AH4AnA"));
+  g.clear();
+  g.drawImage(img, 120-96, 120-96, {scale:2});
+}
+
+ // Code for button (Puck.js)
+ var busy = false;
+
+var lastTry = getTime();
+
+function flag() {
+  E.showMessage("Working...");
+  if (busy && lastTry+5<getTime()) busy=false;
+   lastTry = getTime();
+
+  if (busy) {
+    digitalPulse(LED1,1,[10,200,10,200,10]);
+    return;
+  }
+  busy = true;
+  var gatt;
+  NRF.requestDevice({ filters: [{ name: 'Flag' }] })
+  .then(function(device) {
+    console.log("Found");
+    return device.gatt.connect();
+  }).then(function(g) {
+    console.log("Connected");
+    gatt = g;
+    return gatt.getPrimaryService(
+        "3e440001-f5bb-357d-719d-179272e4d4d9");
+  }).then(function(service) {
+    console.log("Found service");
+    return service.getCharacteristic(
+        "3e440002-f5bb-357d-719d-179272e4d4d9");
+  }).then(function(characteristic) {
+    console.log("Found characteristic");
+    return characteristic.writeValue(1);
+  }).then(function() {
+    console.log("Found service");
+    gatt.disconnect();
+    console.log("Done!");
+    busy=false;
+    redraw();
+  }).catch(function(e) {
+    console.log("ERROR",e);
+    busy=false;
+    gatt.disconnect();
+    redraw();
+  });
+}
+
+setWatch(flag, BTN, {repeat:true});
+
+Bangle.on("touch", flag);
+redraw();

apps/flagrse/app.json

@@ -0,0 +1,5 @@
+{
+  "name":"Flag Raiser",
+  "icon":"*flagrse",
+  "src":"-flagrse"
+}