bthrm - Allow scanning for sensors in settings

apps/bthrm/ChangeLog

@@ -20,3 +20,4 @@
 0.07: Recorder icon only blue if values actually arive
       Adds some preset modes and a custom one
       Restructure the settings menu
+0.08: Allow scanning for devices in settings

apps/bthrm/boot.js

@@ -23,7 +23,10 @@
     }
 
     function getCache(){
-      return require('Storage').readJSON("bthrm.cache.json", true) || {};
+      var cache = require('Storage').readJSON("bthrm.cache.json", true) || {};
+      if (settings.btname && settings.btname == cache.name) return cache;
+      clearCache();
+      return {};
     }
     
     function addNotificationHandler(characteristic){
@@ -361,7 +364,13 @@
       var promise;
       
       if (!device){
-        promise = NRF.requestDevice({ filters: serviceFilters });
+        var filters = serviceFilters;
+        if (settings.btname){
+          log("Configured device name", settings.btname);
+          filters = [{name: settings.btname}];
+        }
+        log("Requesting device with filters", filters);
+        promise = NRF.requestDevice({ filters: filters });
         
         if (settings.gracePeriodRequest){
           log("Add " + settings.gracePeriodRequest + "ms grace period after request");
@@ -488,11 +497,15 @@
         if (gatt) {
           if (gatt.connected){
             log("Disconnect with gatt: ", gatt);
+            try{
               gatt.disconnect().then(()=>{
                 log("Successful disconnect");
               }).catch((e)=>{
-              log("Error during disconnect", e);
+                log("Error during disconnect promise", e);
               });
+            } catch (e){
+              log("Error during disconnect attempt", e);
+            }
           }
         }
       }

apps/bthrm/metadata.json

@@ -2,7 +2,7 @@
   "id": "bthrm",
   "name": "Bluetooth Heart Rate Monitor",
   "shortName": "BT HRM",
-  "version": "0.07",
+  "version": "0.08",
   "description": "Overrides Bangle.js's build in heart rate monitor with an external Bluetooth one.",
   "icon": "app.png",
   "type": "app",

apps/bthrm/settings.js

@@ -17,6 +17,7 @@
   var settings;
   readSettings();
 
+  function buildMainMenu(){
     var mainmenu = {
       '': { 'title': 'Bluetooth HRM' },
       '< Back': back,
@@ -57,14 +58,32 @@
           }
           writeSettings("mode",v);
         }
-    },
+      }
-    'Custom Mode': function() { E.showMenu(submenu_custom); },
-    'Debug': function() { E.showMenu(submenu_debug); }
     };
 
+    if (settings.btname){
+      var name = "Clear " + settings.btname;
+      mainmenu[name] = function() {
+      E.showPrompt("Clear current device name?").then((r)=>{
+          if (r) {
+            writeSettings("btname",undefined);
+          }
+          E.showMenu(buildMainMenu());
+        });
+      };
+    }
+
+    mainmenu["BLE Scan"] = ()=> createMenuFromScan();
+    mainmenu["Custom Mode"] = function() { E.showMenu(submenu_custom); };
+    mainmenu.Debug = function() { E.showMenu(submenu_debug); };
+    return mainmenu;
+  }
+  
+
+  
   var submenu_debug = {
     '' : { title: "Debug"},
-    '< Back': function() { E.showMenu(mainmenu); },
+    '< Back': function() { E.showMenu(buildMainMenu()); },
     'Alert on disconnect': {
       value: !!settings.warnDisconnect,
       format: v => settings.warnDisconnect ? "On" : "Off",
@@ -82,9 +101,40 @@
     'Grace periods': function() { E.showMenu(submenu_grace); }
   };
 
+  function createMenuFromScan(){
+    E.showMenu();
+    E.showMessage("Scanning");
+
+    var submenu_scan = {
+      '' : { title: "Scan"},
+      '< Back': function() { E.showMenu(buildMainMenu()); }
+    };
+    var packets=10;
+    var scanStart=Date.now();
+    NRF.setScan(function(d) {
+      packets--;
+      if (packets<=0 || Date.now() - scanStart > 5000){
+        NRF.setScan();
+        E.showMenu(submenu_scan);
+      } else if (d.name){
+        print("Found device", d);
+        submenu_scan[d.name] = function(){
+          E.showPrompt("Set "+d.name+"?").then((r)=>{
+          if (r) {
+            writeSettings("btname",d.name);
+          }
+          E.showMenu(buildMainMenu());
+        });
+        };
+      }
+    }, { filters: [{services: [ "180d" ]}]});
+  }
+  
+
+  
   var submenu_custom = {
     '' : { title: "Custom mode"},
-    '< Back': function() { E.showMenu(mainmenu); },
+    '< Back': function() { E.showMenu(buildMainMenu()); },
     'Replace HRM': {
       value: !!settings.custom_replace,
       format: v => settings.custom_replace ? "On" : "Off",
@@ -165,7 +215,7 @@
   
   var submenu = {
     '' : { title: "Grace periods"},
-    '< Back': function() { E.showMenu(mainmenu); },
+    '< Back': function() { E.showMenu(buildMainMenu()); },
     'Request': {
       value: settings.gracePeriodRequest,
       min: 0,
@@ -208,5 +258,5 @@
     }
   };
   
-  E.showMenu(mainmenu);
+  E.showMenu(buildMainMenu());
 })