Merge branch 'master' of github.com:espruino/BangleApps

.github/ISSUE_TEMPLATE/bangle-bug-report-custom-form.yaml

@@ -0,0 +1,60 @@
+name: Bangle bug report
+description: "Bangle: Create a issue to help us improve!"
+title: "Short description and provide the affected app/widget"
+labels: ["bug"]
+assignees: []
+body:
+  - type: markdown
+    attributes:
+      value: |
+        # Attention: If you have a question then ask it at the [bangle forum](http://forum.espruino.com/microcosms/1424/), please!
+  - type: dropdown
+    id: hwversion
+    attributes:
+      label: Affected hardware version
+      description: |
+        Which Bangle hardware version(s) is/are affected?
+        _Hint: You can select multiple entries._
+      options:
+        - Bangle 1
+        - Bangle 2
+      multiple: true
+    validations:
+      required: true
+  - type: input
+    id: fwversion
+    attributes:
+      label: Your firmware version
+      description: |
+        ## Please make sure you installed the latest (released) firmware!
+        How to see FW version? Within the AppLoader at "More..."-page: Device info; via the "about"-app or the "firmware"-widget.
+        If the issue will occur in "Cutting Edge build" only, please mention this.
+        
+        FW Update instructions:
+        **Bangle 2: [firmware update instructions](https://www.espruino.com/Bangle.js2#firmware-updates)**
+        **Bangle 1: [firmware update instructions](https://www.espruino.com/Bangle.js#firmware-updates)**
+        _Hint: The links will open inplace hold e.g. ctrl/cmd-key and click to open in a new tab instead._
+      placeholder: e.g. 2v12
+    validations:
+      required: true
+  - type: textarea
+    id: report
+    attributes:
+      label: The bug
+      description: |
+        ## Please also mention the expected behaviour and steps to reproduce
+      placeholder: |
+        ###Describe the bug
+        A clear and concise description of what the bug is.
+        
+        ###Expected behavior
+        A clear and concise description of what you expected to happen.
+
+        ###Steps to reproduce
+        1. Start app xy
+        2. choose abc
+        3. bug occurs
+
+        It could be helpfull for us to provide the devopment folder in 'bangle apps' folder 
+    validations:
+      required: true

apps/bthrm/ChangeLog

@@ -7,3 +7,10 @@
       Show actual source of event in app
 0.04: Automatically reconnect BT sensor
       App buzzes if no BTHRM events for more than 3 seconds
+0.05: Allow reading additional data if available: HRM battery, position and RR
+      Better caching of scanned BT device properties
+      New setting for not starting the BTHRM together with HRM
+      Save some RAM by not defining functions if disabled in settings
+      Always emit BTHRM event
+      Cleanup promises code and allow to configure custom additional waiting times to work around bugs
+      Disconnect cleanly on exit

apps/bthrm/boot.js

@@ -1,218 +1,557 @@
 (function() {
-  //var sf = require("Storage").open("bthrm.log","a");
+  var settings = Object.assign(
+    require('Storage').readJSON("bthrm.default.json", true) || {},
+    require('Storage').readJSON("bthrm.json", true) || {}
+  );
+  
   var log = function(text, param){
-    /*var logline = Date.now().toFixed(3) + " - " + text;
+    if (settings.debuglog){
-    if (param){
+      var logline = new Date().toISOString() + " - " + text;
-      logline += " " + JSON.stringify(param);
+      if (param){
+        logline += " " + JSON.stringify(param);
+      }
+      print(logline);
     }
-    sf.write(logline + "\n");
-    print(logline);*/
-  }
-  
-  log("Start");
-  
-  var blockInit = false;
-  var gatt;
-  var currentRetryTimeout;
-  var initialRetryTime = 40;
-  var maxRetryTime = 60000;
-  var retryTime = initialRetryTime;
-  
-  var origIsHRMOn = Bangle.isHRMOn;
-  
-  Bangle.isBTHRMOn = function(){
-    return (gatt!==undefined && gatt.connected);
   };
   
-  Bangle.isHRMOn = function() {
+  log("Settings: ", settings);
-    var settings = require('Storage').readJSON("bthrm.json", true) || {};
   
-    if (settings.enabled && !settings.replace){
+  if (settings.enabled){
-        return origIsHRMOn();
-    } else if (settings.enabled && settings.replace){
-        return Bangle.isBTHRMOn();
-    }
-    return origIsHRMOn() || Bangle.isBTHRMOn();
-  };
 
-  var serviceFilters = [{
+    function clearCache(){
-    services: [
+      return require('Storage').erase("bthrm.cache.json");
-      "180d"
-    ]
-  }];
-
-  function retry(){
-    log("Retry with time " + retryTime);
-    if (currentRetryTimeout){
-      log("Clearing timeout " + currentRetryTimeout);
-      clearTimeout(currentRetryTimeout);
-      currentRetryTimeout = undefined;
     }
 
-    var clampedTime = retryTime < 200 ? 200 : initialRetryTime;
+    function getCache(){
-    currentRetryTimeout = setTimeout(() => {
+      return require('Storage').readJSON("bthrm.cache.json", true) || {};
-      log("Set timeout for retry as " + clampedTime);
-      initBt();
-    }, clampedTime);
-    
-    retryTime = Math.pow(retryTime, 1.1);
-    if (retryTime > maxRetryTime){
-      retryTime = maxRetryTime;
-    }
-  }
-
-  function onDisconnect(reason) {
-    log("Disconnect: " + reason);
-    log("Gatt: ", gatt);
-    retry();
-  }
-
-  function onCharacteristic(event) {
-    var settings = require('Storage').readJSON("bthrm.json", true) || {};
-    var dv = event.target.value;
-    var flags = dv.getUint8(0);
-    // 0 = 8 or 16 bit
-    // 1,2 = sensor contact
-    // 3 = energy expended shown
-    // 4 = RR interval
-    var bpm = (flags & 1) ? (dv.getUint16(1) / 100 /* ? */ ) : dv.getUint8(1); // 8 or 16 bit
-    /*  var idx = 2 + (flags&1); // index of next field
-    if (flags&8) idx += 2; // energy expended
-    if (flags&16) {
-      var interval = dv.getUint16(idx,1); // in milliseconds
-    }*/
-
-    Bangle.emit(settings.replace ? "HRM" : "BTHRM", {
-      bpm: bpm,
-      confidence: bpm == 0 ? 0 : 100,
-      src: settings.replace ? "bthrm" : undefined
-    });
-  }
-  
-  var reUseCounter=0;
-
-  function initBt() {
-    log("initBt with blockInit: " + blockInit);
-    if (blockInit){
-      retry();
-      return;
     }
     
-    blockInit = true;
+    function addNotificationHandler(characteristic){
+      log("Setting notification handler: " + supportedCharacteristics[characteristic.uuid].handler);
+      characteristic.on('characteristicvaluechanged', supportedCharacteristics[characteristic.uuid].handler);
+    }
     
-    var connectionPromise;
+    function writeCache(cache){
+      var oldCache = getCache();
+      if (oldCache != cache) {
+        log("Writing cache");
+        require('Storage').writeJSON("bthrm.cache.json", cache)
+      } else {
+        log("No changes, don't write cache");
+      }
       
-    if (reUseCounter > 3){
+    }
-      log("Reuse counter to high")
+
-      if (gatt.connected == true){
+    function characteristicsToCache(characteristics){
-        try {
+      log("Cache characteristics");
-          log("Force disconnect with gatt: ", gatt);
+      var cache = getCache();
-          gatt.disconnect();
+      if (!cache.characteristics) cache.characteristics = {};
-        } catch(e) {
+      for (var c of characteristics){
-          log("Error during force disconnect", e);
+        //"handle_value":16,"handle_decl":15
+        log("Saving handle " + c.handle_value + " for characteristic: ", c);
+        cache.characteristics[c.uuid] = {
+          "handle": c.handle_value,
+          "uuid": c.uuid,
+          "notify": c.properties.notify,
+          "read": c.properties.read
+        };
+      }
+      writeCache(cache);
+    }
+
+    function characteristicsFromCache(){
+      log("Read cached characteristics");
+      var cache = getCache();
+      if (!cache.characteristics) return [];
+      var restored = [];
+      for (var c in cache.characteristics){
+        var cached = cache.characteristics[c];
+        var r = new BluetoothRemoteGATTCharacteristic();
+        log("Restoring characteristic ", cached);
+        r.handle_value = cached.handle;
+        r.uuid = cached.uuid;
+        r.properties = {};
+        r.properties.notify = cached.notify;
+        r.properties.read = cached.read;
+        addNotificationHandler(r);
+        log("Restored characteristic: ", r);
+        restored.push(r);
+      }
+      return restored;
+    }
+
+    log("Start");
+
+    var lastReceivedData={
+    };
+
+    var serviceFilters = [{
+      services: [ "180d" ]
+    }];
+
+    supportedServices = [
+      "0x180d", "0x180f"
+    ];
+
+    var supportedCharacteristics = {
+      "0x2a37": {
+        //Heart rate measurement
+        handler: function (event){          
+          var dv = event.target.value;
+          var flags = dv.getUint8(0);
+          
+          var bpm = (flags & 1) ? (dv.getUint16(1) / 100 /* ? */ ) : dv.getUint8(1); // 8 or 16 bit
+          
+          var sensorContact;
+          
+          if (flags & 2){
+            sensorContact = (flags & 4) ? true : false;
+          }
+          
+          var idx = 2 + (flags&1);
+          
+          var energyExpended;
+          if (flags & 8){
+            energyExpended = dv.getUint16(idx,1);
+            idx += 2;
+          }
+          var interval;
+          if (flags & 16) {
+            interval = [];
+            maxIntervalBytes = (dv.byteLength - idx);
+            log("Found " + (maxIntervalBytes / 2) + " rr data fields");
+            for(var i = 0 ; i < maxIntervalBytes / 2; i++){
+              interval[i] = dv.getUint16(idx,1); // in milliseconds
+              idx += 2
+            }
+          }
+
+          var location;
+          if (lastReceivedData && lastReceivedData["0x180d"] && lastReceivedData["0x180d"]["0x2a38"]){
+            location = lastReceivedData["0x180d"]["0x2a38"];
+          }
+
+          var battery;
+          if (lastReceivedData && lastReceivedData["0x180f"] && lastReceivedData["0x180f"]["0x2a19"]){
+            battery = lastReceivedData["0x180f"]["0x2a19"];
+          }
+
+          if (settings.replace){
+            var newEvent = {
+              bpm: bpm,
+              confidence: (sensorContact || sensorContact === undefined)? 100 : 0,
+              src: "bthrm"
+            };
+          
+            log("Emitting HRM: ", newEvent);
+            Bangle.emit("HRM", newEvent);
+          }
+
+          var newEvent = {
+            bpm: bpm
+          };
+          
+          if (location) newEvent.location = location;
+          if (interval) newEvent.rr = interval;
+          if (energyExpended) newEvent.energy = energyExpended;
+          if (battery) newEvent.battery = battery;
+          if (sensorContact) newEvent.contact = sensorContact;
+          
+          log("Emitting BTHRM: ", newEvent);
+          Bangle.emit("BTHRM", newEvent);
+        }
+      },
+      "0x2a38": {
+        //Body sensor location
+        handler: function(data){
+          if (!lastReceivedData["0x180d"]) lastReceivedData["0x180d"] = {};
+          if (!lastReceivedData["0x180d"]["0x2a38"]) lastReceivedData["0x180d"]["0x2a38"] = data.target.value;
+        }
+      },
+      "0x2a19": {
+        //Battery
+        handler: function (event){
+          if (!lastReceivedData["0x180f"]) lastReceivedData["0x180f"] = {};
+          if (!lastReceivedData["0x180f"]["0x2a19"]) lastReceivedData["0x180f"]["0x2a19"] = event.target.value.getUint8(0);
         }
       }
-      gatt=undefined;
-      reUseCounter = 0;
-    }
 
-    if (!gatt){
+    };
-      var requestPromise = NRF.requestDevice({ filters: serviceFilters });
+
-      connectionPromise = requestPromise.then(function(device) {
+    var device;
-        gatt = device.gatt;
+    var gatt;
-        log("Gatt after request:", gatt);
+    var characteristics = [];
-        gatt.device.on('gattserverdisconnected', onDisconnect);
+    var blockInit = false;
+    var currentRetryTimeout;
+    var initialRetryTime = 40;
+    var maxRetryTime = 60000;
+    var retryTime = initialRetryTime;
+
+    var connectSettings = {
+      minInterval: 7.5,
+      maxInterval: 1500
+    };
+
+    function waitingPromise(timeout) {
+      return new Promise(function(resolve){
+        log("Start waiting for " + timeout);
+        setTimeout(()=>{
+          log("Done waiting for " + timeout);
+          resolve();
+        }, timeout);
       });
-    } else {
+    }
-      reUseCounter++;
+
-      log("Reusing gatt:", gatt);
+    if (settings.enabled){
-      connectionPromise = gatt.connect();
+      Bangle.isBTHRMOn = function(){
+        return (Bangle._PWR && Bangle._PWR.BTHRM && Bangle._PWR.BTHRM.length > 0);
+      };
+
+      Bangle.isBTHRMConnected = function(){
+        return gatt && gatt.connected;
+      };
     }
 
 
-    var servicePromise = connectionPromise.then(function() {
+    if (settings.replace){
-      return gatt.getPrimaryService(0x180d);
+      var origIsHRMOn = Bangle.isHRMOn;
-    });
 
-    var characteristicPromise = servicePromise.then(function(service) {
+      Bangle.isHRMOn = function() {
-      log("Got service:", service);
+        if (settings.enabled && !settings.replace){
-      return service.getCharacteristic(0x2A37);
+            return origIsHRMOn();
-    });
+        } else if (settings.enabled && settings.replace){
-
+            return Bangle.isBTHRMOn();
-    var notificationPromise = characteristicPromise.then(function(c) {
-      log("Got characteristic:", c);
-      c.on('characteristicvaluechanged', onCharacteristic);
-      return c.startNotifications();
-    });
-    notificationPromise.then(()=>{
-      log("Wait for notifications");
-      retryTime = initialRetryTime;
-      blockInit=false;
-    });
-    notificationPromise.catch((e) => {
-      log("Error:", e);
-      blockInit = false;
-      retry();
-    });
-  }
-  
-  
-  Bangle.setBTHRMPower = function(isOn, app) {
-    var settings = require('Storage').readJSON("bthrm.json", true) || {};
-  
-    // Do app power handling
-    if (!app) app="?";
-    if (Bangle._PWR===undefined) Bangle._PWR={};
-    if (Bangle._PWR.BTHRM===undefined) Bangle._PWR.BTHRM=[];
-    if (isOn && !Bangle._PWR.BTHRM.includes(app)) Bangle._PWR.BTHRM.push(app);
-    if (!isOn && Bangle._PWR.BTHRM.includes(app)) Bangle._PWR.BTHRM = Bangle._PWR.BTHRM.filter(a=>a!=app);
-    isOn = Bangle._PWR.BTHRM.length;
-    // so now we know if we're really on
-    if (isOn) {
-      if (!Bangle.isBTHRMOn()) {
-        initBt();
-      }
-    } else { // not on
-      log("Power off for " + app);
-      if (gatt) {
-        try {
-          log("Disconnect with gatt: ", gatt);
-          gatt.disconnect();
-        } catch(e) {
-          log("Error during disconnect", e);
         }
-        blockInit = false;
+        return origIsHRMOn() || Bangle.isBTHRMOn();
-        gatt = undefined;
+      };
+    }
+
+    function clearRetryTimeout(){
+      if (currentRetryTimeout){
+        log("Clearing timeout " + currentRetryTimeout);
+        clearTimeout(currentRetryTimeout);
+        currentRetryTimeout = undefined;
       }
     }
-  };
 
-  var origSetHRMPower = Bangle.setHRMPower;
+    function retry(){
+      log("Retry");
 
-  Bangle.setHRMPower = function(isOn, app) {
+      if (!currentRetryTimeout){
-    log("setHRMPower for " + app + ":" + (isOn?"on":"off"));
-    var settings = require('Storage').readJSON("bthrm.json", true) || {};
-    if (settings.enabled || !isOn){
-      log("Enable BTHRM power");
-      Bangle.setBTHRMPower(isOn, app);
-    }
-    if ((settings.enabled && !settings.replace) || !settings.enabled || !isOn){
-      log("Enable HRM power");
-      origSetHRMPower(isOn, app);
-    }
-  }
 
-  var settings = require('Storage').readJSON("bthrm.json", true) || {};
+        var clampedTime = retryTime < 100 ? 100 : retryTime;
-  if (settings.enabled && settings.replace){
+        
-    log("Replace HRM event");
+        log("Set timeout for retry as " + clampedTime);      
-    if (!(Bangle._PWR===undefined) && !(Bangle._PWR.HRM===undefined)){
+        clearRetryTimeout();
-      for (var i = 0; i < Bangle._PWR.HRM.length; i++){
+        currentRetryTimeout = setTimeout(() => {
-        var app = Bangle._PWR.HRM[i];
+          log("Retrying");
-        log("Moving app " + app);
+          currentRetryTimeout = undefined;
-        origSetHRMPower(0, app);
+          initBt();
-        Bangle.setBTHRMPower(1, app);
+        }, clampedTime);
-        if (Bangle._PWR.HRM===undefined) break;
+
+        retryTime = Math.pow(retryTime, 1.1);
+        if (retryTime > maxRetryTime){
+          retryTime = maxRetryTime;
+        }
+      } else {
+        log("Already in retry...");
       }
     }
+
+    var buzzing = false;
+    function onDisconnect(reason) {
+      log("Disconnect: " + reason);
+      log("GATT: ", gatt);
+      log("Characteristics: ", characteristics);
+      retryTime = initialRetryTime;
+      clearRetryTimeout();
+      switchInternalHrm();
+      blockInit = false;
+      if (settings.warnDisconnect && !buzzing){
+        buzzing = true;
+        Bangle.buzz(500,0.3).then(()=>waitingPromise(4500)).then(()=>{buzzing = false;});
+      }
+      if (Bangle.isBTHRMOn()){
+        retry();
+      }
+    }
+
+    function createCharacteristicPromise(newCharacteristic){
+      log("Create characteristic promise: ", newCharacteristic);
+      var result = Promise.resolve();
+      if (newCharacteristic.properties.notify){
+        result = result.then(()=>{
+          log("Starting notifications for: ", newCharacteristic);
+          var startPromise = newCharacteristic.startNotifications().then(()=>log("Notifications started for ", newCharacteristic));
+          if (settings.gracePeriodNotification > 0){
+            log("Add " + settings.gracePeriodNotification + "ms grace period after starting notifications");
+            startPromise = startPromise.then(()=>{
+              log("Wait after connect");
+              waitingPromise(settings.gracePeriodNotification)
+            });
+          }
+          return startPromise;
+        });
+      } else if (newCharacteristic.read){
+        result = result.then(()=>{
+          readData(newCharacteristic);
+          log("Reading data for " + newCharacteristic);
+          return newCharacteristic.read().then((data)=>{
+            supportedCharacteristics[newCharacteristic.uuid].handler(data);
+          });
+        });
+      }
+      return result.then(()=>log("Handled characteristic: ", newCharacteristic));
+    }
+    
+    function attachCharacteristicPromise(promise, characteristic){
+      return promise.then(()=>{
+        log("Handling characteristic:", characteristic);
+        return createCharacteristicPromise(characteristic);
+      });
+    }
+    
+    function createCharacteristicsPromise(newCharacteristics){
+      log("Create characteristics promise: ", newCharacteristics);
+      var result = Promise.resolve();
+      for (var c of newCharacteristics){
+        if (!supportedCharacteristics[c.uuid]) continue;
+        log("Supporting characteristic: ", c);
+        characteristics.push(c);
+        if (c.properties.notify){
+          addNotificationHandler(c);
+        }
+        
+        result = attachCharacteristicPromise(result, c);
+      }
+      return result.then(()=>log("Handled characteristics"));
+    }
+    
+    function createServicePromise(service){
+      log("Create service promise: ", service);
+      var result = Promise.resolve();
+      result = result.then(()=>{
+        log("Handling service: " + service.uuid);
+        return service.getCharacteristics().then((c)=>createCharacteristicsPromise(c));
+      });
+      return result.then(()=>log("Handled service" + service.uuid));
+    }
+    
+    function attachServicePromise(promise, service){
+      return promise.then(()=>createServicePromise(service));
+    }
+    
+    var reUseCounter = 0;
+
+    function initBt() {
+      log("initBt with blockInit: " + blockInit);
+      if (blockInit){
+        retry();
+        return;
+      }
+
+      blockInit = true;
+
+      if (reUseCounter > 10){
+        log("Reuse counter to high");
+        gatt=undefined;
+        reUseCounter = 0;
+      }
+      
+      var promise;
+      
+      if (!device){
+        promise = NRF.requestDevice({ filters: serviceFilters });
+        
+        if (settings.gracePeriodRequest){
+          log("Add " + settings.gracePeriodRequest + "ms grace period after request");
+          
+          promise = promise.then((d)=>{
+            log("Got device: ", d);
+            d.on('gattserverdisconnected', onDisconnect);
+            device = d;
+          });
+          
+          promise = promise.then(()=>{
+            log("Wait after request");
+            return waitingPromise(settings.gracePeriodRequest);
+          });
+        }
+        
+      } else {
+        promise = Promise.resolve();
+        log("Reuse device: ", device);
+      }
+      
+      promise = promise.then(()=>{
+        if (gatt){
+          log("Reuse GATT: ", gatt);
+        } else {
+          log("GATT is new: ", gatt);
+          characteristics = [];
+          var cachedName = getCache().name;
+          if (device.name != cachedName){
+            log("Device name changed from " + cachedName + " to " + device.name + ", clearing cache");
+            clearCache();
+          }
+          var newCache = getCache();
+          newCache.name = device.name;
+          writeCache(newCache);
+          gatt = device.gatt;
+        }
+        
+        return Promise.resolve(gatt);
+      });
+      
+      promise = promise.then((gatt)=>{
+        if (!gatt.connected){
+          var connectPromise = gatt.connect(connectSettings);
+          if (settings.gracePeriodConnect > 0){
+            log("Add " + settings.gracePeriodConnect + "ms grace period after connecting");
+            connectPromise = connectPromise.then(()=>{
+              log("Wait after connect");
+              return waitingPromise(settings.gracePeriodConnect);
+            });
+          }
+          return connectPromise;
+        } else {
+          return Promise.resolve();
+        }
+      });
+      
+      promise = promise.then(()=>{
+        if (!characteristics || characteristics.length == 0){
+          characteristics = characteristicsFromCache();
+        }
+      });
+
+      promise = promise.then(()=>{
+        var getCharacteristicsPromise = Promise.resolve();
+        if (characteristics.length == 0){
+          getCharacteristicsPromise = getCharacteristicsPromise.then(()=>{
+            log("Getting services");
+            return gatt.getPrimaryServices();
+          });
+
+          getCharacteristicsPromise = getCharacteristicsPromise().then((services)=>{
+            log("Got services:", services);
+            var result = Promise.resolve();
+            for (var service of services){
+              if (!(supportedServices.includes(service.uuid))) continue;
+              log("Supporting service: ", service.uuid);
+              result = attachServicePromise(result, service);
+            }
+            if (settings.gracePeriodService > 0) {
+              log("Add " + settings.gracePeriodService + "ms grace period after services");
+              result = result.then(()=>{
+                log("Wait after services");
+                return waitingPromise(settings.gracePeriodService)
+              });
+            }
+            return result;
+          });
+          
+        } else {
+          for (var characteristic of characteristics){
+            getCharacteristicsPromise = attachCharacteristicPromise(getCharacteristicsPromise, characteristic, true);
+          }
+        }
+        
+        return getCharacteristicsPromise;
+      });
+      
+      promise = promise.then(()=>{
+        log("Connection established, waiting for notifications");
+        reUseCounter = 0;
+        characteristicsToCache(characteristics);
+        clearRetryTimeout();
+      }).catch((e) => {
+        characteristics = [];
+        log("Error:", e);
+        onDisconnect(e);
+      });
+    }
+
+    Bangle.setBTHRMPower = function(isOn, app) {
+      // Do app power handling
+      if (!app) app="?";
+      if (Bangle._PWR===undefined) Bangle._PWR={};
+      if (Bangle._PWR.BTHRM===undefined) Bangle._PWR.BTHRM=[];
+      if (isOn && !Bangle._PWR.BTHRM.includes(app)) Bangle._PWR.BTHRM.push(app);
+      if (!isOn && Bangle._PWR.BTHRM.includes(app)) Bangle._PWR.BTHRM = Bangle._PWR.BTHRM.filter(a=>a!=app);
+      isOn = Bangle._PWR.BTHRM.length;
+      // so now we know if we're really on
+      if (isOn) {
+        if (!Bangle.isBTHRMConnected()) initBt();
+      } else { // not on
+        log("Power off for " + app);
+        if (gatt) {
+          if (gatt.connected){
+            log("Disconnect with gatt: ", gatt);
+            gatt.disconnect().then(()=>{
+              log("Successful disconnect", e);
+            }).catch(()=>{
+              log("Error during disconnect", e);
+            });
+          }
+        }
+      }
+    };
+    
+    var origSetHRMPower = Bangle.setHRMPower;
+
+    if (settings.startWithHrm){
+
+      Bangle.setHRMPower = function(isOn, app) {
+        log("setHRMPower for " + app + ": " + (isOn?"on":"off"));
+        if (settings.enabled){
+          Bangle.setBTHRMPower(isOn, app);
+        }
+        if ((settings.enabled && !settings.replace) || !settings.enabled){
+          origSetHRMPower(isOn, app);
+        }
+      };
+    }
+    
+    
+    var fallbackInterval;
+    
+    function switchInternalHrm(){
+      if (settings.allowFallback && !fallbackInterval){
+        log("Fallback to HRM enabled");
+        origSetHRMPower(1, "bthrm_fallback");
+        fallbackInterval = setInterval(()=>{
+          if (Bangle.isBTHRMConnected()){
+            origSetHRMPower(0, "bthrm_fallback");
+            clearInterval(fallbackInterval);
+            fallbackInterval = undefined;
+            log("Fallback to HRM disabled");
+          }
+        }, settings.fallbackTimeout);
+      }
+    }
+
+    if (settings.replace){
+      log("Replace HRM event");
+      if (Bangle._PWR && Bangle._PWR.HRM){
+        for (var i = 0; i < Bangle._PWR.HRM.length; i++){
+          var app = Bangle._PWR.HRM[i];
+          log("Moving app " + app);
+          origSetHRMPower(0, app);
+          Bangle.setBTHRMPower(1, app);
+          if (Bangle._PWR.HRM===undefined) break;
+        }
+      }
+      switchInternalHrm();
+    }
+    
+    E.on("kill", ()=>{
+      if (gatt && gatt.connected){
+        log("Got killed, trying to disconnect");
+        var promise = gatt.disconnect();
+        promise.then(()=>log("Disconnected on kill"));
+        promise.catch((e)=>log("Error during disconnnect on kill", e));
+      }
+    });
   }
 })();

apps/bthrm/bthrm.js

@@ -1,69 +1,95 @@
 var btm = g.getHeight()-1;
-var eventInt = null;
+var intervalInt;
-var eventBt = null;
+var intervalBt;
-var counterInt = 0;
-var counterBt = 0;
 
-
+function clear(y){
-function draw(y, event, type, counter) {
-  var px = g.getWidth()/2;
   g.reset();
-  g.setFontAlign(0,0);
   g.clearRect(0,y,g.getWidth(),y+75);
-  if (type == null || event == null || counter == 0){
-    return;
-  }
-  var str = event.bpm + "";
-  g.setFontVector(40).drawString(str,px,y+20);
-  str = "Confidence: " + event.confidence;
-  g.setFontVector(12).drawString(str,px,y+50);
-  str = "Event: " + type;
-  if (type == "HRM") str += " Source: " + (event.src ? event.src : "internal");
-  g.setFontVector(12).drawString(str,px,y+60);
 }
 
+function draw(y, type, event) {
+  clear(y);
+  var px = g.getWidth()/2;
+  var str = event.bpm + "";
+  g.reset();
+  g.setFontAlign(0,0);
+  g.setFontVector(40).drawString(str,px,y+20);
+  str = "Event: " + type;
+  if (type == "HRM") {
+    str += " Confidence: " + event.confidence;
+    g.setFontVector(12).drawString(str,px,y+40);
+    str = " Source: " + (event.src ? event.src : "internal");
+    g.setFontVector(12).drawString(str,px,y+50);
+  }
+  if (type == "BTHRM"){
+    if (event.battery) str += " Bat: " + (event.battery ? event.battery : "");
+    g.setFontVector(12).drawString(str,px,y+40);
+    str= "";
+    if (event.location) str += "Loc: " + event.location.toFixed(0) + "ms";
+    if (event.rr && event.rr.length > 0) str += " RR: " + event.rr.join(",");
+    g.setFontVector(12).drawString(str,px,y+50);
+    str= "";
+    if (event.contact) str += " Contact: " + event.contact;
+    if (event.energy) str += " kJoule: " + event.energy.toFixed(0);
+    g.setFontVector(12).drawString(str,px,y+60);
+  }
+  
+}
+
+var firstEventBt = true;
+var firstEventInt = true;
+
 function onBtHrm(e) {
-  //print("Event for BT " + JSON.stringify(e));
+  if (firstEventBt){
+    clear(24);
+    firstEventBt = false;
+  }
+  draw(100, "BTHRM", e);
   if (e.bpm == 0){
     Bangle.buzz(100,0.2);
   }
-  if (counterBt == 0){
+  if (intervalBt){
-    Bangle.buzz(200,0.5);
+    clearInterval(intervalBt);
   }
-  counterBt += 3;
+  intervalBt = setInterval(()=>{
-  eventBt = e;
+    clear(100);
+  }, 2000);
 }
 
 function onHrm(e) {
-  //print("Event for Int " + JSON.stringify(e));
+  if (firstEventInt){
-  counterInt += 3;
+    clear(24);
-  eventInt = e;
+    firstEventInt = false;
+  }
+  draw(24, "HRM", e);
+  if (intervalInt){
+    clearInterval(intervalInt);
+  }
+  intervalInt = setInterval(()=>{
+    clear(24);
+  }, 2000);
 }
 
+
+var settings = require('Storage').readJSON("bthrm.json", true) || {};
+
 Bangle.on('BTHRM', onBtHrm);
 Bangle.on('HRM', onHrm);
 
 Bangle.setHRMPower(1,'bthrm');
+if (!(settings.startWithHrm)){
+  Bangle.setBTHRMPower(1,'bthrm');
+}
 
 g.clear();
 Bangle.loadWidgets();
 Bangle.drawWidgets();
-
+if (Bangle.setBTHRMPower){
-g.reset().setFont("6x8",2).setFontAlign(0,0);
+  g.reset().setFont("6x8",2).setFontAlign(0,0);
-g.drawString("Please wait...",g.getWidth()/2,g.getHeight()/2 - 16);
+  g.drawString("Please wait...",g.getWidth()/2,g.getHeight()/2 - 24);
-
+} else {
-function drawInt(){
+  g.reset().setFont("6x8",2).setFontAlign(0,0);
-  counterInt--;
+  g.drawString("BTHRM disabled",g.getWidth()/2,g.getHeight()/2 + 32);
-  if (counterInt < 0) counterInt = 0;
-  if (counterInt > 3) counterInt = 3;
-  draw(24, eventInt, "HRM", counterInt);
-}
-function drawBt(){
-  counterBt--;
-  if (counterBt < 0) counterBt = 0;
-  if (counterBt > 3) counterBt = 3;
-  draw(100, eventBt, "BTHRM", counterBt);
 }
 
-var interval = setInterval(drawInt, 1000);
+E.on('kill', ()=>Bangle.setBTHRMPower(0,'bthrm'));
-var interval = setInterval(drawBt, 1000);

apps/bthrm/default.json

@@ -0,0 +1,13 @@
+{
+  "enabled": true,
+  "replace": true,
+  "debuglog": false,
+  "startWithHrm": true,
+  "allowFallback": true,
+  "warnDisconnect": false,
+  "fallbackTimeout": 10,
+  "gracePeriodNotification": 0,
+  "gracePeriodConnect": 0,
+  "gracePeriodService": 0,
+  "gracePeriodRequest": 0
+}

apps/bthrm/metadata.json

@@ -2,7 +2,7 @@
   "id": "bthrm",
   "name": "Bluetooth Heart Rate Monitor",
   "shortName": "BT HRM",
-  "version": "0.04",
+  "version": "0.05",
   "description": "Overrides Bangle.js's build in heart rate monitor with an external Bluetooth one.",
   "icon": "app.png",
   "type": "app",
@@ -14,6 +14,7 @@
     {"name":"bthrm.recorder.js","url":"recorder.js"},
     {"name":"bthrm.boot.js","url":"boot.js"},
     {"name":"bthrm.img","url":"app-icon.js","evaluate":true},
-    {"name":"bthrm.settings.js","url":"settings.js"}
+    {"name":"bthrm.settings.js","url":"settings.js"},
+    {"name":"bthrm.default.json","url":"default.json"}
   ]
 }

apps/bthrm/recorder.js

@@ -1,26 +1,38 @@
 (function(recorders) {
   recorders.bthrm = function() {
     var bpm = "";
+    var bat = "";
+    var energy = "";
+    var contact = "";
+    var rr= "";
     function onHRM(h) {
       bpm = h.bpm;
+      bat = h.bat;
+      energy = h.energy;
+      contact = h.contact;
+      if (h.rr) rr = h.rr.join(";");
     }
     return {
-      name : "BTHR",
+      name : "BT HR",
-      fields : ["BT Heartrate"],
+      fields : ["BT Heartrate", "BT Battery", "Energy expended", "Contact", "RR"],
       getValues : () => {
-        result = [bpm];
+        result = [bpm,bat,energy,contact,rr];
         bpm = "";
+        rr = "";
+        bat = "";
+        energy = "";
+        contact = "";
         return result;
       },
       start : () => {
         Bangle.on('BTHRM', onHRM);
-        Bangle.setBTHRMPower(1,"recorder");
+        if (Bangle.setBTRHMPower) Bangle.setBTHRMPower(1,"recorder");
       },
       stop : () => {
         Bangle.removeListener('BTHRM', onHRM);
-        Bangle.setBTHRMPower(0,"recorder");
+        if (Bangle.setBTRHMPower) Bangle.setBTHRMPower(0,"recorder");
       },
-      draw : (x,y) => g.setColor(Bangle.isBTHRMOn()?"#00f":"#88f").drawImage(atob("DAwBAAAAMMeef+f+f+P8H4DwBgAA"),x,y)
+      draw : (x,y) => g.setColor((Bangle.isBTHRMConnected && Bangle.isBTHRMConnected())?"#00f":"#88f").drawImage(atob("DAwBAAAAMMeef+f+f+P8H4DwBgAA"),x,y)
     };
   }
 })

apps/bthrm/settings.js

@@ -1,33 +1,247 @@
 (function(back) {
-  var FILE = "bthrm.json";
+  function writeSettings(key, value) {
-  
+    var s = require('Storage').readJSON(FILE, true) || {};
-  var settings = Object.assign({
+    s[key] = value;
-    enabled: true,
+    require('Storage').writeJSON(FILE, s);
-    replace: true,
+    readSettings();
-  }, require('Storage').readJSON(FILE, true) || {});
-
-  function writeSettings() {
-    require('Storage').writeJSON(FILE, settings);
   }
   
-  E.showMenu({
+  function readSettings(){
+    settings = Object.assign(
+      require('Storage').readJSON("bthrm.default.json", true) || {},
+      require('Storage').readJSON(FILE, true) || {}
+    );
+  }
+  
+  var FILE="bthrm.json";
+  var settings;
+  readSettings();
+
+  var mainmenu = {
     '': { 'title': 'Bluetooth HRM' },
     '< Back': back,
     'Use BT HRM': {
       value: !!settings.enabled,
       format: v => settings.enabled ? "On" : "Off",
       onchange: v => {
-        settings.enabled = v;
+        writeSettings("enabled",v);
-        writeSettings();
       }
     },
-    'Use HRM event': {
+    'Replace HRM': {
       value: !!settings.replace,
       format: v => settings.replace ? "On" : "Off",
       onchange: v => {
-        settings.replace = v;
+        writeSettings("replace",v);
-        writeSettings();
+      }
+    },
+    'Start with HRM': {
+      value: !!settings.startWithHrm,
+      format: v => settings.startWithHrm ? "On" : "Off",
+      onchange: v => {(function(back) {
+  function writeSettings(key, value) {
+    var s = require('Storage').readJSON(FILE, true) || {};
+    s[key] = value;
+    require('Storage').writeJSON(FILE, s);
+    readSettings();
+  }
+  
+  function readSettings(){
+    settings = Object.assign(
+      require('Storage').readJSON("bthrm.default.json", true) || {},
+      require('Storage').readJSON(FILE, true) || {}
+    );
+  }
+  
+  var FILE="bthrm.json";
+  var settings;
+  readSettings();
+
+  var mainmenu = {
+    '': { 'title': 'Bluetooth HRM' },
+    '< Back': back,
+    'Use BT HRM': {
+      value: !!settings.enabled,
+      format: v => settings.enabled ? "On" : "Off",
+      onchange: v => {
+        writeSettings("enabled",v);
+      }
+    },
+    'Replace HRM': {
+      value: !!settings.replace,
+      format: v => settings.replace ? "On" : "Off",
+      onchange: v => {
+        writeSettings("replace",v);
+      }
+    },
+    'Start w. HRM': {
+      value: !!settings.startWithHrm,
+      format: v => settings.startWithHrm ? "On" : "Off",
+      onchange: v => {
+        writeSettings("startWithHrm",v);
+      }
+    },
+    'HRM Fallback': {
+      value: !!settings.allowFallback,
+      format: v => settings.allowFallback ? "On" : "Off",
+      onchange: v => {
+        writeSettings("allowFallback",v);
+      }
+    },
+    'Fallback Timeout': {
+      value: settings.fallbackTimeout,
+      min: 5,
+      max: 60,
+      step: 5,
+      format: v=>v+"s",
+      onchange: v => {
+        writeSettings("fallbackTimout",v*1000);
+      }
+    },
+    'Conn. Alert': {
+      value: !!settings.warnDisconnect,
+      format: v => settings.warnDisconnect ? "On" : "Off",
+      onchange: v => {
+        writeSettings("warnDisconnect",v);
+      }
+    },
+    'Debug log': {
+      value: !!settings.debuglog,
+      format: v => settings.debuglog ? "On" : "Off",
+      onchange: v => {
+        writeSettings("debuglog",v);
+      }
+    },
+    'Grace periods >': function() { E.showMenu(submenu); }
+  };
+  
+  var submenu = {
+    '' : { title: "Grace periods"},
+    '< Back': function() { E.showMenu(mainmenu); },
+    'Request': {
+      value: settings.gracePeriodRequest,
+      min: 0,
+      max: 3000,
+      step: 100,
+      format: v=>v+"ms",
+      onchange: v => {
+        writeSettings("gracePeriodRequest",v);
+      }
+    },
+    'Connect': {
+      value: settings.gracePeriodConnect,
+      min: 0,
+      max: 3000,
+      step: 100,
+      format: v=>v+"ms",
+      onchange: v => {
+        writeSettings("gracePeriodConnect",v);
+      }
+    },
+    'Notification': {
+      value: settings.gracePeriodNotification,
+      min: 0,
+      max: 3000,
+      step: 100,
+      format: v=>v+"ms",
+      onchange: v => {
+        writeSettings("gracePeriodNotification",v);
+      }
+    },
+    'Service': {
+      value: settings.gracePeriodService,
+      min: 0,
+      max: 3000,
+      step: 100,
+      format: v=>v+"ms",
+      onchange: v => {
+        writeSettings("gracePeriodService",v);
       }
     }
-  });
+  };
+  
+  E.showMenu(mainmenu);
+})
+        writeSettings("startWithHrm",v);
+      }
+    },
+    'Fallback to HRM': {
+      value: !!settings.allowFallback,
+      format: v => settings.allowFallback ? "On" : "Off",
+      onchange: v => {
+        writeSettings("allowFallback",v);
+      }
+    },
+    'Fallback Timeout': {
+      value: settings.fallbackTimeout,
+      min: 5,
+      max: 60,
+      step: 5,
+      format: v=>v+"s",
+      onchange: v => {
+        writeSettings("fallbackTimout",v*1000);
+      }
+    },
+    'Conn. Alert': {
+      value: !!settings.warnDisconnect,
+      format: v => settings.warnDisconnect ? "On" : "Off",
+      onchange: v => {
+        writeSettings("warnDisconnect",v);
+      }
+    },
+    'Debug log': {
+      value: !!settings.debuglog,
+      format: v => settings.debuglog ? "On" : "Off",
+      onchange: v => {
+        writeSettings("debuglog",v);
+      }
+    },
+    'Grace periods': function() { E.showMenu(submenu); }
+  };
+  
+  var submenu = {
+    '' : { title: "Grace periods"},
+    '< Back': function() { E.showMenu(mainmenu); },
+    'Request': {
+      value: settings.gracePeriodRequest,
+      min: 0,
+      max: 3000,
+      step: 100,
+      format: v=>v+"ms",
+      onchange: v => {
+        writeSettings("gracePeriodRequest",v);
+      }
+    },
+    'Connect': {
+      value: settings.gracePeriodConnect,
+      min: 0,
+      max: 3000,
+      step: 100,
+      format: v=>v+"ms",
+      onchange: v => {
+        writeSettings("gracePeriodConnect",v);
+      }
+    },
+    'Notification': {
+      value: settings.gracePeriodNotification,
+      min: 0,
+      max: 3000,
+      step: 100,
+      format: v=>v+"ms",
+      onchange: v => {
+        writeSettings("gracePeriodNotification",v);
+      }
+    },
+    'Service': {
+      value: settings.gracePeriodService,
+      min: 0,
+      max: 3000,
+      step: 100,
+      format: v=>v+"ms",
+      onchange: v => {
+        writeSettings("gracePeriodService",v);
+      }
+    }
+  };
+  
+  E.showMenu(mainmenu);
 })

apps/bthrv/ChangeLog

@@ -0,0 +1,11 @@
+0.01: New App!
+0.02: Make overriding the HRM event optional
+      Emit BTHRM event for external sensor
+      Add recorder app plugin
+0.03: Prevent readings from internal sensor mixing into BT values
+      Mark events with src property
+      Show actual source of event in app
+0.04: Allow reading additional data if available: HRM battery and position
+      Better caching of scanned BT device properties
+      New setting for not starting the BTHRM together with HRM
+      Save some RAM by not definining functions if disabled in settings

apps/bthrv/README.md

@@ -0,0 +1,11 @@
+# Bluetooth Heart Rate Variance
+
+This app uses [BTHRM](https://banglejs.com/apps/#bthrm) and can calculate the HRV if the used bluetooth heart rate monitor delivers interval data.
+
+## Usage
+
+Just install and start the app. Select button resets the already measured values.
+
+## Creator
+
+[halemmerich](https://github.com/halemmerich)

apps/bthrv/app-icon.js

@@ -0,0 +1 @@
+require("heatshrink").decompress(atob("mEwwJC/ABUMAokcAq0eAok+Aok2AgcCm0EAoUHmw2DAoMOAgMDh9jEgPAg/98cfn/gg/58cbv/ggcB8cz8HADIPjmIECgHB8OAAoVB8AFDgPgIQcBCwYFMAH4ARA"))

apps/bthrv/app.js

@@ -0,0 +1,143 @@
+var btm = g.getHeight()-1;
+var ui = false;
+
+function clear(y){
+  g.reset();
+  g.clearRect(0,y,g.getWidth(),g.getHeight());
+}
+
+var startingTime;
+var currentSlot = 0;
+var hrvSlots = [10,20,30,60,120,300];
+var hrvValues = {};
+var rrRmsProgress;
+var saved = false;
+
+var rrNumberOfValues = 0;
+var rrSquared = 0;
+var rrLastValue
+var rrMax;
+var rrMin;
+
+function calcHrv(rr){
+  //Calculate HRV with RMSSD method: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5624990/
+  for (currentRr of rr){
+    if (!rrMax) rrMax = currentRr;
+    if (!rrMin) rrMin = currentRr;
+    rrMax = Math.max(rrMax, currentRr);
+    rrMin = Math.min(rrMin, currentRr);
+    //print("Calc for: " + currentRr);
+    rrNumberOfValues++;
+    if (!rrLastValue){
+      rrLastValue = currentRr;
+      continue;
+    }
+    rrSquared += (rrLastValue - currentRr)*(rrLastValue - currentRr);
+    
+    //print("rr²: " + rrSquared);
+    rrLastValue = currentRr;
+  }
+  var rms = Math.sqrt(rrSquared / rrNumberOfValues);
+  //print("rms: " + rms);
+  return rms;
+}
+
+
+function draw(y, hrv) {
+  clear(y);
+  var px = g.getWidth()/2;
+  var str = hrv.toFixed(1) + "ms";
+  g.reset();
+  g.setFontAlign(0,0);
+  g.setFontVector(40).drawString(str,px,y+20);
+
+  for (var i = 0; i < hrvSlots.length; i++){
+    str = hrvSlots[i] + "s: ";
+    if (hrvValues[hrvSlots[i]]) str += hrvValues[hrvSlots[i]].toFixed(1) + "ms";
+    g.setFontVector(16).drawString(str,px,y+44+(i*17));
+  }
+  
+  g.setRotation(3);
+  g.setFontVector(12).drawString("Reset",g.getHeight()/2, g.getWidth()-10);
+  g.setRotation(0);
+}
+
+function onBtHrm(e) {
+  if (e.rr && !startingTime) Bangle.buzz(500);
+  if (e.rr && !startingTime) startingTime=Date.now();
+  //print("Event:" + e.rr);
+  
+  var hrv = calcHrv(e.rr);
+  if (hrv){
+    if (currentSlot <= hrvSlots.length && (Date.now() - startingTime) > (hrvSlots[currentSlot] * 1000) && !hrvValues[hrvSlots[currentSlot]]){
+      hrvValues[hrvSlots[currentSlot]] = hrv;
+      currentSlot++;
+    }
+  }
+  if (!saved && currentSlot == hrvSlots.length){
+    var file = require('Storage').open("bthrv.csv", "a");
+    var data = new Date(startingTime).toISOString();
+    for (var c of hrvSlots){
+      data+=","+hrvValues[c];
+    }
+    data+="," + rrMax + "," + rrMin + ","+rrNumberOfValues;
+    data+="\n";
+    file.write(data);
+    saved = true;
+    Bangle.buzz(500);
+  }
+  if (hrv){
+    if (!ui){      
+      Bangle.setUI("leftright", ()=>{
+        resetHrv();
+        clear(30);
+      });
+      ui = true;
+    }
+    draw(30, hrv);
+  }
+}
+
+function resetHrv(){
+  hrvValues={};
+  startingTime=undefined;
+  currentSlot=0;
+  saved=false;
+  rrNumberOfValues = 0;
+  rrSquared = 0;
+  rrLastValue = undefined;
+  rrMax = undefined;
+  rrMin = undefined;
+}
+
+
+var settings = require('Storage').readJSON("bthrm.json", true) || {};
+
+g.clear();
+Bangle.loadWidgets();
+Bangle.drawWidgets();
+
+
+if (Bangle.setBTHRMPower){
+  Bangle.on('BTHRM', onBtHrm);
+  Bangle.setBTHRMPower(1,'bthrv');
+
+  if (require('Storage').list(/bthrv.csv/).length == 0){
+    var file = require('Storage').open("bthrv.csv", "a");
+    var data = "Time";
+    for (var c of hrvSlots){
+      data+="," + c + "s";
+    }
+    data+=",RR_max,RR_min,Measurements";
+    data+="\n";
+    file.write(data);
+  }
+
+  g.reset().setFont("6x8",2).setFontAlign(0,0);
+  g.drawString("Please wait...",g.getWidth()/2,g.getHeight()/2 - 16);
+} else {
+  g.reset().setFont("6x8",2).setFontAlign(0,0);
+  g.drawString("Missing BT HRM",g.getWidth()/2,g.getHeight()/2 - 16);
+}
+
+E.on('kill', ()=>Bangle.setBTHRMPower(0,'bthrv'));

apps/bthrv/metadata.json

@@ -0,0 +1,17 @@
+{
+  "id": "bthrv",
+  "name": "Bluetooth Heart Rate variance calculator",
+  "shortName": "BT HRV",
+  "version": "0.01",
+  "description": "Calculates HRV from a a BT HRM with interval data",
+  "icon": "app.png",
+  "type": "app",
+  "tags": "health,bluetooth",
+  "supports": ["BANGLEJS","BANGLEJS2"],
+  "readme": "README.md",
+  "storage": [
+    {"name":"bthrv.app.js","url":"app.js"},
+    {"name":"bthrv.recorder.js","url":"recorder.js"},
+    {"name":"bthrv.img","url":"app-icon.js","evaluate":true}
+  ]
+}

apps/bthrv/recorder.js

@@ -0,0 +1,51 @@
+(function(recorders) {
+  recorders.bthrv = function() {
+    var lastGetValue = 0;
+    var lastUpdate = 0;
+    var rrHistory = [];
+    var hrv = "";
+    function onHRM(h) {
+      if(!h.rr) return;
+      if (lastUpdate + 3000 < Date.now()){
+        rrHistory = [];
+      }
+      rrHistory = rrHistory.concat(h.rr);
+      lastUpdate=Date.now();
+    }
+    return {
+      name : "BT HRV",
+      fields : ["BT HRV"],
+      getValues : () => {
+        if (lastGetValue + 10000 < Date.now()){
+          lastGetValue = Date.now();
+          
+          if (rrHistory.length > 0){
+            if (rrHistory.length > 1){
+              var squaredSum = 0;
+              var last = rrHistory[0]
+              for (var i = 1; i < rrHistory.length; i++){
+                squaredSum += (last - rrHistory[i])*(last - rrHistory[i]);
+                last = rrHistory[i];
+              }
+              hrv = Math.sqrt(squaredSum/rrHistory.length);
+            }
+          }
+        }
+        result = [hrv];
+        hrv = "";
+        rrHistory = [];
+        return result;
+      },
+      start : () => {
+        Bangle.on('BTHRM', onHRM);
+        if (Bangle.setBTRHMPower) Bangle.setBTHRMPower(1,"recorder");
+      },
+      stop : () => {
+        Bangle.removeListener('BTHRM', onHRM);
+        if (Bangle.setBTRHMPower) Bangle.setBTHRMPower(0,"recorder");
+      },
+      draw : (x,y) => g.setColor((rrHistory.length > 0)?"#00f":"#008").drawImage(atob("DAwBAAAACECECECEDGClacEEAAAA"),x,y)
+    };
+  }
+})
+

apps/recorder/widget.js

@@ -12,6 +12,11 @@
     return settings;
   }
   
+  function updateSettings(settings) {
+    require("Storage").writeJSON("recorder.json", settings);
+    if (WIDGETS["recorder"]) WIDGETS["recorder"].reload();
+  }
+
   function getRecorders() {
     var recorders = {
       gps:function() {
@@ -52,17 +57,18 @@
         };
       },
       hrm:function() {
-        var bpm = "", bpmConfidence = "";
+        var bpm = "", bpmConfidence = "", src="";
         function onHRM(h) {
           bpmConfidence = h.confidence;
           bpm = h.bpm;
+          srv = h.src;
         }
         return {
           name : "HR",
-          fields : ["Heartrate", "Confidence"],
+          fields : ["Heartrate", "Confidence", "Source"],
           getValues : () => {
-            var r = [bpm,bpmConfidence];
+            var r = [bpm,bpmConfidence,src];
-            bpm = ""; bpmConfidence = "";
+            bpm = ""; bpmConfidence = ""; src="";
             return r;
           },
           start : () => {
@@ -227,15 +233,32 @@
     Bangle.drawWidgets(); // relayout all widgets
   },setRecording:function(isOn) {
     var settings = loadSettings();
-    if (isOn && !settings.recording && require("Storage").list(settings.file).length)
+    if (isOn && !settings.recording && require("Storage").list(settings.file).length){
-      return E.showPrompt("Overwrite\nLog " + settings.file.match(/\d+/)[0] + "?",{title:"Recorder",buttons:{Yes:"yes",No:"no"}}).then(selection=>{
+      var logfiles=require("Storage").list(/recorder.log.*/);
+      var maxNumber=0;
+      for (var c of logfiles){
+          maxNumber = Math.max(maxNumber, c.match(/\d+/)[0]);
+      }
+      var newFileName;
+      if (maxNumber < 99){
+        newFileName="recorder.log" + (maxNumber + 1) + ".csv";
+        updateSettings(settings);
+      }
+      var buttons={Yes:"yes",No:"no"};
+      if (newFileName) buttons["New"] = "new";
+      var prompt = E.showPrompt("Overwrite\nLog " + settings.file.match(/\d+/)[0] + "?",{title:"Recorder",buttons:buttons}).then(selection=>{
         if (selection=="no") return false; // just cancel
         if (selection=="yes") require("Storage").open(settings.file,"r").erase();
-        // TODO: Add 'new file' option
+        if (selection=="new"){
+          settings.file = newFileName;
+          updateSettings(settings);
+        }
         return WIDGETS["recorder"].setRecording(1);
       });
+      return prompt;
+    }
     settings.recording = isOn;
-    require("Storage").write("recorder.json", settings);
+    updateSettings(settings);
     WIDGETS["recorder"].reload();
     return Promise.resolve(settings.recording);
   }/*,plotTrack:function(m) { // m=instance of openstmap module