Add saving BPM on timed reboot

src/bubbles.cpp

@@ -171,3 +171,7 @@ float Bubbles::getAvgBpm() {
     }
     return(avg);
 }
+
+void Bubbles::setLast(double last) {
+    bubAvg.push(last);
+}

src/bubbles.h

@@ -65,6 +65,7 @@ class Bubbles {
         float getAvgVessel();
         float getAvgBpm();
         bool doBub;
+        void setLast(double);                // Push last reading on reboot
 };
 
 #endif // _BUBBLES_H

src/main.cpp

@@ -56,7 +56,8 @@ void setup() {
     NtpHandler *ntpTime = NtpHandler::getInstance();
     ntpTime->start();
 
-    execspiffs(); // Check for pending SPIFFS update
+    execspiffs();   // Check for pending SPIFFS update
+    loadBpm() ;     // Get last Bpm reading if it was a controlled reboot
 
     Log.notice(F("Started %s version %s (%s) [%s]." CR), API_KEY, version(), branch(), build());
 }
@@ -94,10 +95,7 @@ void loop() {
     // Reboot timer - I wish controllers could be counted on to be more
     // stable but at least it only takes a few seconds.
     Ticker rebootTimer;
-    rebootTimer.attach(REBOOTTIMER, [](){
-        Log.notice(F("Reboot timer - rebooting system."));
-        ESP.restart();
-    });
+    rebootTimer.attach(REBOOTTIMER, reboot);
 
     while (true) {
 

src/tools.cpp

@@ -46,3 +46,64 @@ void _delay(unsigned long ulDelay) {
         yield();
     }
 }
+
+void reboot() {
+    Log.notice(F("Reboot timer - rebooting system." CR));
+    saveBpm();
+    ESP.restart();
+}
+
+void loadBpm() {
+    Bubbles *bubble = Bubbles::getInstance();
+    const size_t capacity = JSON_OBJECT_SIZE(1) + 10;
+    DynamicJsonDocument doc(capacity);
+    const char * bpmFileName = "lastBpm.json";
+
+    // Mount SPIFFS
+    if (!SPIFFS.begin()) {
+        Log.error(F("CONFIG: Failed to mount SPIFFS." CR));
+        return;
+    }
+
+    // Open file for reading
+    File file = SPIFFS.open(bpmFileName, "r");
+    if (!SPIFFS.exists(bpmFileName) || !file) {
+        Log.notice(F("No lastBpm available." CR));
+    } else {
+        // Parse the JSON object in the file
+        DeserializationError err = deserializeJson(doc, file);
+        if (err) {
+            Log.error(F("Failed to deserialize lastBpm." CR));
+            Log.error(err.c_str());         
+        } else {
+            bubble->setLast(doc["lastBpm"]);
+            Log.notice(F("Loaded lastBpm." CR));
+        }
+        // Delete file
+        SPIFFS.remove(bpmFileName);
+    }
+}
+
+void saveBpm() {
+    Bubbles *bubble = Bubbles::getInstance();
+    const size_t capacity = JSON_OBJECT_SIZE(1) + 10;
+    DynamicJsonDocument doc(capacity);
+    const char * bpmFileName = "lastBpm.json";
+
+    doc["lastBpm"] = bubble->getAvgBpm();
+
+    // Open file for writing
+    File file = SPIFFS.open(bpmFileName, "w");
+    if (!file) {
+        Log.error(F("Failed to open lastBpm file." CR));
+    } else {
+        // Serialize the JSON object to the file
+        bool success = serializeJson(doc, file);
+        // This may fail if the JSON is invalid
+        if (!success) {
+            Log.error(F("Failed to serialize lastBpm." CR));
+        } else {
+            Log.verbose(F("Saved lastBpm." CR), bpmFileName);
+        }
+    }
+}

src/tools.h

@@ -29,5 +29,8 @@ SOFTWARE. */
 #define EEPROM_ADDRESS 0x00
 
 void _delay(unsigned long);
+void reboot();
+void loadBpm();
+void saveBpm();
 
 #endif