Implement solar power saving features and deep sleep

Co-authored-by: dorkmo <[email protected]>

Author: Copilot

TankAlarm-112025-Client-BluesOpta/TankAlarm-112025-Client-BluesOpta.ino

@@ -358,6 +358,8 @@ struct ClientConfig {
   // Optional clear button configuration
   int8_t clearButtonPin;        // Pin for physical clear button (-1 = disabled)
   bool clearButtonActiveHigh;   // true = button active when HIGH, false = active when LOW (with pullup)
+  // Power saving configuration
+  bool solarPowered;            // true = solar powered (use power saving features), false = grid-tied
 };
 
 struct TankRuntime {
@@ -658,7 +660,12 @@ void loop() {
   }
 
   // Sleep to reduce power consumption between loop iterations
-  delay(100);
+  // Use Mbed OS deep sleep for better power efficiency (reduces idle current significantly)
+  #if defined(ARDUINO_OPTA) || defined(ARDUINO_ARCH_MBED)
+    ThisThread::sleep_for(100ms);  // Deep sleep for 100ms - CPU enters low-power state
+  #else
+    delay(100);  // Fallback for non-Mbed platforms
+  #endif
 }
 
 static void initializeStorage() {
@@ -767,6 +774,9 @@ static void createDefaultConfig(ClientConfig &cfg) {
   // Clear button defaults (disabled)
   cfg.clearButtonPin = -1;           // -1 = disabled
   cfg.clearButtonActiveHigh = false; // Active LOW with pullup (button connects to GND)
+  
+  // Power saving defaults (grid-tied, no special power saving)
+  cfg.solarPowered = false;          // false = grid-tied (default)
 }
 
 static bool loadConfigFromFlash(ClientConfig &cfg) {
@@ -842,6 +852,9 @@ static bool loadConfigFromFlash(ClientConfig &cfg) {
   // Load clear button configuration
   cfg.clearButtonPin = doc["clearButtonPin"].is<int>() ? doc["clearButtonPin"].as<int8_t>() : -1;
   cfg.clearButtonActiveHigh = doc["clearButtonActiveHigh"].is<bool>() ? doc["clearButtonActiveHigh"].as<bool>() : false;
+  
+  // Load power saving configuration
+  cfg.solarPowered = doc["solarPowered"].is<bool>() ? doc["solarPowered"].as<bool>() : false;
 
   cfg.tankCount = doc["tanks"].is<JsonArray>() ? min<uint8_t>(doc["tanks"].size(), MAX_TANKS) : 0;
 
@@ -978,6 +991,9 @@ static bool saveConfigToFlash(const ClientConfig &cfg) {
   // Save clear button configuration
   doc["clearButtonPin"] = cfg.clearButtonPin;
   doc["clearButtonActiveHigh"] = cfg.clearButtonActiveHigh;
+  
+  // Save power saving configuration
+  doc["solarPowered"] = cfg.solarPowered;
 
   JsonArray tanks = doc.createNestedArray("tanks");
   for (uint8_t i = 0; i < cfg.tankCount; ++i) {
@@ -1176,9 +1192,19 @@ static void initializeNotecard() {
   req = notecard.newRequest("hub.set");
   if (req) {
     JAddStringToObject(req, "product", PRODUCT_UID);
-    JAddStringToObject(req, "mode", "periodic");
-    JAddIntToObject(req, "outbound", 360);  // Sync every 6 hours
-    JAddIntToObject(req, "inbound", 10);     // Check for inbound every 10 minutes
+    
+    // Power saving configuration based on power source
+    if (gConfig.solarPowered) {
+      // Solar powered: Use periodic mode with extended inbound check to save power
+      JAddStringToObject(req, "mode", "periodic");
+      JAddIntToObject(req, "outbound", 360);  // Sync every 6 hours
+      JAddIntToObject(req, "inbound", 60);    // Check for inbound every 60 minutes (power saving)
+    } else {
+      // Grid-tied: Use continuous mode for faster response times
+      JAddStringToObject(req, "mode", "continuous");
+      // In continuous mode, outbound/inbound are not used - always connected
+    }
+    
     // No route needed - using fleet-based targeting
     notecard.sendRequest(req);
   }
@@ -1435,6 +1461,15 @@ static void applyConfigUpdate(const JsonDocument &doc) {
   if (doc.containsKey("clearButtonActiveHigh")) {
     gConfig.clearButtonActiveHigh = doc["clearButtonActiveHigh"].as<bool>();
   }
+  
+  // Handle power saving configuration
+  if (doc.containsKey("solarPowered")) {
+    bool newSolarPowered = doc["solarPowered"].as<bool>();
+    if (newSolarPowered != gConfig.solarPowered) {
+      gConfig.solarPowered = newSolarPowered;
+      hardwareChanged = true;  // Need to reconfigure Notecard hub settings
+    }
+  }
 
   if (doc.containsKey("tanks")) {
     hardwareChanged = true;  // Tank configuration affects hardware

TankAlarm-112025-Server-BluesOpta/TankAlarm-112025-Server-BluesOpta.ino

@@ -748,6 +748,14 @@ static const char CONFIG_GENERATOR_HTML[] PROGMEM = R"HTML(
           <label class="field"><span>Daily Report Email Recipient</span><input id="dailyEmail" type="email"></label>
         </div>
         
+        <h3>Power Configuration</h3>
+        <div class="form-grid">
+          <label class="field" style="display: flex; align-items: center; gap: 8px; grid-column: 1 / -1;">
+            <input type="checkbox" id="solarPowered" style="width: auto;">
+            <span>Solar Powered<span class="tooltip-icon" tabindex="0" data-tooltip="Enable power saving features for solar-powered installations. Uses periodic mode with 60-minute inbound check intervals and deep sleep routines. When disabled (grid-tied), uses continuous mode for faster response times.">?</span></span>
+          </label>
+        </div>
+        
         <h3>Sensors</h3>
         <div id="sensorsContainer"></div>
         
@@ -1394,6 +1402,7 @@ static const char CONFIG_GENERATOR_HTML[] PROGMEM = R"HTML(
         reportHour: reportHour,
         reportMinute: reportMinute,
         dailyEmail: document.getElementById('dailyEmail').value.trim(),
+        solarPowered: document.getElementById('solarPowered').checked,
         tanks: []
       };