feature: adding a default wifi option

src/WifiCredentialStore.cpp

@@ -3,6 +3,11 @@
 #include <HardwareSerial.h>
 #include <SDCardManager.h>
 #include <Serialization.h>
+#include <WiFi.h>
+#include <freertos/task.h>
+
+#include "activities/ActivityWithSubactivity.h"
+#include "activities/network/WifiSelectionActivity.h"
 
 // Initialize the static instance
 WifiCredentialStore WifiCredentialStore::instance;
@@ -53,6 +58,10 @@ bool WifiCredentialStore::saveToFile() const {
     serialization::writeString(file, obfuscatedPwd);
   }
 
+  // Write default SSID
+  serialization::writeString(file, defaultSSID);
+  Serial.printf("[%lu] [WCS] Saving default SSID: %s\n", millis(), defaultSSID.c_str());
+
   file.close();
   Serial.printf("[%lu] [WCS] Saved %zu WiFi credentials to file\n", millis(), credentials.size());
   return true;
@@ -95,6 +104,27 @@ bool WifiCredentialStore::loadFromFile() {
     credentials.push_back(cred);
   }
 
+  // Try to read default SSID if it exists
+  defaultSSID.clear();
+  if (file.available() >= 4) {
+    const uint32_t posBefore = file.position();
+    uint32_t len = 0;
+    serialization::readPod(file, len);
+
+    if (file.available() >= len && len <= 64) {
+      defaultSSID.resize(len);
+      const size_t bytesRead = file.read(reinterpret_cast<uint8_t*>(&defaultSSID[0]), len);
+      if (bytesRead == len) {
+        Serial.printf("[%lu] [WCS] Loaded default SSID: %s\n", millis(), defaultSSID.c_str());
+      } else {
+        file.seek(posBefore);
+        defaultSSID.clear();
+      }
+    } else {
+      file.seek(posBefore);
+    }
+  }
+
   file.close();
   Serial.printf("[%lu] [WCS] Loaded %zu WiFi credentials from file\n", millis(), credentials.size());
   return true;
@@ -127,6 +157,9 @@ bool WifiCredentialStore::removeCredential(const std::string& ssid) {
                             [&ssid](const WifiCredential& cred) { return cred.ssid == ssid; });
   if (cred != credentials.end()) {
     credentials.erase(cred);
+    if (defaultSSID == ssid) {
+      defaultSSID.clear();
+    }
     Serial.printf("[%lu] [WCS] Removed credentials for: %s\n", millis(), ssid.c_str());
     return saveToFile();
   }
@@ -148,6 +181,107 @@ bool WifiCredentialStore::hasSavedCredential(const std::string& ssid) const { re
 
 void WifiCredentialStore::clearAll() {
   credentials.clear();
+  defaultSSID.clear();
   saveToFile();
   Serial.printf("[%lu] [WCS] Cleared all WiFi credentials\n", millis());
 }
+
+void WifiCredentialStore::setDefaultSSID(const std::string& ssid) {
+  defaultSSID = ssid;
+  saveToFile();
+  Serial.printf("[%lu] [WCS] Set default SSID: %s\n", millis(), ssid.c_str());
+}
+
+bool WifiCredentialStore::connectToDefaultWifi(int timeoutMs) const {
+  if (defaultSSID.empty()) {
+    Serial.printf("[%lu] [WCS] No default SSID set\n", millis());
+    return false;
+  }
+
+  const auto* cred = findCredential(defaultSSID);
+  if (!cred) {
+    return false;
+  }
+
+  // Quick check: scan to see if the SSID is available before attempting connection
+  WiFi.mode(WIFI_STA);
+  WiFi.disconnect(false);
+  delay(100);
+  
+  Serial.printf("[%lu] [WCS] Scanning for SSID: %s\n", millis(), defaultSSID.c_str());
+  WiFi.scanNetworks(false);
+  
+  const unsigned long scanStart = millis();
+  int16_t scanResult = WiFi.scanComplete();
+  while (scanResult == WIFI_SCAN_RUNNING && millis() - scanStart < 3000) {
+    delay(100);
+    scanResult = WiFi.scanComplete();
+  }
+  
+  if (scanResult > 0) {
+    bool ssidFound = false;
+    for (int i = 0; i < scanResult; i++) {
+      std::string scannedSSID = WiFi.SSID(i).c_str();
+      if (scannedSSID == defaultSSID) {
+        ssidFound = true;
+        break;
+      }
+    }
+    
+    WiFi.scanDelete();
+    
+    if (!ssidFound) {
+      Serial.printf("[%lu] [WCS] SSID not found in scan results, skipping connection attempt\n", millis());
+      return false;
+    }
+  } else {
+    WiFi.scanDelete();
+    return false;
+  }
+
+  WiFi.begin(defaultSSID.c_str(), cred->password.c_str());
+
+  Serial.printf("[%lu] [WCS] Connecting to default WiFi: %s\n", millis(), defaultSSID.c_str());
+  const unsigned long startTime = millis();
+  while (WiFi.status() != WL_CONNECTED && millis() - startTime < static_cast<unsigned long>(timeoutMs)) {
+    vTaskDelay(100 / portTICK_PERIOD_MS);
+  }
+
+  if (WiFi.status() == WL_CONNECTED) {
+    Serial.printf("[%lu] [WCS] Connected to default WiFi: %s (IP: %s)\n", millis(), defaultSSID.c_str(),
+                  WiFi.localIP().toString().c_str());
+    return true;
+  } else {
+    Serial.printf("[%lu] [WCS] Failed to connect to default WiFi: %s\n", millis(), defaultSSID.c_str());
+    return false;
+  }
+}
+
+void WifiCredentialStore::ensureWifiConnected(ActivityWithSubactivity& activity, GfxRenderer& renderer,
+                                              MappedInputManager& mappedInput, const std::function<void()>& onSuccess,
+                                              const std::function<void()>& onCancel, int timeoutMs) {
+
+  if (WiFi.status() == WL_CONNECTED) {
+    onSuccess();
+    return;
+  }
+
+  // Try to connect using default WiFi
+  WifiCredentialStore::getInstance().loadFromFile();
+  if (WifiCredentialStore::getInstance().connectToDefaultWifi(timeoutMs)) {
+    Serial.printf("[%lu] [WCS] Auto-connected to WiFi\n", millis());
+    onSuccess();
+    return;
+  }
+
+  // Auto-connect failed - show WiFi selection list
+  Serial.printf("[%lu] [WCS] Auto-connect failed, showing WiFi selection\n", millis());
+  activity.enterNewActivity(new WifiSelectionActivity(renderer, mappedInput, [&activity, onSuccess, onCancel](bool connected) {
+    activity.exitActivity();
+    if (connected) {
+      onSuccess();
+    } else {
+      onCancel();
+    }
+  }));
+}

src/WifiCredentialStore.h

@@ -1,7 +1,12 @@
 #pragma once
+#include <functional>
 #include <string>
 #include <vector>
 
+class ActivityWithSubactivity;
+class GfxRenderer;
+class MappedInputManager;
+
 struct WifiCredential {
   std::string ssid;
   std::string password;  // Stored obfuscated in file
@@ -16,6 +21,7 @@ class WifiCredentialStore {
  private:
   static WifiCredentialStore instance;
   std::vector<WifiCredential> credentials;
+  std::string defaultSSID;
 
   static constexpr size_t MAX_NETWORKS = 8;
 
@@ -50,6 +56,16 @@ class WifiCredentialStore {
 
   // Clear all credentials
   void clearAll();
+
+  // Default network management
+  void setDefaultSSID(const std::string& ssid);
+  const std::string& getDefaultSSID() const { return defaultSSID; }
+  bool connectToDefaultWifi(int timeoutMs = 5000) const;
+
+  // Helper function to try connecting to default WiFi, or show WiFi selection if it fails
+  static void ensureWifiConnected(ActivityWithSubactivity& activity, GfxRenderer& renderer,
+                                  MappedInputManager& mappedInput, const std::function<void()>& onSuccess,
+                                  const std::function<void()>& onCancel, int timeoutMs = 10000);
 };
 
 // Helper macro to access credentials store

src/activities/ActivityWithSubactivity.h

@@ -6,10 +6,10 @@
 class ActivityWithSubactivity : public Activity {
  protected:
   std::unique_ptr<Activity> subActivity = nullptr;
-  void exitActivity();
-  void enterNewActivity(Activity* activity);
 
  public:
+  void exitActivity();
+  void enterNewActivity(Activity* activity);
   explicit ActivityWithSubactivity(std::string name, GfxRenderer& renderer, MappedInputManager& mappedInput)
       : Activity(std::move(name), renderer, mappedInput) {}
   void loop() override;

src/activities/browser/OpdsBookBrowserActivity.cpp

@@ -8,6 +8,7 @@
 #include "MappedInputManager.h"
 #include "ScreenComponents.h"
 #include "WifiCredentialStore.h"
+#include "activities/network/WifiSelectionActivity.h"
 #include "fontIds.h"
 #include "network/HttpDownloader.h"
 #include "util/StringUtils.h"
@@ -66,6 +67,11 @@ void OpdsBookBrowserActivity::onExit() {
 }
 
 void OpdsBookBrowserActivity::loop() {
+  if (subActivity) {
+    subActivity->loop();
+    return;
+  }
+
   // Handle error state - Confirm retries, Back goes back or home
   if (state == BrowserState::ERROR) {
     if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
@@ -82,6 +88,9 @@ void OpdsBookBrowserActivity::loop() {
   // Handle WiFi check state - only Back works
   if (state == BrowserState::CHECK_WIFI) {
     if (mappedInput.wasReleased(MappedInputManager::Button::Back)) {
+      if (subActivity) {
+        exitActivity();
+      }
       onGoHome();
     }
     return;
@@ -139,6 +148,12 @@ void OpdsBookBrowserActivity::loop() {
 
 void OpdsBookBrowserActivity::displayTaskLoop() {
   while (true) {
+    // If a subactivity is active, yield CPU time but don't render
+    if (subActivity) {
+      vTaskDelay(10 / portTICK_PERIOD_MS);
+      continue;
+    }
+
     if (updateRequired) {
       updateRequired = false;
       xSemaphoreTake(renderingMutex, portMAX_DELAY);
@@ -350,49 +365,24 @@ void OpdsBookBrowserActivity::downloadBook(const OpdsEntry& book) {
 }
 
 void OpdsBookBrowserActivity::checkAndConnectWifi() {
-  // Already connected?
-  if (WiFi.status() == WL_CONNECTED) {
-    state = BrowserState::LOADING;
-    statusMessage = "Loading...";
-    updateRequired = true;
-    fetchFeed(currentPath);
-    return;
-  }
-
-  // Try to connect using saved credentials
-  statusMessage = "Connecting to WiFi...";
-  updateRequired = true;
-
   WIFI_STORE.loadFromFile();
-  const auto& credentials = WIFI_STORE.getCredentials();
+  const bool hasDefaultSSID = !WIFI_STORE.getDefaultSSID().empty();
-  if (credentials.empty()) {
+  const bool alreadyConnected = (WiFi.status() == WL_CONNECTED);
-    state = BrowserState::ERROR;
+  
-    errorMessage = "No WiFi credentials saved";
+  if (hasDefaultSSID && !alreadyConnected) {
+    statusMessage = "Connecting to WiFi...";
     updateRequired = true;
-    return;
   }
 
-  // Use the first saved credential
+  WIFI_STORE.ensureWifiConnected(
-  const auto& cred = credentials[0];
+      *this, renderer, mappedInput,
-  WiFi.mode(WIFI_STA);
+      [this]() {
-  WiFi.begin(cred.ssid.c_str(), cred.password.c_str());
-
-  // Wait for connection with timeout
-  constexpr int WIFI_TIMEOUT_MS = 10000;
-  const unsigned long startTime = millis();
-  while (WiFi.status() != WL_CONNECTED && millis() - startTime < WIFI_TIMEOUT_MS) {
-    vTaskDelay(100 / portTICK_PERIOD_MS);
-  }
-
-  if (WiFi.status() == WL_CONNECTED) {
-    Serial.printf("[%lu] [OPDS] WiFi connected: %s\n", millis(), WiFi.localIP().toString().c_str());
     state = BrowserState::LOADING;
     statusMessage = "Loading...";
     updateRequired = true;
     fetchFeed(currentPath);
-  } else {
+      },
-    state = BrowserState::ERROR;
+      [this]() {
-    errorMessage = "WiFi connection failed";
+        onGoHome();
-    updateRequired = true;
+      });
-  }
 }

src/activities/browser/OpdsBookBrowserActivity.h

@@ -8,13 +8,13 @@
 #include <string>
 #include <vector>
 
-#include "../Activity.h"
+#include "../ActivityWithSubactivity.h"
 
 /**
  * Activity for browsing and downloading books from an OPDS server.
  * Supports navigation through catalog hierarchy and downloading EPUBs.
  */
-class OpdsBookBrowserActivity final : public Activity {
+class OpdsBookBrowserActivity final : public ActivityWithSubactivity {
  public:
   enum class BrowserState {
     CHECK_WIFI,   // Checking WiFi connection
@@ -26,7 +26,7 @@ class OpdsBookBrowserActivity final : public Activity {
 
   explicit OpdsBookBrowserActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
                                    const std::function<void()>& onGoHome)
-      : Activity("OpdsBookBrowser", renderer, mappedInput), onGoHome(onGoHome) {}
+      : ActivityWithSubactivity("OpdsBookBrowser", renderer, mappedInput), onGoHome(onGoHome) {}
 
   void onEnter() override;
   void onExit() override;

src/activities/network/CrossPointWebServerActivity.cpp

@@ -10,7 +10,7 @@
 
 #include "MappedInputManager.h"
 #include "NetworkModeSelectionActivity.h"
-#include "WifiSelectionActivity.h"
+#include "WifiCredentialStore.h"
 #include "fontIds.h"
 
 namespace {
@@ -135,14 +135,24 @@ void CrossPointWebServerActivity::onNetworkModeSelected(const NetworkMode mode)
   exitActivity();
 
   if (mode == NetworkMode::JOIN_NETWORK) {
-    // STA mode - launch WiFi selection
+    // STA mode - use ensureWifiConnected helper
-    Serial.printf("[%lu] [WEBACT] Turning on WiFi (STA mode)...\n", millis());
+    Serial.printf("[%lu] [WEBACT] Checking WiFi connection...\n", millis());
     WiFi.mode(WIFI_STA);
 
     state = WebServerActivityState::WIFI_SELECTION;
-    Serial.printf("[%lu] [WEBACT] Launching WifiSelectionActivity...\n", millis());
+    WIFI_STORE.ensureWifiConnected(
-    enterNewActivity(new WifiSelectionActivity(renderer, mappedInput,
+        *this, renderer, mappedInput,
-                                               [this](const bool connected) { onWifiSelectionComplete(connected); }));
+        [this]() {
+          // WiFi connected - start web server
+          connectedIP = WiFi.localIP().toString().c_str();
+          connectedSSID = WiFi.SSID().c_str();
+          isApMode = false;
+          onWifiSelectionComplete(true);
+        },
+        [this]() {
+          // WiFi connection cancelled - go back to mode selection
+          onWifiSelectionComplete(false);
+        });
   } else {
     // AP mode - start access point
     state = WebServerActivityState::AP_STARTING;
@@ -152,15 +162,15 @@ void CrossPointWebServerActivity::onNetworkModeSelected(const NetworkMode mode)
 }
 
 void CrossPointWebServerActivity::onWifiSelectionComplete(const bool connected) {
-  Serial.printf("[%lu] [WEBACT] WifiSelectionActivity completed, connected=%d\n", millis(), connected);
+  Serial.printf("[%lu] [WEBACT] WiFi connection completed, connected=%d\n", millis(), connected);
 
   if (connected) {
-    // Get connection info before exiting subactivity
-    connectedIP = static_cast<WifiSelectionActivity*>(subActivity.get())->getConnectedIP();
-    connectedSSID = WiFi.SSID().c_str();
     isApMode = false;
 
-    exitActivity();
+    // Exit any subactivity if present
+    if (subActivity) {
+      exitActivity();
+    }
 
     // Start mDNS for hostname resolution
     if (MDNS.begin(AP_HOSTNAME)) {

src/activities/network/CrossPointWebServerActivity.h

@@ -24,7 +24,7 @@ enum class WebServerActivityState {
  * CrossPointWebServerActivity is the entry point for file transfer functionality.
  * It:
  * - First presents a choice between "Join a Network" (STA) and "Create Hotspot" (AP)
- * - For STA mode: Launches WifiSelectionActivity to connect to an existing network
+ * - For STA mode: Uses ensureWifiConnected to auto-connect to default WiFi or show WiFi selection
  * - For AP mode: Creates an Access Point that clients can connect to
  * - Starts the CrossPointWebServer when connected
  * - Handles client requests in its loop() function

src/activities/network/WifiSelectionActivity.cpp

@@ -36,6 +36,7 @@ void WifiSelectionActivity::onEnter() {
   usedSavedPassword = false;
   savePromptSelection = 0;
   forgetPromptSelection = 0;
+  setDefaultPromptSelection = 0;
 
   // Trigger first update to show scanning message
   updateRequired = true;
@@ -229,6 +230,28 @@ void WifiSelectionActivity::attemptConnection() {
   }
 }
 
+void WifiSelectionActivity::savePassword() {
+  xSemaphoreTake(renderingMutex, portMAX_DELAY);
+  WIFI_STORE.addCredential(selectedSSID, enteredPassword);
+  xSemaphoreGive(renderingMutex);
+}
+
+void WifiSelectionActivity::displaySetDefaultPrompt() {
+  WIFI_STORE.loadFromFile();
+  const std::string currentDefault = WIFI_STORE.getDefaultSSID();
+  if (selectedSSID != currentDefault) {
+    state = WifiSelectionState::SET_DEFAULT_PROMPT;
+    setDefaultPromptSelection = 0;
+    updateRequired = true;
+  }
+}
+
+void WifiSelectionActivity::setDefaultNetwork() {
+  xSemaphoreTake(renderingMutex, portMAX_DELAY);
+  WIFI_STORE.setDefaultSSID(selectedSSID);
+  xSemaphoreGive(renderingMutex);
+}
+
 void WifiSelectionActivity::checkConnectionStatus() {
   if (state != WifiSelectionState::CONNECTING) {
     return;
@@ -243,16 +266,19 @@ void WifiSelectionActivity::checkConnectionStatus() {
     snprintf(ipStr, sizeof(ipStr), "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
     connectedIP = ipStr;
 
-    // If we entered a new password, ask if user wants to save it
+    // If we entered a new password, save it (with or without prompt based on fromSettingsScreen)
-    // Otherwise, immediately complete so parent can start web server
     if (!usedSavedPassword && !enteredPassword.empty()) {
-      state = WifiSelectionState::SAVE_PROMPT;
+      if (fromSettingsScreen) {
-      savePromptSelection = 0;  // Default to "Yes"
+        // Always save without prompting
-      updateRequired = true;
+        savePassword();
-    } else {
+        displaySetDefaultPrompt();
-      // Using saved password or open network - complete immediately
+
-      Serial.printf("[%lu] [WIFI] Connected with saved/open credentials, completing immediately\n", millis());
+        return;
-      onComplete(true);
+      } else {
+        state = WifiSelectionState::SAVE_PROMPT;
+        savePromptSelection = 0;
+        updateRequired = true;
+      }
     }
     return;
   }
@@ -318,14 +344,50 @@ void WifiSelectionActivity::loop() {
     } else if (mappedInput.wasPressed(MappedInputManager::Button::Confirm)) {
       if (savePromptSelection == 0) {
         // User chose "Yes" - save the password
-        xSemaphoreTake(renderingMutex, portMAX_DELAY);
+        savePassword();
-        WIFI_STORE.addCredential(selectedSSID, enteredPassword);
+        displaySetDefaultPrompt();
-        xSemaphoreGive(renderingMutex);
+      }
+      onComplete(true);
+    }else if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
+    // Skip saving, complete anyway
+      onComplete(true);
+    }
+    return;
+  }
+
+  // Handle set default prompt state
+  if (state == WifiSelectionState::SET_DEFAULT_PROMPT) {
+    if (mappedInput.wasPressed(MappedInputManager::Button::Up) ||
+        mappedInput.wasPressed(MappedInputManager::Button::Left)) {
+      if (setDefaultPromptSelection > 0) {
+        setDefaultPromptSelection--;
+        updateRequired = true;
+      }
+    } else if (mappedInput.wasPressed(MappedInputManager::Button::Down) ||
+               mappedInput.wasPressed(MappedInputManager::Button::Right)) {
+      if (setDefaultPromptSelection < 1) {
+        setDefaultPromptSelection++;
+        updateRequired = true;
+      }
+    } else if (mappedInput.wasPressed(MappedInputManager::Button::Confirm)) {
+      if (setDefaultPromptSelection == 0) {
+        // User chose "Yes" - set as default
+        setDefaultNetwork();
+      }
+      // Disconnect if from settings screen before completing
+      if (fromSettingsScreen) {
+        WiFi.disconnect(false);
+        delay(100);
+        WiFi.mode(WIFI_OFF);
       }
-      // Complete - parent will start web server
       onComplete(true);
     } else if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
-      // Skip saving, complete anyway
+      // Disconnect if from settings screen before completing
+      if (fromSettingsScreen) {
+        WiFi.disconnect(false);
+        delay(100);
+        WiFi.mode(WIFI_OFF);
+      }
       onComplete(true);
     }
     return;
@@ -489,6 +551,9 @@ void WifiSelectionActivity::render() const {
     case WifiSelectionState::SAVE_PROMPT:
       renderSavePrompt();
       break;
+    case WifiSelectionState::SET_DEFAULT_PROMPT:
+      renderSetDefaultPrompt();
+      break;
     case WifiSelectionState::CONNECTION_FAILED:
       renderConnectionFailed();
       break;
@@ -655,6 +720,46 @@ void WifiSelectionActivity::renderSavePrompt() const {
   renderer.drawCenteredText(SMALL_FONT_ID, pageHeight - 30, "LEFT/RIGHT: Select | OK: Confirm");
 }
 
+void WifiSelectionActivity::renderSetDefaultPrompt() const {
+  const auto pageWidth = renderer.getScreenWidth();
+  const auto pageHeight = renderer.getScreenHeight();
+  const auto height = renderer.getLineHeight(UI_10_FONT_ID);
+  const auto top = (pageHeight - height * 3) / 2;
+
+  renderer.drawCenteredText(UI_12_FONT_ID, top - 40, "Connected!", true, EpdFontFamily::BOLD);
+
+  std::string ssidInfo = "Network: " + selectedSSID;
+  if (ssidInfo.length() > 28) {
+    ssidInfo.replace(25, ssidInfo.length() - 25, "...");
+  }
+  renderer.drawCenteredText(UI_10_FONT_ID, top, ssidInfo.c_str());
+
+  renderer.drawCenteredText(UI_10_FONT_ID, top + 40, "Set as default WiFi?");
+
+  // Draw Yes/No buttons
+  const int buttonY = top + 80;
+  constexpr int buttonWidth = 60;
+  constexpr int buttonSpacing = 30;
+  constexpr int totalWidth = buttonWidth * 2 + buttonSpacing;
+  const int startX = (pageWidth - totalWidth) / 2;
+
+  // Draw "Yes" button
+  if (setDefaultPromptSelection == 0) {
+    renderer.drawText(UI_10_FONT_ID, startX, buttonY, "[Yes]");
+  } else {
+    renderer.drawText(UI_10_FONT_ID, startX + 4, buttonY, "Yes");
+  }
+
+  // Draw "No" button
+  if (setDefaultPromptSelection == 1) {
+    renderer.drawText(UI_10_FONT_ID, startX + buttonWidth + buttonSpacing, buttonY, "[No]");
+  } else {
+    renderer.drawText(UI_10_FONT_ID, startX + buttonWidth + buttonSpacing + 4, buttonY, "No");
+  }
+
+  renderer.drawCenteredText(SMALL_FONT_ID, pageHeight - 30, "LEFT/RIGHT: Select | OK: Confirm");
+}
+
 void WifiSelectionActivity::renderConnectionFailed() const {
   const auto pageHeight = renderer.getScreenHeight();
   const auto height = renderer.getLineHeight(UI_10_FONT_ID);

src/activities/network/WifiSelectionActivity.h

@@ -21,14 +21,15 @@ struct WifiNetworkInfo {
 
 // WiFi selection states
 enum class WifiSelectionState {
-  SCANNING,           // Scanning for networks
+  SCANNING,            // Scanning for networks
-  NETWORK_LIST,       // Displaying available networks
+  NETWORK_LIST,        // Displaying available networks
-  PASSWORD_ENTRY,     // Entering password for selected network
+  PASSWORD_ENTRY,      // Entering password for selected network
-  CONNECTING,         // Attempting to connect
+  CONNECTING,          // Attempting to connect
-  CONNECTED,          // Successfully connected
+  CONNECTED,           // Successfully connected
-  SAVE_PROMPT,        // Asking user if they want to save the password
+  SAVE_PROMPT,         // Asking user if they want to save the password
-  CONNECTION_FAILED,  // Connection failed
+  SET_DEFAULT_PROMPT, // Asking user if they want to set as default
-  FORGET_PROMPT       // Asking user if they want to forget the network
+  CONNECTION_FAILED,   // Connection failed
+  FORGET_PROMPT        // Asking user if they want to forget the network
 };
 
 /**
@@ -65,9 +66,13 @@ class WifiSelectionActivity final : public ActivityWithSubactivity {
   // Whether network was connected using a saved password (skip save prompt)
   bool usedSavedPassword = false;
 
-  // Save/forget prompt selection (0 = Yes, 1 = No)
+  // Whether launched from settings screen (affects save behavior and disconnection)
+  bool fromSettingsScreen = false;
+
+  // Save/forget/set default prompt selection (0 = Yes, 1 = No)
   int savePromptSelection = 0;
   int forgetPromptSelection = 0;
+  int setDefaultPromptSelection = 0;
 
   // Connection timeout
   static constexpr unsigned long CONNECTION_TIMEOUT_MS = 15000;
@@ -81,6 +86,7 @@ class WifiSelectionActivity final : public ActivityWithSubactivity {
   void renderConnecting() const;
   void renderConnected() const;
   void renderSavePrompt() const;
+  void renderSetDefaultPrompt() const;
   void renderConnectionFailed() const;
   void renderForgetPrompt() const;
 
@@ -91,10 +97,17 @@ class WifiSelectionActivity final : public ActivityWithSubactivity {
   void checkConnectionStatus();
   std::string getSignalStrengthIndicator(int32_t rssi) const;
 
+  // Helper methods
+  void savePassword();
+  void displaySetDefaultPrompt();
+  void setDefaultNetwork();
+
  public:
   explicit WifiSelectionActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
-                                 const std::function<void(bool connected)>& onComplete)
+                                 const std::function<void(bool connected)>& onComplete,
-      : ActivityWithSubactivity("WifiSelection", renderer, mappedInput), onComplete(onComplete) {}
+                                 bool fromSettingsScreen = false)
+      : ActivityWithSubactivity("WifiSelection", renderer, mappedInput), onComplete(onComplete),
+        fromSettingsScreen(fromSettingsScreen) {}
   void onEnter() override;
   void onExit() override;
   void loop() override;

src/activities/settings/SettingsActivity.cpp

@@ -9,11 +9,12 @@
 #include "CrossPointSettings.h"
 #include "MappedInputManager.h"
 #include "OtaUpdateActivity.h"
+#include "WifiConnectionsActivity.h"
 #include "fontIds.h"
 
 // Define the static settings list
 namespace {
-constexpr int settingsCount = 18;
+constexpr int settingsCount = 19;
 const SettingInfo settingsList[settingsCount] = {
     // Should match with SLEEP_SCREEN_MODE
     SettingInfo::Enum("Sleep Screen", &CrossPointSettings::sleepScreen, {"Dark", "Light", "Custom", "Cover", "None"}),
@@ -40,6 +41,7 @@ const SettingInfo settingsList[settingsCount] = {
     SettingInfo::Enum("Refresh Frequency", &CrossPointSettings::refreshFrequency,
                       {"1 page", "5 pages", "10 pages", "15 pages", "30 pages"}),
     SettingInfo::Action("Calibre Settings"),
+    SettingInfo::Action("WiFi Connections"),
     SettingInfo::Action("Check for updates")};
 }  // namespace
 
@@ -145,6 +147,14 @@ void SettingsActivity::toggleCurrentSetting() {
         updateRequired = true;
       }));
       xSemaphoreGive(renderingMutex);
+    } else if (strcmp(setting.name, "WiFi Connections") == 0) {
+      xSemaphoreTake(renderingMutex, portMAX_DELAY);
+      exitActivity();
+      enterNewActivity(new WifiConnectionsActivity(renderer, mappedInput, [this] {
+        exitActivity();
+        updateRequired = true;
+      }));
+      xSemaphoreGive(renderingMutex);
     } else if (strcmp(setting.name, "Check for updates") == 0) {
       xSemaphoreTake(renderingMutex, portMAX_DELAY);
       exitActivity();

src/activities/settings/WifiConnectionsActivity.cpp

@@ -0,0 +1,271 @@
+#include "WifiConnectionsActivity.h"
+
+#include <GfxRenderer.h>
+#include <HardwareSerial.h>
+
+#include "MappedInputManager.h"
+#include "WifiCredentialStore.h"
+#include "activities/network/WifiSelectionActivity.h"
+#include "fontIds.h"
+
+namespace {
+constexpr int PAGE_ITEMS = 23;
+constexpr int SKIP_PAGE_MS = 700;
+constexpr unsigned long IGNORE_INPUT_MS = 300;
+}
+
+void WifiConnectionsActivity::taskTrampoline(void* param) {
+  auto* self = static_cast<WifiConnectionsActivity*>(param);
+  self->displayTaskLoop();
+}
+
+void WifiConnectionsActivity::onEnter() {
+  ActivityWithSubactivity::onEnter();
+
+  renderingMutex = xSemaphoreCreateMutex();
+  state = State::LIST;
+  selectorIndex = 0;
+  settingsSelection = 0;
+  selectedNetwork.clear();
+  enterTime = millis();
+  updateRequired = true;
+
+  WIFI_STORE.loadFromFile();
+
+  xTaskCreate(&WifiConnectionsActivity::taskTrampoline, "WifiConnectionsTask",
+              4096,
+              this,
+              1,
+              &displayTaskHandle
+  );
+}
+
+void WifiConnectionsActivity::onExit() {
+  ActivityWithSubactivity::onExit();
+
+  xSemaphoreTake(renderingMutex, portMAX_DELAY);
+  if (displayTaskHandle) {
+    vTaskDelete(displayTaskHandle);
+    displayTaskHandle = nullptr;
+  }
+  vSemaphoreDelete(renderingMutex);
+  renderingMutex = nullptr;
+}
+
+void WifiConnectionsActivity::loop() {
+  if (subActivity) {
+    subActivity->loop();
+    return;
+  }
+
+  const unsigned long timeSinceEnter = millis() - enterTime;
+  if (timeSinceEnter < IGNORE_INPUT_MS) {
+    return;
+  }
+
+  if (state == State::SETTINGS_MENU) {
+    // Check if this network is already the default
+    WIFI_STORE.loadFromFile();
+    const std::string currentDefault = WIFI_STORE.getDefaultSSID();
+    const bool isDefault = (selectedNetwork == currentDefault);
+    
+    // Handle settings menu
+    if (mappedInput.wasReleased(MappedInputManager::Button::Up) ||
+        mappedInput.wasReleased(MappedInputManager::Button::Left)) {
+      if (settingsSelection > 0) {
+        settingsSelection--;
+        updateRequired = true;
+      }
+    } else if (mappedInput.wasReleased(MappedInputManager::Button::Down) ||
+               mappedInput.wasReleased(MappedInputManager::Button::Right)) {
+      if (settingsSelection < 1) {
+        settingsSelection++;
+        updateRequired = true;
+      }
+    } else if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
+      if (settingsSelection == 0) {
+        if (isDefault) {
+          removeDefault();
+        } else {
+          setDefault();
+        }
+      } else {
+        deleteNetwork();
+      }
+    } else if (mappedInput.wasReleased(MappedInputManager::Button::Back)) {
+      cancelSettings();
+    }
+    return;
+  }
+
+  // Handle list navigation
+  const auto& credentials = WIFI_STORE.getCredentials();
+  const size_t totalItems = credentials.size() + 1;  // +1 for "Add new connection"
+
+  const bool prevReleased = mappedInput.wasReleased(MappedInputManager::Button::Up) ||
+                            mappedInput.wasReleased(MappedInputManager::Button::Left);
+  const bool nextReleased = mappedInput.wasReleased(MappedInputManager::Button::Down) ||
+                            mappedInput.wasReleased(MappedInputManager::Button::Right);
+  const bool skipPage = mappedInput.getHeldTime() > SKIP_PAGE_MS;
+
+  if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
+    if (selectorIndex == 0) {
+      // "Add new connection" selected - launch WiFi selection
+      xSemaphoreTake(renderingMutex, portMAX_DELAY);
+      exitActivity();
+      enterNewActivity(new WifiSelectionActivity(renderer, mappedInput, [this](bool connected) {
+        // Reload credentials after WiFi selection
+        WIFI_STORE.loadFromFile();
+        exitActivity();
+        enterTime = millis();  // Reset enter time to ignore input after subactivity exits
+        updateRequired = true;
+      }, true));  // true = fromSettingsScreen (always save password and disconnect after)
+      xSemaphoreGive(renderingMutex);
+    } else {
+      // Regular credential selected
+      handleSettings();
+    }
+  } else if (mappedInput.wasReleased(MappedInputManager::Button::Back)) {
+    onBack();
+  } else if (prevReleased) {
+    if (skipPage) {
+      selectorIndex = ((selectorIndex / PAGE_ITEMS - 1) * PAGE_ITEMS + totalItems) % totalItems;
+    } else {
+      selectorIndex = (selectorIndex + totalItems - 1) % totalItems;
+    }
+    updateRequired = true;
+  } else if (nextReleased) {
+    if (skipPage) {
+      selectorIndex = ((selectorIndex / PAGE_ITEMS + 1) * PAGE_ITEMS) % totalItems;
+    } else {
+      selectorIndex = (selectorIndex + 1) % totalItems;
+    }
+    updateRequired = true;
+  }
+}
+
+void WifiConnectionsActivity::handleSettings() {
+  const auto& credentials = WIFI_STORE.getCredentials();
+  // selectorIndex 0 is "Add new connection", so credentials start at index 1
+  if (selectorIndex == 0 || selectorIndex > credentials.size()) {
+    return;
+  }
+
+  selectedNetwork = credentials[selectorIndex - 1].ssid;
+  state = State::SETTINGS_MENU;
+  settingsSelection = 0;
+  updateRequired = true;
+}
+
+void WifiConnectionsActivity::setDefault() {
+  xSemaphoreTake(renderingMutex, portMAX_DELAY);
+  WIFI_STORE.setDefaultSSID(selectedNetwork);
+  xSemaphoreGive(renderingMutex);
+
+  state = State::LIST;
+  selectedNetwork.clear();
+  updateRequired = true;
+}
+
+void WifiConnectionsActivity::removeDefault() {
+  xSemaphoreTake(renderingMutex, portMAX_DELAY);
+  WIFI_STORE.setDefaultSSID("");
+  xSemaphoreGive(renderingMutex);
+
+  state = State::LIST;
+  selectedNetwork.clear();
+  updateRequired = true;
+}
+
+void WifiConnectionsActivity::deleteNetwork() {
+  xSemaphoreTake(renderingMutex, portMAX_DELAY);
+  WIFI_STORE.removeCredential(selectedNetwork);
+  xSemaphoreGive(renderingMutex);
+
+  // Reload to get updated list
+  WIFI_STORE.loadFromFile();
+
+  const auto& credentials = WIFI_STORE.getCredentials();
+  const size_t totalItems = credentials.size() + 1;
+  if (selectorIndex > credentials.size()) {
+    selectorIndex = credentials.size();
+  }
+
+  state = State::LIST;
+  selectedNetwork.clear();
+  updateRequired = true;
+}
+
+void WifiConnectionsActivity::cancelSettings() {
+  state = State::LIST;
+  selectedNetwork.clear();
+  updateRequired = true;
+}
+
+void WifiConnectionsActivity::displayTaskLoop() {
+  while (true) {
+    if (updateRequired && !subActivity) {
+      updateRequired = false;
+      xSemaphoreTake(renderingMutex, portMAX_DELAY);
+      render();
+      xSemaphoreGive(renderingMutex);
+    }
+    vTaskDelay(10 / portTICK_PERIOD_MS);
+  }
+}
+
+void WifiConnectionsActivity::render() {
+  renderer.clearScreen();
+
+  const auto pageWidth = renderer.getScreenWidth();
+  const auto pageHeight = renderer.getScreenHeight();
+
+  renderer.drawCenteredText(UI_12_FONT_ID, 15, "WiFi Connections", true, EpdFontFamily::BOLD);
+
+  if (state == State::SETTINGS_MENU) {
+    const int centerY = pageHeight / 2;
+    renderer.drawCenteredText(UI_10_FONT_ID, centerY - 40, "Settings", true, EpdFontFamily::BOLD);
+    renderer.drawCenteredText(UI_10_FONT_ID, centerY - 20, selectedNetwork.c_str());
+
+    // Check if this network is already the default
+    const std::string currentDefault = WIFI_STORE.getDefaultSSID();
+    const bool isDefault = (selectedNetwork == currentDefault);
+
+    const char* defaultText = settingsSelection == 0 
+      ? (isDefault ? "> Remove Default" : "> Set Default")
+      : (isDefault ? "  Remove Default" : "  Set Default");
+    const char* deleteText = settingsSelection == 1 ? "> Delete" : "  Delete";
+    renderer.drawCenteredText(UI_10_FONT_ID, centerY + 20, defaultText);
+    renderer.drawCenteredText(UI_10_FONT_ID, centerY + 40, deleteText);
+
+    const auto labels = mappedInput.mapLabels("Cancel", "Confirm", "", "");
+    renderer.drawButtonHints(UI_10_FONT_ID, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
+  } else {
+    const auto& credentials = WIFI_STORE.getCredentials();
+
+    const auto labels = mappedInput.mapLabels("« Back", selectorIndex == 0 ? "Add" : "Settings", "", "");
+    renderer.drawButtonHints(UI_10_FONT_ID, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
+
+    const size_t totalItems = credentials.size() + 1;
+    const auto pageStartIndex = selectorIndex / PAGE_ITEMS * PAGE_ITEMS;
+    const std::string& defaultSSID = WIFI_STORE.getDefaultSSID();
+    renderer.fillRect(0, 60 + (selectorIndex % PAGE_ITEMS) * 30 - 2, pageWidth - 1, 30);
+    
+    for (size_t i = pageStartIndex; i < totalItems && i < pageStartIndex + PAGE_ITEMS; i++) {
+      std::string displayText;
+      if (i == 0) {
+        displayText = "+ Add new connection";
+      } else {
+        displayText = credentials[i - 1].ssid;
+        if (credentials[i - 1].ssid == defaultSSID) {
+          displayText += " [Default]";
+        }
+      }
+      auto item = renderer.truncatedText(UI_10_FONT_ID, displayText.c_str(), renderer.getScreenWidth() - 40);
+      renderer.drawText(UI_10_FONT_ID, 20, 60 + (i % PAGE_ITEMS) * 30, item.c_str(), i != selectorIndex);
+    }
+  }
+
+  renderer.displayBuffer();
+}
+

src/activities/settings/WifiConnectionsActivity.h

@@ -0,0 +1,50 @@
+#pragma once
+#include <freertos/FreeRTOS.h>
+#include <freertos/semphr.h>
+#include <freertos/task.h>
+
+#include <functional>
+#include <string>
+
+#include "activities/ActivityWithSubactivity.h"
+
+/**
+ * Activity for managing saved WiFi connections.
+ * Shows a list of saved WiFi networks and allows deletion with confirmation.
+ */
+class WifiConnectionsActivity final : public ActivityWithSubactivity {
+ public:
+  explicit WifiConnectionsActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
+                                   const std::function<void()>& onBack)
+      : ActivityWithSubactivity("WifiConnections", renderer, mappedInput), onBack(onBack) {}
+
+  void onEnter() override;
+  void onExit() override;
+  void loop() override;
+
+ private:
+  enum class State {
+    LIST,
+    SETTINGS_MENU
+  };
+
+  TaskHandle_t displayTaskHandle = nullptr;
+  SemaphoreHandle_t renderingMutex = nullptr;
+  bool updateRequired = false;
+  State state = State::LIST;
+  size_t selectorIndex = 0;
+  int settingsSelection = 0;
+  std::string selectedNetwork;
+  unsigned long enterTime = 0;
+  const std::function<void()> onBack;
+
+  static void taskTrampoline(void* param);
+  [[noreturn]] void displayTaskLoop();
+  void render();
+  void handleSettings();
+  void setDefault();
+  void removeDefault();
+  void deleteNetwork();
+  void cancelSettings();
+};
+