wifi: implement station change and connect

src/peripherals/storage/wifistore.rs

@@ -55,18 +55,18 @@ impl WifiStore {
         match nvs_lock.get::<bool>(&NVS_NAMESPACE_WIFI, &NVS_WIFI_INITIALIZED_KEY) {
             Ok(initialized) => {
                 log::debug!("initialization_check: initialized {initialized:?}");
-                return Ok(true);
+                Ok(true)
             }
             Err(esp_nvs::error::Error::NamespaceNotFound) => {
                 log::debug!("initialization_check: error: namespace not found");
-                return Ok(false);
+                Ok(false)
             }
             Err(esp_nvs::error::Error::KeyNotFound) => {
                 log::debug!("initialization_check: error: key not found");
-                return Ok(false);
+                Ok(false)
             }
-            Err(error) => return Err(error.into()),
-        };
+            Err(error) => Err(error.into()),
+        }
     }
 
     async fn initialize(nvs: &Mutex<Nvs>) -> Result<(), WifiStoreError> {
@@ -74,14 +74,14 @@ impl WifiStore {
 
         let mut nvs_lock = nvs.lock().await;
 
-        log::debug!("initialization: write dummy ssid");
+        log::debug!("initialization: write empty ssid");
         nvs_lock.set::<&str>(
             &NVS_NAMESPACE_WIFI,
             &NVS_WIFI_SSID_KEY,
             ""
         )?;
 
-        log::debug!("initialization: write dummy pass");
+        log::debug!("initialization: write empty pass");
         nvs_lock.set::<&str>(
             &NVS_NAMESPACE_WIFI,
             &NVS_WIFI_PASS_KEY,
@@ -99,18 +99,22 @@ impl WifiStore {
         Ok(())
     }
 
-    pub async fn load_credentials(&self) -> Result<WifiCredentials, WifiStoreError> {
+    pub async fn load_credentials(&self) -> Result<Option<WifiCredentials>, WifiStoreError> {
         log::debug!("loading wifi credentials");
         log::debug!("loading ssid");
         let mut nvs_lock = self.nvs.lock().await;
         let ssid = nvs_lock.get::<String>(&NVS_NAMESPACE_WIFI, &NVS_WIFI_SSID_KEY)?;
+        if ssid.is_empty() {
+            return Ok(None);
+        }
         log::debug!("ssid: {ssid}");
 
         log::debug!("loading pass");
         let pass = nvs_lock.get::<String>(&NVS_NAMESPACE_WIFI, &NVS_WIFI_PASS_KEY)?;
+
         log::debug!("pass: {pass}");
 
-        Ok(WifiCredentials{ssid, pass})
+        Ok(Some(WifiCredentials{ssid, pass}))
     }
 
     pub async fn save_credentials(&self, credentials: &WifiCredentials) -> Result<(), WifiStoreError> {