fix(Android): getCurrentWifiSSID return null if '<unknown ssid>' (#148)

README.md

@@ -179,6 +179,11 @@ Used on iOS. If true, the network is WEP Wi-Fi; otherwise it is a WPA or WPA2 pe
 
 ### `getCurrentWifiSSID(): Promise`
 
+Returns the SSID of the current WiFi network.
+
+#### Errors:
+ * `CouldNotDetectSSID`: Not connected or connecting.
+
 ## Only iOS
 
 The following methods work only on iOS

android/src/main/java/com/reactlibrary/rnwifi/RNWifiModule.java

@@ -24,6 +24,7 @@
 import com.reactlibrary.rnwifi.errors.DisconnectErrorCodes;
 import com.facebook.react.bridge.ReadableMap;
 import com.facebook.react.bridge.WritableArray;
+import com.reactlibrary.rnwifi.errors.GetCurrentWifiSSIDErrorCodes;
 import com.reactlibrary.rnwifi.errors.IsRemoveWifiNetworkErrorCodes;
 import com.reactlibrary.rnwifi.errors.LoadWifiListErrorCodes;
 import com.reactlibrary.rnwifi.receivers.WifiScanResultReceiver;
@@ -304,6 +305,12 @@ public void getCurrentWifiSSID(final Promise promise) {
             ssid = ssid.substring(1, ssid.length() - 1);
         }
 
+        // Android returns `<unknown ssid>` when it is not connected or still connecting
+        if (ssid.equals("<unknown ssid>")) {
+            promise.reject(GetCurrentWifiSSIDErrorCodes.CouldNotDetectSSID.toString(), "Not connected or connecting.");
+            return;
+        }
+
         promise.resolve(ssid);
     }
 

android/src/main/java/com/reactlibrary/rnwifi/errors/GetCurrentWifiSSIDErrorCodes.kt

@@ -0,0 +1,8 @@
+package com.reactlibrary.rnwifi.errors
+
+enum class GetCurrentWifiSSIDErrorCodes {
+    /**
+     * Not connected or connecting.
+     */
+    CouldNotDetectSSID,
+}

lib/types/index.d.ts

@@ -102,6 +102,13 @@ declare module 'react-native-wifi-reborn' {
         isWEP: boolean
     ): Promise<void>;
 
+    export enum GET_CURRENT_WIFI_SSID_ERRRORS {
+        CouldNotDetectSSID = 'CouldNotDetectSSID',
+    }
+
+    /**
+     * Returns the name of the currently connected WiFi. When not connected, the promise will be or null when not connected.
+     */
     export function getCurrentWifiSSID(): Promise<string>;
 
     //#region iOS only