feat(net): Add method Network.isOnline()

Author: me-no-dev

libraries/Network/src/NetworkManager.cpp

@@ -185,6 +185,18 @@ NetworkInterface *NetworkManager::getDefaultInterface() {
   return NULL;
 }
 
+bool NetworkManager::isOnline() {
+  for (int i = 0; i < ESP_NETIF_ID_MAX; ++i) {
+    if (i != ESP_NETIF_ID_AP) {
+      NetworkInterface *iface = getNetifByID((Network_Interface_ID)i);
+      if (iface != NULL && (iface->hasIp() || iface->hasGlobalIPv6())) {
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
 size_t NetworkManager::printTo(Print &out) const {
   size_t bytes = 0;
 

libraries/Network/src/NetworkManager.h

@@ -22,6 +22,9 @@ class NetworkManager : public NetworkEvents, public Printable {
   bool setDefaultInterface(NetworkInterface &ifc);
   NetworkInterface *getDefaultInterface();
 
+  // Returns true if any interface (except AP) has assigned IPv4 or global IPv6
+  bool isOnline();
+
   size_t printTo(Print &out) const;
 
   static const char *getHostname();