Update examples.

examples/DataChangesListener/Callback/Callback.ino

@@ -157,6 +157,8 @@ void setup()
 
   // You can use TCP KeepAlive For more reliable stream operation and tracking the server connection status, please read this for detail.
   // https://github.com/mobizt/Firebase-ESP8266#enable-tcp-keepalive-for-reliable-http-streaming
+  // You can use keepAlive in ESP8266 core version newer than v3.1.2.
+  // Or you can use git version (v3.1.2) https://github.com/esp8266/Arduino
   // stream.keepAlive(5, 5, 1);
 
   if (!Firebase.beginStream(stream, "/test/stream/data"))
@@ -215,4 +217,10 @@ void loop()
     dataChanged = false;
     // When stream data is available, do anything here...
   }
+
+  // After calling stream.keepAlive, now we can track the server connecting status
+  if (!stream.httpConnected())
+  {
+    // Server was disconnected!
+  }
 }

examples/DataChangesListener/MultiPath/MultiPath.ino

@@ -165,6 +165,8 @@ void setup()
 
   // You can use TCP KeepAlive For more reliable stream operation and tracking the server connection status, please read this for detail.
   // https://github.com/mobizt/Firebase-ESP8266#enable-tcp-keepalive-for-reliable-http-streaming
+  // You can use keepAlive in ESP8266 core version newer than v3.1.2.
+  // Or you can use git version (v3.1.2) https://github.com/esp8266/Arduino
   // stream.keepAlive(5, 5, 1);
 
   // The data under the node being stream (parent path) should keep small
@@ -241,4 +243,10 @@ void loop()
     dataChanged = false;
     // When stream data is available, do anything here...
   }
+
+  // After calling stream.keepAlive, now we can track the server connecting status
+  if (!stream.httpConnected())
+  {
+    // Server was disconnected!
+  }
 }

examples/DataChangesListener/NoCallback/NoCallback.ino

@@ -118,6 +118,8 @@ void setup()
 
   // You can use TCP KeepAlive For more reliable stream operation and tracking the server connection status, please read this for detail.
   // https://github.com/mobizt/Firebase-ESP8266#enable-tcp-keepalive-for-reliable-http-streaming
+  // You can use keepAlive in ESP8266 core version newer than v3.1.2.
+  // Or you can use git version (v3.1.2) https://github.com/esp8266/Arduino
   // stream.keepAlive(5, 5, 1);
 
   if (!Firebase.beginStream(stream, "/test/stream/data"))
@@ -203,4 +205,10 @@ void loop()
     Serial.printf("Free Heap, %d\n", (int)ESP.getFreeHeap());
     Serial.println();
   }
+
+  // After calling stream.keepAlive, now we can track the server connecting status
+  if (!stream.httpConnected())
+  {
+    // Server was disconnected!
+  }
 }

examples/DataChangesListener/SingleDataObject/SingleDataObject.ino

@@ -123,6 +123,8 @@ void setup()
 
   // You can use TCP KeepAlive For more reliable stream operation and tracking the server connection status, please read this for detail.
   // https://github.com/mobizt/Firebase-ESP8266#enable-tcp-keepalive-for-reliable-http-streaming
+  // You can use keepAlive in ESP8266 core version newer than v3.1.2.
+  // Or you can use git version (v3.1.2) https://github.com/esp8266/Arduino
   // fbdo.keepAlive(5, 5, 1);
 
   // The data under the node being stream (parent path) should keep small
@@ -169,4 +171,10 @@ void loop()
                     fbdo.stringData().c_str());
     }
   }
+
+  // After calling stream.keepAlive, now we can track the server connecting status
+  if (!fbdo.httpConnected())
+  {
+    // Server was disconnected!
+  }
 }