Connection problem in smack Client is not connected or not connected

Question

I’m working on a mobile chat application, for the last few days I began to encounter problems with connection (my case works fine for the first time, but when my application disconnected (having lost a network connection or disconnected Wi-Fi or a bad network), then my application is reconnected but cannot send messages, but at the same time, the application can receive a message): To reconnect, I use reconnectionmanager

I am using smack4.1 library.

Error Details: The client is not connected or not connected

Thank you my connection and reconnection code -

XMPPTCPConnectionConfiguration.Builder connConfig = XMPPTCPConnectionConfiguration
                        .builder();
                connConfig
                        .setSecurityMode(ConnectionConfiguration.SecurityMode.disabled);
                connConfig.setUsernameAndPassword(user, pass);
                connConfig.setServiceName(SERVICE_NAME);
                connConfig.setHost(SERVER_HOST);
                connConfig.setPort(SERVER_PORT);
                connConfig.setDebuggerEnabled(true);
                connConfig.setConnectTimeout(25000);
                XMPPTCPConnectionConfiguration configuration = connConfig.build();
                connection = new XMPPTCPConnection(configuration);
                connection.setUseStreamManagement(true);
                connection.setUseStreamManagementResumption(true);
                connection.setReplyToUnknownIq(true);
                connection.setPacketReplyTimeout(25000);
                ReconnectionManager manager = ReconnectionManager.getInstanceFor(connection);
                manager.setFixedDelay(10);
                ReconnectionManager.setDefaultReconnectionPolicy                  (ReconnectionManager.ReconnectionPolicy.FIXED_DELAY);
                manager.enableAutomaticReconnection();
                ReconnectionManager.setEnabledPerDefault(true);

                connection.addConnectionListener(new ConnectionListener() {
                    @Override
                    public void connected(XMPPConnection xmppConnection) {

                        IsConnected = true;
                    }

                    @Override
                    public void authenticated(XMPPConnection xmppConnection, boolean bt) {}

                    @Override
                    public void connectionClosed() {


                        IsConnected = false;
                    }

                    @Override
                    public void connectionClosedOnError(Exception e) {

                        IsConnected = false;

                    }

                    @Override
                    public void reconnectionSuccessful() {
                        IsConnected = true;
                                         }

                    @Override
                    public void reconnectingIn(int i) {
                 }

                    @Override
                    public void reconnectionFailed(Exception e) {
                                                  }
                });


        } catch (Exception ex) {
            ex.printStackTrace();
        }

To send a message to user connection.sendStanza (messsageObj);