private String mProductID = "YOUR_PRODUCT_ID";
private String mDevName = "YOUR_DEVICE_NAME";
private String mDevPSK = "YOUR_DEV_PSK";
private String mCertFilePath = null;
private String mPrivKeyFilePath = null;
TXMqttConnection mqttconnection = new TXMqttConnection(mProductID, mDevName, mDevPSK, new callBack());
mqttconnection.connect(options, null);
try {
        Thread.sleep(20000);
} catch (InterruptedException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}
mqttconnection.disConnect(null);