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Android JSch session closes after two commands
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    new Thread(new Runnable()
    {
        public void run()
        {
            connectSSH();
        }
    }).start();
}

private void connectSSH()
{
    JSch jsch = new JSch();
    try {
        session = jsch.getSession("door", "my server",22);

    } catch (JSchException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    session.setPassword("pass");
    session.setConfig("StrictHostKeyChecking", "no");
    try {
        session.connect(40000);
        channel = session.openChannel("exec");
    } catch (JSchException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}

public void unlock(View view) {
    ((ChannelExec)channel).setCommand("python /home/door/doorUnlocker.py unlock");
    try {
        channel.connect();
    } catch (JSchException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    channel.disconnect();
}

public void lock(View view) {
    ((ChannelExec)channel).setCommand("python /home/door/doorUnlocker.py lock");
    try {
        channel.connect();
    } catch (JSchException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    channel.disconnect();
}