void switch0PopCallback(void *ptr) {
    uint32_t dual_state;
    NexDSButton *btn = (NexDSButton *)ptr;
    dbSerialPrintln("switch0PopCallback");
    dbSerialPrint("ptr=");
    dbSerialPrintln((uint32_t)ptr);
    memset(buffer, 0, sizeof(buffer));

    /* Get the state value of dual state button component . */
    switch0.getValue(&dual_state);
    if(dual_state)
    {
    //  client.publish("NextionSwitch/switch0/Power", "true");
    digitalWrite(D1,LOW);
    p1l2.setText("HI! OPEN STATE");
    }
    else
    {
    //  client.publish("NextionSwitch/switch0/Power", "false");
    digitalWrite(D1,HIGH);
    p1l2.setText("HI! OFF STATE");
    }
}