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Nextion NX4832K035_011R , add function

Hello, I have one problem with UART and waveform (add function)
I use wept function to send from MCU one byte to the screen.
Now, I read the EEPROM and store the value in variable (n0 or va0 or sys0)
Next, i try to work with add 1,0,n0.val or add 1,0,va0.val or add 1,0,sys0 and I doesn't work. there is nothing on screen.
How could I send valur from MCU via UART to NEXTION?
Thanks

Waveform has range 0 to 255, 1 pixel per value

   add 1,0,0ÿÿÿ

   add 1,0,73ÿÿÿ

   add 1,0,147ÿÿÿ

   add 1,0,255ÿÿÿ

Waveform can not do by variable

   add 1,0,n0.valÿÿÿ

   add 1,0,va0.valÿÿÿ

   add 1,0,sys0ÿÿÿ

Maybe seen on forum many times where users wish

- but such wish results in error

Nextion Editor v0.46 has added add by variable

   add 1,0,n0.valÿÿÿ

   add 1,0,va0.valÿÿÿ

   add 1,0,sys0ÿÿÿ

These now work as well


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