@kl3m3n Thanks for your answer. Yes this is (micro)python, used on an ESP32.

I think I found it: just make a composite string for the entire ble message

text = f'@text TXT:"{red} {green} {blue}"\r\n'
ble.write(text)

Hi,
I'd like to update the text of a label using values coming from sliders. I create a text variable containing the content I want to show in the label, such as

text = f'{red} {green} {blue}'

How can I display this text in my label? It seems I can only use fixed texts and not dynamic texts.

If I try

ble.write("@text TXT:text\r\n")

the label only displays 'text', instead of something like '125, 34 56'

More generally, can I use the color values from the sliders to change the BCG of another widget?