Message when button is not clicked anymore

I'm really new to this. I started 4 days ago.
I'm building a bluetooth controlled car with an arduino
And wanted to make an app to control the car.
What I want is that when I click on a button...say forward
Then the bluetooth sends a string "f"
That much I can do
However when I stop clicking it... I want to send a string "s". Which I fail to do so.
I was using the touch.up command


What about trying a search in the community to find some examples? For example


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