Could I set key and listen a stream with each other?

[Arafa-microsys]

I want to use setString() with Stream check available() with each other in the same loop, but the exception (29) leak of mem happened.
Can anyone help me to overcome this problem?
I know this is might be the same problem #193
but now we in 2020 and the original problem from 2016, So the library updated now and I think the old solution in #193 It's no longer valid.