# Show abbreviations completely in some parts of the text

I am writing my thesis and am using abbreviations. I have a tex file where I list all my abbreviations:

\chapter*{Abbreviations}
\begin{acronym}
\acro{UI}{User Interface}
\acro{IoT}{Internet of Things}
\end{acronym}


In the tex file where I have the documentation, I am using the \usepackage[printonlyused]{acronym} and I refer to my abbreviation like this \acr{IoT}. The first one is shown like this Internet of Things (IoT) and then the others like this IoT. How can I make the abbreviation show completely in some parts of text except the first time that I am using the abbreviation? Thanks!!

I found \acf which does that job.
\ac{IoT} is \acf{IoT}