\begin{tikzpicture}[
  node distance=0.8cm and 1.1cm,
  box/.style={draw, rounded corners, minimum width=3cm, minimum height=1cm, align=center},
  arrow/.style={-{Stealth}, thick},
  decision/.style={diamond, draw, aspect=2, align=center},
  io/.style={trapezium, trapezium left angle=70, trapezium right angle=110, draw, minimum width=2.5cm, align=center}
]

% Nodes
\node[box] (start) {record\_card():\\ Init PcscLink, Card, Recorder};
\node[box, below=of start] (scenarioLoop) {For each Scenario\\ Instantiate and Run Scenario.run(card)};
\node[box, below=of scenarioLoop] (isdrcall) {Card ISD-R command};

% Mutation engine path
\node[decision, below=of isdrcall] (mutateQ) {Mutation\\ Engine?};

\node[box, right=1.2cm of mutateQ] (originalAPDU) {Send original APDU};
\node[box, left=1.2cm of mutateQ] (mutateAPDU) {Get next mutation\\ and Mutate APDU};

\node[box, below=of mutateQ] (sendAPDU) {Transmit APDU to card};
\node[box, below=of sendAPDU] (record) {Record mutation result\\ in OperationRecorder};

% Error / reset path
\node[decision, below=of record] (errorQ) {Exception\\ during scenario?};
\node[box, left=of errorQ] (logFail) {Log failure\\ in current\\ mutation node};
\node[box, below=of errorQ] (checkTree) {All mutations tried?};

\node[box, right=of checkTree] (repeatScenario) {Repeat Scenario};
\node[box, below=of checkTree] (saveFile) {Save .resim file};
\node[box, below=of saveFile] (clearReset) {Clear recorder,\\ Reset card};

% Arrows
\draw[arrow] (start) -- (scenarioLoop);
\draw[arrow] (scenarioLoop) -- (isdrcall);
\draw[arrow] (isdrcall) -- (mutateQ);

\draw[arrow] (mutateQ) -- node[above] {No} (originalAPDU);
\draw[arrow] (mutateQ) -- node[above] {Yes} (mutateAPDU);

\draw[arrow] (mutateAPDU) |- (sendAPDU);
\draw[arrow] (originalAPDU) |- (sendAPDU);

\draw[arrow] (sendAPDU) -- (record);
\draw[arrow] (record) -- (errorQ);

\draw[arrow] (errorQ) -- node[above] {Yes} (logFail);
\draw[arrow] (logFail) |- (checkTree);

\draw[arrow] (errorQ) -- node[right] {No} (checkTree);

\draw[arrow] (checkTree) -- node[above] {No} (repeatScenario);
\draw[arrow] (checkTree) -- node[right] {Yes} (saveFile);
\draw[arrow] (saveFile) -- (clearReset);

\end{tikzpicture}