 compare two ArrayBuffer or Uint8Array
  const compare = (a, b) => {
    const p = toUint8Array(a);
    const q = toUint8Array(b);
    return !!p && !!q && p.every((item, index) => { return item === q[index]; });
  };

  const stash = new Stash(stashIds.toReceiver, stashIds.toController);

  let connection, count = 0;

  const addConnection = c => {
    let result = [], testCase;
    connection = c;
    count++;

    connection.onmessage = event => {
      // PresentationConnection_send-manual.https.html
  