No return value

[baseliners]

Hi - I'm trying to use this with Ulysses (I originally tried Rob Walton's modules but they did not work and looks like the root cause might be xcall). When I try the following:

xcall.app/Contents/MacOS/xcall -url "ulysses://x-callback-url/get-version"

.. it opens Ulysses in the background (even though it looks like it shouldn't since activateApp has been omitted) but then does not return anything and just waits (no error returned either). Any ideas? I'm on macOS 10.14.3. Thanks!