The method Praha recommends is the correct way to launch Connect Mobile. connectpro:// is really only intended to allow the Connect Server to launch the app from the device's browser.
There is no way at present to have the new meeting open if the user is already attending a meeting on the device. They will need to exit the existing meeting first, otherwise launching the app just brings the app forward, with the existing meeting open. This is the same way the add-in works on desktop I believe.
