Go to Calibre, choose “Preferences” and “Change calibre behavior.”
Choose “Sharing over the net”.
Enter an optional port number, username and password.
Click “Start Server”.
Now Calibre should be running.
Make note of the IP address or local name of your computer.
Connect to Calibre using OPDS:
Launch Marvin, tap the Cloud icon at the bottom of the home screen and choose OPDS.
In the favourites popup, tap the button to create a new favourite.
In the new popup, give your favourite a friendly name such as “My Laptop”.
In the address field. Type in the address of the computer running Calibre, the port and “/opds” at the end. Remember the colon between the IP address of your computer and the port number.
A typical Calibre address will look like - 192.168.0.2:8080/opds
You can enter a user name and password if you set one up.
Save your new favourite.
Test everything by choosing your computer from the favourites popup. You should see something like: