- """
- Open a connection to the protection server. A PTS object is
- essentially a handle to talk to the server in a given cell.
-
- cell defaults to None. If no argument is passed for cell, PTS
- connects to the home cell.
-
- sec is the security level, an integer from 0 to 3:
- - 0: unauthenticated connection
- - 1: try authenticated, then fall back to unauthenticated
- - 2: fail if an authenticated connection can't be established
- - 3: same as 2, plus encrypt all traffic to the protection
- server
- """