The liveness timeout is the length of time the server allows a remote to be idle. If the remote does not communicate with
the server for l seconds, the server assumes that the remote has lost the connection, and terminates the sync. The remote
automatically sends periodic messages to the server to keep the connection alive.
If a negative value is set, an exception is thrown. The value may be changed by the MobiLink server without notice. This change
occurs if the value is set too low or too high.