
626
■
Handbook on Mobile and Ubiquitous Computing: Status and Perspective
Message type
Message
length
Sequence
number
Reserved
Command ID
Payload (optional)
Payload (optional)
(a)
11632
Data type Data type size Payload
(b)
11632
Figure 25.21 LTI protocol messages. (a) LTI protocol header. (b) LTI payload unit.
The default settings configure LTI as a local socket (also known as a Unix socket), which, as the
name implies, allows local processes to connect to marnetd using a special node in the filesystem
(usually /tmp/marnetd-lti). Privilege checks are then conducted by the operating system
kernel. It is also possible to connect to remote nodes using an encrypted