SENA LS110 - Manual (Page 35)

35
4.1.5 UDP Tunneling Mode Operations
The UDP tunneling mode operation is similar to that of TCP server/client mode except that it is based
on UDP protocol and only one pre-defined remote host is able to communicate with the LS110. Users
do not have to configure the parameter of inactivity timeout, since UDP is a connectionless protocol.
1) Operations
If a remote host sends a UDP datagram to the UDP Local port of the LS110, it checks if the IP address
of the host is the same as the pre-defined Destination IP address. If the IP addresses are the same,
the LS110 transfers the data through the serial port. Otherwise, the LS110 discards the incoming UDP
datagram.
If there is any incoming data from the serial port, the LS110 transfers the data to the remote host
defined as Destination IP & Port. Although the remote port is not open, the LS110 does not transfer the
data again.
2) Parameters
 Local port
The concept is the same as that of TCP communication. See 4.1.2 TCP Server Mode Operations
for details.
 Remote IP address (or domain name) and Remote Port
The concept is the same as that of TCP communication. See 4.1.3 TCP Client Mode Operations
for details.
4.1.6 UDP Server Mode Operations
While UDP tunneling mode allows only one remote host for UDP communications, UDP server mode
allows any remote host to access the LS110. In this mode, the LS110 gets the information on the
remote host from the latest incoming datagram information and keeps this information for inactivity
timeout management. (see 4.3.2 Inactivity Timeout for detail).
1) Operations
In UDP server mode, a remote host should initiate UDP data communication. If there is any incoming
UDP datagram to the LS110, it will make a virtual connection with the remote host for inactivity timeout
duration. Before the inactivity timeout value expires, the LS110 transfers the UDP data to the serial