Digi WAN 3G User Manual page 20

Serial data communication over TCP and UDP
Digi devices support serial data communication over TCP and UDP. Key features include:
Serial data communication over TCP, also known as autoconnect and tcpserial can

automatically perform the following functions:
– Establish bidirectional TCP connections, known as autoconnections, between the serial
device and a server or other network device. Autoconnections can be made based on
data and or serial hardware signals.
– Control forwarding characteristics based on size, time, and pattern
– Allow incoming raw, Telnet, and SSL/TLS (secure-socket) connections
– Support RFC 2217, an extension of the Telnet protocol
 Serial data communication over UDP, also known as udpserial, can automatically
perform the following functions:
– Digi Connect products can automatically send serial data to one or more devices or
systems on the network using UDP sockets. Options for sending data include whether
specific data is on the serial line, a specific time period has elapsed, or after the specified
number of bytes has been received on the serial port.
– Control forwarding characteristics based on size, time, and patterns.
– Support incoming datagrams from multiple destinations.
– Support outgoing datagrams sent to multiple destinations.
TCP/UDP forwarding characteristics.

Extended communication control on TCP/UDP data paths.

– Timeout
– Hangup
– User-configurable Socket ID string (text string identifier on autoconnect only)
Dynamic Host Configuration Protocol (DHCP)
Dynamic Host Configuration Protocol (DHCP) can be used to automatically assign IP addresses,
deliver TCP/IP stack configuration parameters such as the subnet mask and default router, and
provide other configuration information. For further details, see "Configure an IP address using
DHCP" on page 39.
Auto-IP
Auto-IP is a protocol that will automatically assign an IP address from a reserved pool of standard
Auto-IP addresses to the computer on which it is installed. For Digi devices are set to obtain its IP
address automatically from a DHCP server and the DHCP server is unavailable or nonexistent,
Auto-IP will assign the device an IP address. For further details, see "Configure an IP address
using Auto-IP" on page 39.
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