---
name: "udplsi"
section: "1"
platform: "linux"
package: "ion"
version: "3.2.1+dfsg-1.1"
release: "Debian 9 (Stretch)"
platforms: ["linux"]
url: "https://new.carta.tech/udplsi"
---

# udplsi(1)

UDP-based LTP link service input task

## NAME

udplsi - UDP-based LTP link service input task

## SYNOPSIS

**udplsi** {*local\_hostname* \| @}\[:*local\_port\_nbr*\]

## DESCRIPTION

**udplsi** is a background "daemon" task that receives UDP datagrams via a UDP socket bound to *local\_hostname* and *local\_port\_nbr*, extracts LTP segments from those datagrams, and passes them to the local LTP engine. Host name "@" signifies that the host name returned by [*hostname*(1)](/hostname/1.md) is to be used as the socket's host name.  If not specified, port number defaults to 1113.

The link service input task is spawned automatically by **ltpadmin** in response to the 's' command that starts operation of the LTP protocol; the text of the command that is used to spawn the task must be provided as a parameter to the 's' command.  The link service input task is terminated by **ltpadmin** in response to an 'x' (STOP) command.

## EXIT STATUS

- "0"

  **udplsi** terminated normally, for reasons noted in the **ion.log** file.  If this termination was not commanded, investigate and solve the problem identified in the log file and use **ltpadmin** to restart **udplsi**.

- "1"

  **udplsi** terminated abnormally, for reasons noted in the **ion.log** file. Investigate and solve the problem identified in the log file, then use **ltpadmin** to restart **udplsi**.

## FILES

No configuration files are needed.

## ENVIRONMENT

No environment variables apply.

## DIAGNOSTICS

The following diagnostics may be issued to the **ion.log** log file:

- udplsi can't initialize LTP.

  **ltpadmin** has not yet initialized LTP protocol operations.

- LSI task is already started.

  Redundant initiation of **udplsi**.

- LSI can't open UDP socket

  Operating system error.  Check errtext, correct problem, and restart **udplsi**.

- LSI can't initialize socket

  Operating system error.  Check errtext, correct problem, and restart **udplsi**.

- LSI can't create receiver thread

  Operating system error.  Check errtext, correct problem, and restart **udplsi**.

## BUGS

Report bugs to \<ion-bugs@korgano.eecs.ohiou.edu\>

## SEE ALSO

[*ltpadmin*(1)](/ltpadmin/1.md), [*udplso*(1)](/udplso/1.md), [*owltsim*(1)](/owltsim/1.md)