# Having issue running ipc app on localhost

**URL:** <https://forum.legato.io/t/having-issue-running-ipc-app-on-localhost/6639>\
**Category:** Legato Application Framework\
**Created:** [November 18, 2023, 4:26am UTC](https://forum.legato.io/t/having-issue-running-ipc-app-on-localhost/6639 "2023-11-18T04:26:10Z")\
**Posts on this page:** 1\
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**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\
**Post date:** [November 18, 2023, 4:34am UTC](https://forum.legato.io/t/having-issue-running-ipc-app-on-localhost/6639/2 "2023-11-18T04:34:33Z")

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not sure if this is OK to run in localhost.  
Normally we run the IPC in WP module:

> [@Cannot get callback between components (IPC) to work properly](https://forum.legato.io/t/cannot-get-callback-between-components-ipc-to-work-properly/4653):
>
> Hi, I’m currently working on an application that must send data from one component (component A) to the other (component B) (via IPC). The sending part is implemented via API in component B. communication.api FUNCTION send ( char buffer[BUFFER\_SIZE] IN ); However component B can have data ready at any time for component A. For this case I want to use a callback to send data from component B to component A. I tried the following: communication.api DEFINE BUFFER\_SIZE = 64; HANDLER o…

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