> For the complete documentation index, see [llms.txt](https://picoctf2021.haydenhousen.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://picoctf2021.haydenhousen.com/reverse-engineering/speeds-and-feeds.md).

# speeds and feeds

## Problem

> There is something on my shop network running at mercury.picoctf.net:16524, but I can't tell what it is. Can you?

## Solution

1. We can use `nc` to connect to the challenge and output the commands to a file: `nc mercury.picoctf.net 16524 > cnc_command.txt`
2. Searching for `What language does a CNC machine use?` finds that the answer is `g-code` Searching for `simulate g-code` finds [NCViewer](https://ncviewer.com/) ([WebGCode](https://nraynaud.github.io/webgcode/) is another option).
3. We can paste in the contents of [cnc\_command.txt](https://github.com/HHousen/PicoCTF-2021/blob/master/Reverse%20Engineering/speeds%20and%20feeds/cnc_command.txt) into the "GCode File" panel and then click "Plot" to view the flag.

### Flag

`picoCTF{num3r1cal_c0ntr0l_1395ffad}`