Using fetch to send data for custom DynDNS service?

RouterOS Scripting
1

Hi, I’m not still sure how really fetch works, but my aint is to try to create a custom “DynDNS” service for my hosts.
I have a TCP server running on port 999, so I would send “something” from my RB.

First step: check data to port 999, I open whireshark listening on port 999, then I execute fetch command

fetch address=192.168.1.75 port=999 mode=http/ftp src-path="pippo.txt"
   status: connecting

I have no incoming requests on port 999… why?

(pippo.txt is a log file contained on “File” directory of my RB, I would make a string “I’am RB750” to save in this file to send to server).

Is it possible?
Thanks.

2

There is no such mode as http/ftp, use iether http or ftp
and to send file you need “upload=yes”

3

To make custom application supporting fetch tool, what should I search for?