Posting data with ESP8266 module?
ESP8266.println("AT+CIPSTART=\"TCP\",\"192.168.1.13\test\",3000");


That line is going to fail miserably for a number of reasons:


You need to provide an IP address or domain name - NOT a URL
Even if you could provide a URL this bit 192.168.1.13\test would end up, after C escaping, as 92.168.1.13        est since \t is a TAB character.


And then on top of all that I assume you are connecting to a HTTP server, yet you aren't sending a HTTP request, you are just sending the word "test", which the HTTP server has no hope of ever understanding.

You need to formulate and send a proper HTTP request and send it to the server. I suggest you go and look at a few tutorials and maybe look up how HTTP Servers actually operate and what the protocol looks like.