How to get Transmission package Timestamp from ESP8266 I am trying to make an Indoor positioning system using ESP8266 as a beacon, how do I get the transmission package timestamp from router to ESP8266 and vice-versa?

Thank you in advance for any advice
You can use timestamp from NTP client and attach it 

Install NTPclient library from Arduino library manager
This library uses WiFiUdp library to connect to the NTP server, so download that too 

Then you can just update the time every time your sending/receiving something and log it as and how you see fit!