How to obtain the transmission time from the wireless router to the mobile phone by Android

want to measure the signal transmission time from the phone to the wifi, check the Android API and find no relevant information.
main idea:

  1. Android receives information from the router;
  2. then read the time when the message was sent and the time it was received
Wifi android
Mar.07,2021

check the delay by using the IP, of the router under Android's shell,ping

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e4878a-44cb6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e4878a-44cb6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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