[Solved] move files older than 30 days from one computer to another using rsync

I have a laptop and a phone in which termux is installed. I want to move files from my phone to my computer using rsync if all files are older than 30 days. I think I should use find command with -exec rsync.

find . -mtime +30 -exec rsync something 

but the problem is my phone's IP address is always changing so how do I transfer file? I have to run this script in my laptop

solution

i wrote a script which move files and runs in my laptop

1. i can't use hostname because I am on android 9 and don't want to install anything else.
2. most of the time I am offline so using any internet service is not a good idea ( my devices are connected in themselves )

here is my script

#!/usr/bin/bash

#checking if script not already running and exit if already running
[ "${FLOCKER}" != "$0" ] && exec env FLOCKER="$0" flock -en "$0" "$0" "$@" || :

set -e

TARGET_MAC="d2:1c:3c:3d:6a:a7"
RSYNC_LOG="$HOME/log/rsync_log.txt"  # Rclone log file


function get_ip() {
  # need to edit sudoers file to run 	sudo nmap -sn 192.168.43.0/24 without password
  # Allow members of group sudo to execute any command
  # %sudo	ALL=(ALL:ALL) ALL
  # 'username' ALL=(ALL) NOPASSWD: /usr/bin/nmap -sn 192.168.43.0/24


	sudo nmap -sn 192.168.43.0/24 | grep --before-context=3 -i "$TARGET_MAC" | tail -n 3 | head -n 1 | awk '{ print $6 }' | sed 's/[()]//g'; }


# run command only if wifi is connected
if echo $(nmcli general status) | grep -q -w "connected" ; then

  # for ssh to work in a changing IP address, a configuration line has to be enabled so that it does not ask for yes/no while connecting to a changed ip address
	TARGET_IP=$(get_ip)
  ssh -p 8022  "$TARGET_IP" 'find /data/data/com.termux/files/home/storage/shared/Pictures/ -mtime +30  -type d,f -printf %P\\0' | rsync --append --update --times --atimes --mkpath --verbose --human-readable --remove-source-files --log-file="$HOME/log/synced.log" --exclude='.dtrash' --files-from=- --from0  -e "ssh -p 8022" "$TARGET_IP":/data/data/com.termux/files/home/storage/shared/Pictures/ $HOME/Pictures