Search for a filename on remote server. If found, send its name to host server

Question

I'm starting with python3 and stuck with following problem. I will be thankful for any help to unblock me.

Requirement:

1. run python script on host server to do following:
2. from host server, ssh to a remote server.
3. search for a file if its present on the remote server.
4. if present, send its name to the host server.
5. else, print following on host server "file not found on remote server".

Sample code:

import sys
import getopt
import os
from os import path
import re
import copy
import getpass
import time
import socket
import re

bin_ver = "1.99"
chip = "6233"

remote_bin_path = "/path/of/the/binary/release/v"+bin_ver+"/bin/"
print("path of binary on remote server is " + remote_bin_path)

os.getcwd()
os.chdir(remote_bin_path) 
os.getcwd()

if (chip == "6233" or chip == "62334"):
    sub_ver = "ab"
else:
    sub_ver = "xy"

print("sub_ver is: " + sub_ver)

search_string = "*" + chip + "*" + sub_ver + "*"
print("search_string is " + search_string)
cmd = "ls -1 " + search_string
print("cmd is " + cmd)

required_file = os.popen(cmd).read()
print("INFO: required file is \n"+required_file)

Input dataset: sample file names present on remote server:

binary-v1.99-6233b0-ab-cde-1.2.3.bin
binary-v1.99-62334a0-xy-cde-1.2.3.bin
binary-v1.99-62334b0-ab-cde-1.2.3.bin
binary-v1.99-62334a0-xy-cde-1.2.3.bin
binary-v1.99-6278b0-ab-cde-1.2.3.bin
binary-v1.99-6277a0-ab-cde-1.2.3.bin

Problem with above implementation:

This code runs fine on the host server, but the issue is it returns 2 file names:

binary-v1.99-6233b0-ab-cde-1.2.3.bin
binary-v1.99-62334b0-ab-cde-1.2.3.bin

Since the input variable chip = "6233", i do not want the output corresponding to 62334. How to set the correct word boundary for 6233 in search_string variable?

Next Setps:

How can I run this script on the remote server and return the filename to the host server.