SSH Client with a simple connection and run an simple command. For to connect with a normal user without many privileges since to use the root user more processes. Iptables to open a port is enabled as follows: iptables -A INPUT -p tcp -m tcp --dport <port> -j ACCEPT

sshclient.py

#!/usr/bin/env python3

import os
import sys 
import paramiko

class SSHClient:
    
    def __init__(self,hostname, port, username, password):
        self._port = port
        self._hostname = hostname   
        self._username = username
        self._password = password
    
    def log(self,filename):
        """
        with this line you create a log file to see more details of your connection and your ssh client
        """
        paramiko.util.log_to_file( filename + '.log' ) 
    
    def init_client(self):
        # create your ssh client object and initialize it
        ssh_client = paramiko.SSHClient()

        # add a policy to accept user authentication services
        ssh_client.set_missing_host_key_policy(paramiko.MissingHostKeyPolicy())
        try:
            # starts the connection if no exception is successfully made    
            ssh_client.connect(self._hostname , port=self._port, username=self._username, password=self._password)
            print('Connected successfully')
            # executes the command at the moment only executes simple commands, like: ls, less, who, cat, cd 
            stdin, stdout, stderr = ssh_client.exec_command("ls -la /home")
            # see the output status of the channel that implicitly opens the paramiko
            stdout.channel.recv_exit_status()
            # if applicable read the output lines as commands that give an example of output ls, less, who, cat, cd 
            lines = stdout.readlines()
            for line in lines:
                print(line)
            ssh_client.close()
        except paramiko.ssh_exception.AuthenticationException as message:
            print(message)
        except paramiko.ssh_exception.SSHException as message:
            print(message)
        except paramiko.AuthenticationException as message:
            print(message)

def main(argv):
    ssh_client = SSHClient("127.0.0.1",22,"youruser","yourpassword")
    ssh_client.log('ssh_client')
    ssh_client.init_client()
    
if __name__ == '__main__':
    main(sys.argv[1:])