| server 側でプログラムを実行したところ |
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| client 側でプログラムを実行したところ |
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| server 側に client が送った文字列が表示される |
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これは日々の作業を通して学んだことや毎日の生活で気づいたことをを記録しておく備忘録である。
HTML ファイル生成日時: 2025/04/03 13:41:35.024 (台灣標準時)
Python で、 socket を使った通信を行う方法を調べてみたので、わかったこ とを記録しておくでござる。
まず、 client が serverに文字列を送り、 server がそれを受け取る、とい うことを考えるでござる。 server 側のプログラムは以下のように書けばよい ようでござる。
#!/usr/pkg/bin/python3.13 # # Time-stamp: <2025/03/14 12:37:13 (UT+08:00) daisuke> # ########################################################################### # # importing modules # # importing argparse module import argparse # importing socket module import socket ########################################################################### ########################################################################### # # command-line argument analysis # # initialising a parser object descr = f'server program for socket communication' parser = argparse.ArgumentParser (description=descr) # default values default_server = '192.168.29.50' default_port = 12345 default_maxlength = 256 # adding arguments parser.add_argument ('-s', '--server', default=default_server, \ help=f'IP address of server (default: {default_server})') parser.add_argument ('-p', '--port', default=default_port, \ help=f'port number on server (default: {default_port})') parser.add_argument ('-l', '--maxlength', default=default_maxlength, \ help=f'maximum length of message (default: {default_maxlength})') # parsing arguments args = parser.parse_args () # arguments server_address = args.server server_port = args.port maxlength = args.maxlength ########################################################################### ########################################################################### # # communication with client using socket # # opening socket with socket.socket (socket.AF_INET, socket.SOCK_STREAM) as skt: # binding socket skt.bind ( (server_address, server_port) ) # starting to listen to client skt.listen () # accepting connection connection, address = skt.accept () # receiving message from client data_from_client_byte = connection.recv (maxlength) # converting message from client into UTF-8 string data_from_client_str = data_from_client_byte.decode ('utf-8') # printing received message print (f'Message received from client:') print (f'{data_from_client_str}') ###########################################################################
client 側のプログラムは以下のようにすればよいようでござる。
#!/usr/pkg/bin/python3.13 # # Time-stamp: <2025/03/14 12:37:21 (UT+08:00) daisuke> # ########################################################################### # # importing modules # # importing argparse module import argparse # importing socket module import socket ########################################################################### ########################################################################### # # command-line argument analysis # # initialising a parser object descr = f'client program for socket communication' parser = argparse.ArgumentParser (description=descr) # default values default_server = '192.168.29.50' default_port = 12345 default_maxlength = 256 # adding arguments parser.add_argument ('-s', '--server', default=default_server, \ help=f'IP address of server (default: {default_server})') parser.add_argument ('-p', '--port', default=default_port, \ help=f'port number on server (default: {default_port})') parser.add_argument ('-l', '--maxlength', default=default_maxlength, \ help=f'maximum length of message (default: {default_maxlength})') parser.add_argument ('command', nargs='+', \ help=f'command to be sent to server') # parsing arguments args = parser.parse_args () # arguments server_address = args.server server_port = args.port maxlength = args.maxlength list_command = args.command ########################################################################### # # constructing a command to be sent to server # # initialisation of command to be sent to server command_to_server_str = '' # making a command for i in range ( len (list_command) ): command_to_server_str = f'{command_to_server_str} {list_command[i]}' # removing leading white space command_to_server_str = command_to_server_str.lstrip () # conversion from string into byte command_to_server_byte = command_to_server_str.encode () ########################################################################### ########################################################################### # # communication with server using socket # # opening socket with socket.socket (socket.AF_INET, socket.SOCK_STREAM) as skt: # connecting to server skt.connect ( (server_address, server_port) ) # sending a message to server skt.sendall (command_to_server_byte) ###########################################################################
192.168.29.50 で test_socket_00_server.py を実行するでござ る。すると、このプログラムは、 client からの接続を待つでござる。
% python3.13 test_socket_00_server.py
server が待ち受けている状態で、別の計算機で test_socket_00_client.py を実行するでござる。
% python3.13 test_socket_00_client.py pointing 12.34 56.78
すると、 server 側に client 側から送った文字列が表示されるでござる。
Message received from client: pointing 12.34 56.78
| server 側でプログラムを実行したところ |
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| client 側でプログラムを実行したところ |
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| server 側に client が送った文字列が表示される |
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server は常に動いていて、常時コマンドを受け付けるようにしておくと、実 用的な用途に使えそうでござる。 client からのメッセージを一回だけ受け取 り、受け取ったら終了するのではなく、 client からのメッセージを受け取っ たら、また次のメッセージを待ち受けるようにするには、 server 側のプログ ラムを以下のようにすればよいようでござる。
#!/usr/pkg/bin/python3.13 # # Time-stamp: <2025/03/14 12:37:34 (UT+08:00) daisuke> # ########################################################################### # # importing modules # # importing argparse module import argparse # importing socket module import socket ########################################################################### ########################################################################### # # command-line argument analysis # # initialising a parser object descr = f'server program for socket communication' parser = argparse.ArgumentParser (description=descr) # default values default_server = '192.168.29.50' default_port = 12345 default_maxlength = 256 # adding arguments parser.add_argument ('-s', '--server', default=default_server, \ help=f'IP address of server (default: {default_server})') parser.add_argument ('-p', '--port', default=default_port, \ help=f'port number on server (default: {default_port})') parser.add_argument ('-l', '--maxlength', default=default_maxlength, \ help=f'maximum length of message (default: {default_maxlength})') # parsing arguments args = parser.parse_args () # arguments server_address = args.server server_port = args.port maxlength = args.maxlength ########################################################################### ########################################################################### # # communication with client using socket # # opening socket with socket.socket (socket.AF_INET, socket.SOCK_STREAM) as skt: # binding socket skt.bind ( (server_address, server_port) ) # starting to listen to client skt.listen () # waiting for connection from client while (True): # accepting connection connection, address = skt.accept () # connecting with client with connection: # receiving message from client data_from_client_byte = connection.recv (maxlength) # converting message from client into UTF-8 string data_from_client_str = data_from_client_byte.decode ('utf-8') # printing received message print (f'Message received from client:') print (f'{data_from_client_str}') # starting to wait for next connection if not data_from_client_byte: break ###########################################################################
client 側のプログラムは以下のものでござる。
#!/usr/pkg/bin/python3.13 # # Time-stamp: <2025/03/14 12:37:38 (UT+08:00) daisuke> # ########################################################################### # # importing modules # # importing argparse module import argparse # importing socket module import socket ########################################################################### ########################################################################### # # command-line argument analysis # # initialising a parser object descr = f'client program for socket communication' parser = argparse.ArgumentParser (description=descr) # default values default_server = '192.168.29.50' default_port = 12345 default_maxlength = 256 # adding arguments parser.add_argument ('-s', '--server', default=default_server, \ help=f'IP address of server (default: {default_server})') parser.add_argument ('-p', '--port', default=default_port, \ help=f'port number on server (default: {default_port})') parser.add_argument ('-l', '--maxlength', default=default_maxlength, \ help=f'maximum length of message (default: {default_maxlength})') parser.add_argument ('command', nargs='+', \ help=f'command to be sent to server') # parsing arguments args = parser.parse_args () # arguments server_address = args.server server_port = args.port maxlength = args.maxlength list_command = args.command ########################################################################### # # constructing a command to be sent to server # # initialisation of command to be sent to server command_to_server_str = '' # making a command for i in range ( len (list_command) ): command_to_server_str = f'{command_to_server_str} {list_command[i]}' # removing leading white space command_to_server_str = command_to_server_str.lstrip () # conversion from string into byte command_to_server_byte = command_to_server_str.encode () ########################################################################### ########################################################################### # # communication with server using socket # # opening socket with socket.socket (socket.AF_INET, socket.SOCK_STREAM) as skt: # connecting to server skt.connect ( (server_address, server_port) ) # sending a message to server skt.sendall (command_to_server_byte) ###########################################################################
server 側で test_socket_01_server.py を実行するでござる。
% python3.13 test_socket_01_server.py
client 側で test_socket_01_client.py を実行するでござる。
% python3.13 test_socket_01_client.py pointing 12.34 56.78
すると、 server 側に client が送ったメッセージが表示されるでござる。
% python3.13 test_socket_01_server.py Message received from client: pointing 12.34 56.78
server は、次のメッセージを待っているので、また client 側のプログラム を実行してみるでござる。
% python3.13 test_socket_01_client.py pointing 23.45 6.78
server 側に、二つ目のメッセージが表示されるでござる。
% python3.13 test_socket_01_server.py Message received from client: pointing 12.34 56.78 Message received from client: pointing 23.45 6.78
server は、ずっと client からの接続を待ち続けるでござる。
| server 側でプログラムを実行 |
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| client 側でプログラムを実行 |
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| server 側に client の送った文字列が表示される |
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| 再度 client 側でプログラムを実行 |
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| また server 側に client が送った文字列が表示される |
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client が server にコマンドを送るだけでなく、 server は受け取ったコマ ンドについて、受け付けた旨を client に送り返すようにすると便利そうでご ざる。 server 側のプログラムは以下のようにすればよいようでござる。
#!/usr/pkg/bin/python3.13 # # Time-stamp: <2025/03/14 12:37:44 (UT+08:00) daisuke> # ########################################################################### # # importing modules # # importing argparse module import argparse # importing socket module import socket # importing time module import time ########################################################################### ########################################################################### # # parameters # # file to store telescope status file_status = 'status.txt' ########################################################################### ########################################################################### # # command-line argument analysis # # initialising a parser object descr = f'server program for socket communication' parser = argparse.ArgumentParser (description=descr) # default values default_server = '192.168.29.50' default_port = 12345 default_maxlength = 256 # adding arguments parser.add_argument ('-s', '--server', default=default_server, \ help=f'IP address of server (default: {default_server})') parser.add_argument ('-p', '--port', default=default_port, \ help=f'port number on server (default: {default_port})') parser.add_argument ('-l', '--maxlength', default=default_maxlength, \ help=f'maximum length of message (default: {default_maxlength})') # parsing arguments args = parser.parse_args () # arguments server_address = args.server server_port = args.port maxlength = args.maxlength ########################################################################### ########################################################################### # # functions # def is_valid_command (command): # initialisation of parameter 'valid' valid = False # splitting command list_command = command.split () # checking command match list_command[0]: case 'gohome' | 'goflatscreen' | 'pointing' | 'status' | 'tracking': valid = True case _: valid = False # return validity of command return valid def write_status (filename, telescope_status): with open (filename, 'w') as fh_w: fh_w.write (f'{telescope_status}\n') return (0) def execute_gohome (command): print (f'Now, going to home position...') write_status (file_status, f'status: busy (moving to home position)\n') time.sleep (15) write_status (file_status, f'status: idling\n') print (f'Finished going to home position!') return (0) def execute_goflatscreen (command): print (f'Now, going to flatfield screen...') write_status (file_status, f'status: busy (moving to flatfield screen)\n') time.sleep (15) write_status (file_status, f'status: idling\n') print (f'Finished going to flatfield screen!') return (0) def execute_pointing (command): print (f'Now, pointing telescope to the target...') write_status (file_status, f'status: busy (pointing target object)\n') time.sleep (15) write_status (file_status, f'status: idling\n') print (f'Finished pointing telescope to the target!') return (0) def execute_status (command): print (f'Now, checking telescope status') write_status (file_status, f'status: busy (checking status)\n') time.sleep (3) write_status (file_status, f'status: idling\n') print (f'Finished checking telescope status!') return (0) def execute_tracking (command): print (f'Now, changing tracking mode...') write_status (file_status, f'status: busy (changing tracking mode)\n') time.sleep (5) write_status (file_status, f'status: idling\n') print (f'Finished changing tracking mode!') return (0) ########################################################################### ########################################################################### # # communication with client using socket # # opening socket with socket.socket (socket.AF_INET, socket.SOCK_STREAM) as skt: # binding socket skt.bind ( (server_address, server_port) ) # starting to listen to client skt.listen () # waiting for connection from client while (True): # accepting connection connection, address = skt.accept () # connecting with client with connection: # receiving message from client data_from_client_byte = connection.recv (maxlength) # converting message from client into UTF-8 string data_from_client_str = data_from_client_byte.decode ('utf-8') # printing received message print (f'Message received from client:') print (f'{data_from_client_str}') # checking validity of command valid = is_valid_command (data_from_client_str) # message sent back to client if (valid): message_str = f'following command received:\n' \ + f'{data_from_client_str}\n' else: message_str = f'command is invalid!\n' \ + f'{data_from_client_str}' # conversion from string into byte message_byte = message_str.encode () # sending a message back to client connection.sendall (message_byte) # executing command list_command = data_from_client_str.split () match list_command[0]: case 'gohome': execute_gohome (data_from_client_str) case 'goflatscreen': execute_goflatscreen (data_from_client_str) case 'pointing': execute_pointing (data_from_client_str) case 'status': execute_status (data_from_client_str) case 'tracking': execute_tracking (data_from_client_str) # starting to wait for next connection if not data_from_client_byte: break ###########################################################################
client 側のプログラムは以下のようにしてみたでござる。
#!/usr/pkg/bin/python3.13 # # Time-stamp: <2025/03/14 12:37:49 (UT+08:00) daisuke> # ########################################################################### # # importing modules # # importing argparse module import argparse # importing socket module import socket ########################################################################### ########################################################################### # # command-line argument analysis # # initialising a parser object descr = f'client program for socket communication' parser = argparse.ArgumentParser (description=descr) # default values default_server = '192.168.29.50' default_port = 12345 default_maxlength = 256 # adding arguments parser.add_argument ('-s', '--server', default=default_server, \ help=f'IP address of server (default: {default_server})') parser.add_argument ('-p', '--port', default=default_port, \ help=f'port number on server (default: {default_port})') parser.add_argument ('-l', '--maxlength', default=default_maxlength, \ help=f'maximum length of message (default: {default_maxlength})') parser.add_argument ('command', nargs='+', \ help=f'command to be sent to server') # parsing arguments args = parser.parse_args () # arguments server_address = args.server server_port = args.port maxlength = args.maxlength list_command = args.command ########################################################################### # # constructing a command to be sent to server # # initialisation of command to be sent to server command_to_server_str = '' # making a command for i in range ( len (list_command) ): command_to_server_str = f'{command_to_server_str} {list_command[i]}' # removing leading white space command_to_server_str = command_to_server_str.lstrip () # conversion from string into byte command_to_server_byte = command_to_server_str.encode () ########################################################################### ########################################################################### # # communication with server using socket # # opening socket with socket.socket (socket.AF_INET, socket.SOCK_STREAM) as skt: # connecting to server skt.connect ( (server_address, server_port) ) # sending a message to server skt.sendall (command_to_server_byte) # receiving a message from server reply_from_server_byte = skt.recv (maxlength) # conversion from byte into string reply_from_server_str = reply_from_server_byte.decode ('utf-8') # printing a message from server print (f'Reply from server:') print (f'{reply_from_server_str}') ###########################################################################
server 側で test_socket_02_server.py を実行するでござる。
% python3.13 test_socket_02_server.py
client 側で test_socket_02_client.py を実行するでござる。
% python3.13 test_socket_02_client.py pointing 12.34 56.78 Reply from server: following command received: pointing 12.34 56.78
server 側からの応答が表示されたでござる。 server 側では、 client から のコマンドを受け取ったことが表示されているでござる。
% python3.13 test_socket_02_server.py Message received from client: pointing 12.34 56.78 Now, pointing telescope to the target...
しばらくすると、動作が完了したことが表示されるでござる。
% python3.13 test_socket_02_server.py Message received from client: pointing 12.34 56.78 Now, pointing telescope to the target... Finished pointing telescope to the target!
もう一度、 client 側でプログラムを実行してみるでござる。
% python3.13 test_socket_02_client.py status Reply from server: following command received: status
server 側では、 client から送られてきたコマンドが表示されるでござる。
% python3.13 test_socket_02_server.py Message received from client: pointing 12.34 56.78 Now, pointing telescope to the target... Finished pointing telescope to the target! Message received from client: status Now, checking telescope status Finished checking telescope status!
| server 側でプログラムを実行したところ |
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| client 側でプログラムを実行したところ |
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| server 側で処理が始まる |
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| server 側で処理が終了 |
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| client 側でもう一度コマンドを実行 |
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| server 側で処理が終了 |
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server が client からの要請を受けて何か処理をしている間は、別のコマン ドを送っても応答しないのでは不便でござる。 server が複数の接続を並行し て処理するようにするには、 server 側のプログラムを以下のようにすればよ いようでござる。
#!/usr/pkg/bin/python3.13 # # Time-stamp: <2025/03/14 12:37:54 (UT+08:00) daisuke> # ########################################################################### # # importing modules # # importing argparse module import argparse # importing socket module import socket # importing threading module import threading # importing time module import time ########################################################################### ########################################################################### # # parameters # # file to store telescope status file_status = 'status.txt' ########################################################################### ########################################################################### # # command-line argument analysis # # initialising a parser object descr = f'server program for socket communication' parser = argparse.ArgumentParser (description=descr) # default values default_server = '192.168.29.50' default_port = 12345 default_maxlength = 256 # adding arguments parser.add_argument ('-s', '--server', default=default_server, \ help=f'IP address of server (default: {default_server})') parser.add_argument ('-p', '--port', default=default_port, \ help=f'port number on server (default: {default_port})') parser.add_argument ('-l', '--maxlength', default=default_maxlength, \ help=f'maximum length of message (default: {default_maxlength})') # parsing arguments args = parser.parse_args () # arguments server_address = args.server server_port = args.port maxlength = args.maxlength ########################################################################### ########################################################################### # # functions # def is_valid_command (command): # initialisation of parameter 'valid' valid = False # splitting command list_command = command.split () # checking command match list_command[0]: case 'gohome' | 'goflatscreen' | 'pointing' | 'status' | 'tracking': valid = True case _: valid = False # return validity of command return valid def write_status (filename, telescope_status): with open (filename, 'w') as fh_w: fh_w.write (f'{telescope_status}\n') return (0) def read_status (filename): with open (filename, 'r') as fh_r: telescope_status = fh_r.read () return (telescope_status) def execute_gohome (command): print (f'Now, going to home position...') write_status (file_status, f'status: busy (moving to home position)\n') time.sleep (15) write_status (file_status, f'status: idling\n') print (f'Finished going to home position!') return (0) def execute_goflatscreen (command): print (f'Now, going to flatfield screen...') write_status (file_status, f'status: busy (moving to flatfield screen)\n') time.sleep (15) write_status (file_status, f'status: idling\n') print (f'Finished going to flatfield screen!') return (0) def execute_pointing (command): print (f'Now, pointing telescope to the target...') write_status (file_status, f'status: busy (pointing target object)\n') time.sleep (15) write_status (file_status, f'status: idling\n') print (f'Finished pointing telescope to the target!') return (0) def execute_status (command): print (f'Now, checking telescope status') # checking telescope status telescope_status = read_status (file_status) print (f'Finished checking telescope status!') return (telescope_status) def execute_tracking (command): print (f'Now, changing tracking mode...') write_status (file_status, f'status: busy (changing tracking mode)\n') time.sleep (5) write_status (file_status, f'status: idling\n') print (f'Finished changing tracking mode!') return (0) def process_request_from_client (connection, address): # connecting with client with connection: # receiving message from client data_from_client_byte = connection.recv (maxlength) # converting message from client into UTF-8 string data_from_client_str = data_from_client_byte.decode ('utf-8') # printing received message print (f'Message received from client:') print (f'{data_from_client_str}') # checking validity of command valid = is_valid_command (data_from_client_str) # message sent back to client if (valid): message_str = f'following command received:\n' \ + f'{data_from_client_str}\n' else: message_str = f'command is invalid!\n' \ + f'{data_from_client_str}' # conversion from string into byte message_byte = message_str.encode () # sending a message back to client connection.sendall (message_byte) # executing command list_command = data_from_client_str.split () match list_command[0]: case 'gohome': execute_gohome (data_from_client_str) case 'goflatscreen': execute_goflatscreen (data_from_client_str) case 'pointing': execute_pointing (data_from_client_str) case 'status': telescope_status = execute_status (data_from_client_str) telescope_status_byte = telescope_status.encode () connection.sendall (telescope_status_byte) case 'tracking': execute_tracking (data_from_client_str) ########################################################################### ########################################################################### # # communication with client using socket # # opening socket with socket.socket (socket.AF_INET, socket.SOCK_STREAM) as skt: # binding socket skt.bind ( (server_address, server_port) ) # starting to listen to client skt.listen () # waiting for connection from client while (True): # accepting connection connection, address = skt.accept () # starting a new thread and processing request from client thread = threading.Thread (target=process_request_from_client, \ args=(connection, address) ) thread.start () ###########################################################################
client 側のプログラムは以下のようにすればよいようでござる。
#!/usr/pkg/bin/python3.13 # # Time-stamp: <2025/03/14 12:37:59 (UT+08:00) daisuke> # ########################################################################### # # importing modules # # importing argparse module import argparse # importing socket module import socket ########################################################################### ########################################################################### # # command-line argument analysis # # initialising a parser object descr = f'client program for socket communication' parser = argparse.ArgumentParser (description=descr) # default values default_server = '192.168.29.50' default_port = 12345 default_maxlength = 256 # adding arguments parser.add_argument ('-s', '--server', default=default_server, \ help=f'IP address of server (default: {default_server})') parser.add_argument ('-p', '--port', default=default_port, \ help=f'port number on server (default: {default_port})') parser.add_argument ('-l', '--maxlength', default=default_maxlength, \ help=f'maximum length of message (default: {default_maxlength})') parser.add_argument ('command', nargs='+', \ help=f'command to be sent to server') # parsing arguments args = parser.parse_args () # arguments server_address = args.server server_port = args.port maxlength = args.maxlength list_command = args.command ########################################################################### # # constructing a command to be sent to server # # initialisation of command to be sent to server command_to_server_str = '' # making a command for i in range ( len (list_command) ): command_to_server_str = f'{command_to_server_str} {list_command[i]}' # removing leading white space command_to_server_str = command_to_server_str.lstrip () # conversion from string into byte command_to_server_byte = command_to_server_str.encode () ########################################################################### ########################################################################### # # communication with server using socket # # opening socket with socket.socket (socket.AF_INET, socket.SOCK_STREAM) as skt: # connecting to server skt.connect ( (server_address, server_port) ) # sending a message to server skt.sendall (command_to_server_byte) # receiving a message from server reply_from_server_byte = skt.recv (maxlength) # conversion from byte into string reply_from_server_str = reply_from_server_byte.decode ('utf-8') # printing a message from server print (f'Reply from server:') print (f'{reply_from_server_str}') # receiving telescope status if (list_command[0] == 'status'): telescope_status_byte = skt.recv (maxlength) telescope_status_str = telescope_status_byte.decode ('utf-8') print (f'Current telescope status = {telescope_status_str}') ###########################################################################
server 側で、 test_socket_03_server.py を実行するでござる。
% python3.13 test_socket_03_server.py
client 側で、 test_socket_03_client.py を実行するでござる。
% python3.13 test_socket_03_client.py pointing 12.34 56.78 Reply from server: following command received: pointing 12.34 56.78
server 側では、コマンドを実行し始めるでござる。
% python3.13 test_socket_03_server.py Message received from client: pointing 12.34 56.78 Now, pointing telescope to the target...
server 側がコマンドを実行しているときに、 client 側でまたコマンドを実 行してみるでござる。
% python3.13 test_socket_03_client.py status Reply from server: following command received: status Current telescope status = status: busy (pointing target object)
server 側では、 status コマンドと pointing コマンドの実行が終わったこ とが表示されるでござる。
% python3.13 test_socket_03_server.py Message received from client: pointing 12.34 56.78 Now, pointing telescope to the target... Message received from client: status Now, checking telescope status Finished checking telescope status! Finished pointing telescope to the target!
また、 client 側でコマンドを実行してみるでござる。
% python3.13 test_socket_03_client.py status Reply from server: following command received: status Current telescope status = status: idling
server 側の様子は以下の通りでござる。
% python3.13 test_socket_03_server.py Message received from client: pointing 12.34 56.78 Now, pointing telescope to the target... Message received from client: status Now, checking telescope status Finished checking telescope status! Finished pointing telescope to the target! Message received from client: status Now, checking telescope status Finished checking telescope status!
| server 側でプログラムを実行したところ |
|---|
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| client 側でコマンドを実行したところ |
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| server 側でコマンドの実行が始まったところ |
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| server 側でコマンドが実行中に client 側でまたコマンドを実行 |
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| server 側では pointing コマンドの実行中に並行して status コマンドが処理される |
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| status コマンドに続いて pointing コマンドの実行が終了 |
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| client 側からもう一度コマンドを実行 |
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| server 側の様子 |
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実際に使えるものを作るためには、考えなければいけないことがまだまだあり そうでござる。コマンドによっては、何かのコマンドの実行中には、実行の開 始を待たねばならぬものがありそうでござる。また、接続を受け付ける相手を 制限することも必要そうでござる。通信内容が関係のない人に見えないように する必要もありそうでござる。標準的な手法がどこかで解説されていないか調 べてみようとおもうでござる。