The YMODEM project is based on XMODEM implementation written by tehmaze. It is also compatible with XMODEM mode.

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Demo

Test the sending and receiving functions

If you want to run the test sample, please do the following:

1. use virtual serial port tool to generate COM1 and COM2 that can communicate
2. run the FileReceiver.py and FileSender.py on the command line

The specific transmission process is shown in the following figure:

Interact with SecureCRT

Interact with SecureCRT as sender

Interact with SecureCRT as Finder

Quick start

from Modem import Modem

'''
Sender
'''
# define read function for sender
def sender_read(size, timeout=3):
    pass

# define write function for sender
def sender_write(data, timeout=3):
    pass

# create sender
sender = Modem(sender_read, sender_write)

# send multi files
sender.send([file_path1, file_path2, file_path3 ...])

'''
Receiver
'''

# define read function for receiver
def receiver_read(size, timeout=3):
    pass

# define write function for receiver
def receiver_write(data, timeout=3):
    pass

# create receiver
receiver = Modem(receiver_read, receiver_write)

# receive multi files
receiver.recv(folder_path)

API

Create MODEM Object

def __init__(self, reader, writer, mode='ymodem1k', program="rzsz")

• reader, reader(object) or read(function)
• writer, writer(object) or write(function)
• mode, support xmodem, xmodem1k, ymodem, ymodem1k(by default)
• program, YMODEM of different program have different features

Send files

def send(self, file_paths, retry=10, timeout=10, callback=None)

• file_paths: file path list.

• retry: max retry count.

• timeout: timeout of reader or writer in second.

• callback: callback function. see below.

  Parameter	Description
  task index	index of current task
  task (file) name	name of the file
  total packets	number of packets plan to send
  success packets	number of packets successfully sent
  failed packets	number of packets failed to send

Receive files

def recv(self, folder_path, crc_mode=1, retry=10, timeout=10, delay=1, callback=None)

• folder_path: folder path for saving.

• crc_mode: checksum or crc mode.

• retry: max retry count.

• timeout: timeout of reader or writer in second.

• delay: delay in second.

• callback: callback function. see below.

  Parameter	Description
  task index	index of current task
  task (file) name	name of the file
  total packets	number of packets plan to send
  success packets	number of packets successfully sent
  failed packets	number of packets failed to send

Debug

If you want to output debugging information, set the log level to DEBUG.

logging.basicConfig(level=logging.DEBUG, format='%(message)s')

Changelog

v1.3 (2022/11/21 14:00 +00:00)

• Support batch transmission
• Simplify the API

License

MIT License