Python Pexpect 和 Minicom 无法按预期工作

Question

I need to perform a number of processes to Switch that I can only execute through serial port. To do this I use Pexpect and Minicom. I am able to execute the command child.sendcontrol(“c”) to open the menu. But from the menu I can't choose any of the options.

When I do this manually through the Minicom it works without a problem. what could be the problem?

Note I use child.after to verify that the actions were actually performed.

This is my code:

#!/usr/bin/python3

import pexpect

print("Waiting for connection....") # for check
child = pexpect.spawn("minicom")
child.expect(r".*Hit.*", timeout=120)
test = child.after
fileNameone = "/root/Desktop/fileone.txt"
file = open(fileNameone, "wb")
file.write(test)
file.close

child.sendcontrol("c")
print("menu") # for check

child.expect(".*selection.*", timeout=10)
testtwo = child.after
fileNametwo = "/root/Desktop/filetwo.txt"
file = open(fileNametwo, "wb")
file.write(testtwo)
file.close
child.sendline("1")
print("choose 1") # for check


child.expect(".*Gateway.*", timeout=40)
child.sendline("admin")
child.expect(".*Password.*", timeout=10)
child.sendline("admin")
print("connect!") # for check

This is the request to press ctrl + c to open the menu (The log was taken from pexpect through minicom):

[23;80H [24;1H************ Hit 'Ctrl + C' for boot menu ************
[23;80H [24;1H
[23;80H [24;1H 2 

This is the menu (The log was taken from pexpect through minicom):

[23;80H [24;1HWelcome to Embedded Boot Menu :
[23;80H [24;1H
[23;80H [24;1H[24;9H1. Start in normal Mode
[23;80H [24;1H[24;9H2. Start in debug Mode
[23;80H [24;1H[24;9H3. Start in maintenance Mode
[23;80H [24;1H[24;9H4. Restore to Factory Defaults (local)
[23;80H [24;1H[24;9H5. Install/Update Image from Network
[23;80H [24;1H[24;9H6. Restart Boot-Loader
[23;80H [24;1H[24;9H7. Run Hardware diagnostics
[23;80H [24;1H[24;9H8. Upload preset configuration file
[23;80H [24;1H[24;9H9. Delete preset configuration file
[23;80H [24;1H
[23;80H [24;1H[24;9HPlease enter your selection (pres

I'm trying to choose option 1, for the test. But it is not performed. The same goes for each menu option.

child.expect(".*selection.*", timeout=10)
child.sendline("1")

This is the error: (Should not take more than 15 seconds to boot)

Traceback (most recent call last):
  File "./test.py", line 33, in <module>
    child.expect(".*Gateway.*", timeout=40)
  File "/usr/local/lib/python3.6/site-packages/pexpect/spawnbase.py", line 344, in expect
    timeout, searchwindowsize, async_)
  File "/usr/local/lib/python3.6/site-packages/pexpect/spawnbase.py", line 372, in expect_list
    return exp.expect_loop(timeout)
  File "/usr/local/lib/python3.6/site-packages/pexpect/expect.py", line 181, in expect_loop
    return self.timeout(e)
  File "/usr/local/lib/python3.6/site-packages/pexpect/expect.py", line 144, in timeout
    raise exc
pexpect.exceptions.TIMEOUT: Timeout exceeded.
<pexpect.pty_spawn.spawn object at 0x7fefa0934a90>
command: /usr/bin/minicom
args: ['/usr/bin/minicom']
buffer (last 100 chars): b's ENTER to finish) :1\r\n\x1b[23;80H \x1b[24;1H'
before (last 100 chars): b's ENTER to finish) :1\r\n\x1b[23;80H \x1b[24;1H'
after: <class 'pexpect.exceptions.TIMEOUT'>
match: None
match_index: None
exitstatus: None
flag_eof: False
pid: 10862
child_fd: 5
closed: False
timeout: 30
delimiter: <class 'pexpect.exceptions.EOF'>
logfile: None
logfile_read: None
logfile_send: None
maxread: 2000
ignorecase: False
searchwindowsize: None
delaybeforesend: 0.05
delayafterclose: 0.1
delayafterterminate: 0.1
searcher: searcher_re:
    0: re.compile(b'.*Gateway.*')

Answer 1

I was able to solve the problem, minicom must get manual enter. Even that child.sendline sends with Enter. For some reason the minicom doesn't get the enter. Child.send ("\r\n") doesn't work either.

The solution is:

After the line child.sendline("1")

I added the line child.sendcontrol("m") for press enter.

Now it works properly.