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Dec 15, 2017  I am using python 2.7.2 with pyserial 2.6. What is the best way to use pyserial.readline when talking to a device that has a character other than 'n' for eol? The pyserial doc points out that py.

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#! /usr/bin/env python

#

# This file is part of pySerial - Cross platform serial port support for Python

# (C) 2010-2015 Chris Liechti <cliechti@gmx.net>

#

# SPDX-License-Identifier: BSD-3-Clause

''

Some tests for the serial module.

Part of pyserial (http://pyserial.sf.net) (C)2010 cliechti@gmx.net

Intended to be run on different platforms, to ensure portability of

the code.

For all these tests a simple hardware is required.

Loopback HW adapter:

Shortcut these pin pairs:

TX <-> RX

RTS <-> CTS

DTR <-> DSR

On a 9 pole DSUB these are the pins (2-3) (4-6) (7-8)

''

import unittest

import sys

import serial

#~ print serial.VERSION

# on which port should the tests be performed:

PORT='loop://'

if sys.version_info >= (3, 0):

defdata(string):

returnbytes(string, 'latin1')

else:

defdata(string):

return string

classTest_Readline(unittest.TestCase):

''Test readline function''

defsetUp(self):

self.s = serial.serial_for_url(PORT, timeout=1)

deftearDown(self):

self.s.close()

deftest_readline(self):

''Test readline method''

self.s.write(serial.to_bytes([0x31, 0x0a, 0x32, 0x0a, 0x33, 0x0a]))

self.assertEqual(self.s.readline(), serial.to_bytes([0x31, 0x0a]))

self.assertEqual(self.s.readline(), serial.to_bytes([0x32, 0x0a]))

self.assertEqual(self.s.readline(), serial.to_bytes([0x33, 0x0a]))

# this time we will get a timeout

self.assertEqual(self.s.readline(), serial.to_bytes([]))

deftest_readlines(self):

''Test readlines method''

self.s.write(serial.to_bytes([0x31, 0x0a, 0x32, 0x0a, 0x33, 0x0a]))

self.assertEqual(

self.s.readlines(),

[serial.to_bytes([0x31, 0x0a]), serial.to_bytes([0x32, 0x0a]), serial.to_bytes([0x33, 0x0a])]

)

deftest_xreadlines(self):

''Test xreadlines method (skipped for io based systems)''

ifhasattr(self.s, 'xreadlines'):

self.s.write(serial.to_bytes([0x31, 0x0a, 0x32, 0x0a, 0x33, 0x0a]))

self.assertEqual(

list(self.s.xreadlines()),

[serial.to_bytes([0x31, 0x0a]), serial.to_bytes([0x32, 0x0a]), serial.to_bytes([0x33, 0x0a])]

)

deftest_for_in(self):

''Test for line in s''

self.s.write(serial.to_bytes([0x31, 0x0a, 0x32, 0x0a, 0x33, 0x0a]))

lines = []

for line inself.s:

lines.append(line)

self.assertEqual(

lines,

[serial.to_bytes([0x31, 0x0a]), serial.to_bytes([0x32, 0x0a]), serial.to_bytes([0x33, 0x0a])]

)

deftest_alternate_eol(self):

''Test readline with alternative eol settings (skipped for io based systems)''

ifhasattr(self.s, 'xreadlines'): # test if it is our FileLike base class

self.s.write(serial.to_bytes('nornonyesrn'))

self.assertEqual(

self.s.readline(eol=serial.to_bytes('rn')),

serial.to_bytes('nornonyesrn'))

if__name__'__main__':

import sys

sys.stdout.write(__doc__)

iflen(sys.argv) >1:

PORT= sys.argv[1]

sys.stdout.write('Testing port: {!r}n'.format(PORT))

sys.argv[1:] = ['-v']

# When this module is executed from the command-line, it runs all its tests

unittest.main()

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Miniterm

Miniterm is now available as module instead of example.see :ref:`miniterm` for details.

miniterm.py

The miniterm program.

setup-miniterm-py2exe.py

This is a py2exe setup script for Windows. It can be used to create astandalone miniterm.exe.

TCP/IP - serial bridge

This program opens a TCP/IP port. When a connection is made to that port (e.g.with telnet) it forwards all data to the serial port and vice versa.

This example only exports a raw socket connection. The next examplebelow gives the client much more control over the remote serial port.

• The serial port settings are set on the command line when starting theprogram.
• There is no possibility to change settings from remote.
• All data is passed through as-is.

tcp_serial_redirect.py

Main program.

Single-port TCP/IP - serial bridge (RFC 2217)

Simple cross platform RFC 2217 serial port server. It uses threads and isportable (runs on POSIX, Windows, etc).

• The port settings and control lines (RTS/DTR) can be changed at any timeusing RFC 2217 requests. The status lines (DSR/CTS/RI/CD) are polled everysecond and notifications are sent to the client.
• Telnet character IAC (0xff) needs to be doubled in data stream. IAC followedby another value is interpreted as Telnet command sequence.
• Telnet negotiation commands are sent when connecting to the server.
• RTS/DTR are activated on client connect and deactivated on disconnect.
• Default port settings are set again when client disconnects.

rfc2217_server.py

Main program.

setup-rfc2217_server-py2exe.py

This is a py2exe setup script for Windows. It can be used to create astandalone rfc2217_server.exe.

Multi-port TCP/IP - serial bridge (RFC 2217)

This example implements a TCP/IP to serial port service that works withmultiple ports at once. It uses select, no threads, for the serial ports andthe network sockets and therefore runs on POSIX systems only.

• Full control over the serial port with RFC 2217.
• Check existence of /tty/USB0...8. This is done every 5 seconds usingos.path.exists.
• Send zeroconf announcements when port appears or disappears (usespython-avahi and dbus). Service name: _serial_port._tcp.
• Each serial port becomes available as one TCP/IP server. e.g./dev/ttyUSB0 is reachable at <host>:7000.
• Single process for all ports and sockets (not per port).
• The script can be started as daemon.
• Logging to stdout or when run as daemon to syslog.
• Default port settings are set again when client disconnects.
• modem status lines (CTS/DSR/RI/CD) are not polled periodically and the servertherefore does not send NOTIFY_MODEMSTATE on its own. However it responds torequest from the client (i.e. use the poll_modem option in the URL whenusing a pySerial client.)

Requirements:

• Python (>= 2.4)
• python-avahi
• python-dbus
• python-serial (>= 2.5)

Installation as daemon:

• Copy the script port_publisher.py to /usr/local/bin.
• Copy the script port_publisher.sh to /etc/init.d.
• Add links to the runlevels using update-rc.d port_publisher.sh defaults 99
• That's it :-) the service will be started on next reboot. Alternatively runinvoke-rc.d port_publisher.sh start as root.

port_publisher.py

Multi-port TCP/IP-serial converter (RFC 2217) for POSIX environments.

port_publisher.sh

Example init.d script.

wxPython examples

Python Pyserial Readline Example Pdf

A simple terminal application for wxPython and a flexible serial portconfiguration dialog are shown here.

Python Pyserial Readline Example Java

wxTerminal.py

A simple terminal application. Note that the length of the buffer islimited by wx and it may suddenly stop displaying new input.

wxTerminal.wxg

A wxGlade design file for the terminal application.

wxSerialConfigDialog.py

A flexible serial port configuration dialog.

wxSerialConfigDialog.wxg

The wxGlade design file for the configuration dialog.

setup-wxTerminal-py2exe.py

A py2exe setup script to package the terminal application.

Unit tests

The project uses a number of unit test to verify the functionality. They allneed a loop back connector. The scripts itself contain more information. Alltest scripts are contained in the directory test.

The unit tests are performed on port loop:// unless a different devicename or URL is given on the command line (sys.argv[1]). e.g. to run thetest on an attached USB-serial converter hwgrep://USB could be used orthe actual name such as /dev/ttyUSB0 or COM1 (depending on platform).

run_all_tests.py

Collect all tests from all test* files and run them. By default, theloop:// device is used.

test.py

Basic tests (binary capabilities, timeout, control lines).

test_advanced.py

Test more advanced features (properties).

test_high_load.py

Tests involving sending a lot of data.

test_readline.py

Tests involving readline.

test_iolib.py

Tests involving the :mod:`io` library. Only available for Python 2.6 andnewer.

test_url.py

Tests involving the :ref:`URL <URLs>` feature.