====== OctoPrint Connection Fix Plugin ======

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<WRAP center round info 95%>
//Having trouble connecting to your printer with OctoPrint? \\
This may be a solution/workaround to your OctoPrint connection woes.//
</WRAP>

[[https://github.com/OctoPrint/OctoPrint-MalyanConnectionFix/blob/master/README.md|OctoPrint Connection Fix Plugin for Malyan M100 & M200, Monoprice MP Select Mini & MP Mini Delta, PrintFab3D ProFab Mini, PrimaCreator P120, SpiderMaker]]


<blockquote>
Minimal OctoPrint plugin that performs a double open on the serial port to potentially work around issues with Malyan printers. Put file into ~/.octoprint/plugins and restart the server. Based on https://github.com/foosel/OctoPrint/issues/2271#issuecomment-352662485
</blockquote>

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/*

<WRAP center round important 95%>
<wrap em>**Experimental**</wrap> \\
<wrap em>This plugin is still in testing.</wrap>
</WRAP>

<WRAP center round info 95%>
//Having trouble connecting to your printer with OctoPrint? \\
This may be a solution/workaround to your OctoPrint connection woes.//
</WRAP>


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===== Installation Instructions =====
https://github.com/foosel/OctoPrint/issues/2271#issuecomment-359500927


<blockquote>
foosel 
commented about 18 hours ago

So... [[https://gist.github.com/foosel/73dd83fc723fa164a8e2f88b5d8476e6|here's something to test with]].

It's a minimal plugin that changes the serial opening to what @ygator suggested. Note that a) it doesn't work at all on Windows based systems, b) it doesn't play nice with other printers (so I couldn't really test this) and c) I have absolutely no idea at all if this might actually help or not.

To test, on OctoPi, SSH into your machine, then:

<code>
cd ~/.octoprint/plugins
wget https://gist.githubusercontent.com/foosel/73dd83fc723fa164a8e2f88b5d8476e6/raw/dd58f5f6e423a00458b4754a0931e8bffa8ce415/serial_double_open.py
sudo service octoprint restart
</code>

Please report back. To uninstall/disable it again, it can be found as "Serial Double Open Plugin" in the Plugin Manager.
</blockquote>


----

[[https://gist.github.com/foosel/73dd83fc723fa164a8e2f88b5d8476e6|]]

<blockquote>
Minimal OctoPrint plugin that performs a double open on the serial port to potentially work around issues with Malyan printers. Put file into ~/.octoprint/plugins and restart the server. Based on https://github.com/foosel/OctoPrint/issues/2271#issuecomment-352662485
</blockquote>



<file py serial_double_open.py>
# coding=utf-8
from __future__ import absolute_import

import serial
import logging
import sys

import octoprint.plugin
from octoprint.events import Events, eventManager

def serial_factory(comm_instance, port, baudrate, read_timeout, *args, **kwargs):
    """
    This is basically the default serial factory, just with a weird open/open/close sequence applied
    Performs
        OPEN Parity.ODD
        OPEN Parity.NONE
        CLOSE Parity.ODD
        USE Parity.NONE
    
    See https://github.com/foosel/OctoPrint/issues/2271#issuecomment-352662485
    """
    if sys.platform == "win32":
        # Windows doesn't allow double open, log and bail
        logging.getLogger("octoprint.plugins.serial_double_open").error("Cannot run serial double open under windows")
        return None

    if port is None or port == 'AUTO':
        # no known port, try auto detection
        comm_instance._changeState(comm_instance.STATE_DETECT_SERIAL)

        port = comm_instance._detect_port()
        if port is None:
            comm_instance._errorValue = 'Failed to autodetect serial port, please set it manually.'
            comm_instance._changeState(comm_instance.STATE_ERROR)
            eventManager().fire(Events.ERROR, {"error": comm_instance.getErrorString()})
            comm_instance._log("Failed to autodetect serial port, please set it manually.")
            return None
    
    # connect to regular serial port
    comm_instance._log("Connecting to: %s" % port)
    if baudrate == 0:
        from octoprint.util.comm import baudrateList
        baudrates = baudrateList()
        baudrate = 115200 if 115200 in baudrates else baudrates[0]

    serial_obj1 = serial.Serial(str(port), baudrate, timeout=read_timeout, writeTimeout=10000,
                                parity=serial.PARITY_ODD)
    serial_obj2 = serial.Serial(str(port), baudrate, timeout=read_timeout, writeTimeout=10000,
                                parity=serial.PARITY_NONE)

    serial_obj1.close() # close the first instance, we don't actually need that
    return serial_obj2 # return the second instance

__plugin_name__ = "Serial Double Open Plugin"
__plugin_description__ = "Performs a double open on the serial port to potentially work around issues with Malyan printers"
__plugin_author__ = "Gina Häußge"
__plugin_homepage__ = "https://github.com/foosel/OctoPrint/issues/2271#issuecomment-352662485"
__plugin_hooks__ = {
    "octoprint.comm.transport.serial.factory": serial_factory
}
</file>

*/