What is the problem?
Octoprint keeps disconnecting from the printer. I've never had a problem until today. "Unexpected error while reading serial port, please consult octoprint.log for details: SerialException: 'device reports readiness to read but returned no data (device disconnected or multiple access on port?)' @ comm.py:_readline:2823"
What did you already try to solve it?
Checked for updates, none.
Used a new USB cable.
Replace the power supply.
Logs (octoprint.log, serial.log or output on terminal tab at a minimum, browser error console if UI issue ... no logs, no support!)
system:
| Action Command Prompt Support (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/action_command_prompt
| Announcement Plugin (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/announcements
| Anonymous Usage Tracking (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/tracking
| Application Keys Plugin (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/appkeys
| AstroPrint (1.5.3) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_astroprint
| Automatic Shutdown (0.1.4) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_automaticshutdown
| Backup & Restore (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/backup
| Bed Visualizer (0.1.13) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_bedlevelvisualizer
| Cancel Objects (0.4.1) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_cancelobject
| Core Wizard (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/corewizard
| Dashboard (1.11.4) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_dashboard
| Discovery (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/discovery
| DisplayLayerProgress Plugin (1.20.0) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_DisplayLayerProgress
| Error Tracking (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/errortracking
| Exclude Region (0.2.0) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_excluderegion
| GcodeEditor (0.2.8) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_GcodeEditor
| Logging (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/logging
| Login UI (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/loginui
| Navbar Temperature Plugin (0.13) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_navbartemp
| Pi Support Plugin (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/pi_support
| Plugin Manager (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/pluginmanager
| Printer Safety Check (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/printer_safety_check
| PrintTimeGenius Plugin (2.2.1) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_PrintTimeGenius
| Remove /dev/ttyS* ports (0.1.0) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_remove_ttys_ports
| Simple Emergency Stop (1.0.1) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_simpleemergencystop
| Software Update (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/softwareupdate
| Themeify (1.2.2) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_themeify
| Virtual Printer (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/virtual_printer
Prefix legend: ! = disabled, # = blacklisted, * = incompatible
2020-04-21 03:19:37,194 - octoprint.environment - INFO - Detected environment is Python 2.7.16 under Linux (linux2). Details:
| hardware:
| cores: 4
| freq: 1500.0
| ram: 1979613184
| os:
| id: linux
| platform: linux2
| plugins:
| pi_support:
| model: Raspberry Pi 4 Model B Rev 1.1
| octopi_version: 0.17.0
| python:
| pip: 20.0.2
| version: 2.7.16
| virtualenv: /home/pi/oprint
2020-04-21 03:19:37,204 - octoprint.server - INFO - Reset webasset folder /home/pi/.octoprint/generated/webassets...
2020-04-21 03:19:37,224 - octoprint.server - INFO - Reset webasset folder /home/pi/.octoprint/generated/.webassets-cache...
2020-04-21 03:19:37,876 - octoprint.server - INFO - Shutting down intermediary server...
2020-04-21 03:19:37,927 - octoprint.server - INFO - Intermediary server shut down
2020-04-21 03:19:37,929 - octoprint.events - INFO - Processing startup event, this is our first event
2020-04-21 03:19:37,931 - octoprint.events - INFO - Adding 1 events to queue that were held back before startup event
2020-04-21 03:19:37,934 - octoprint.server - INFO - Autoconnect on startup is configured, trying to connect to the printer...
2020-04-21 03:19:37,934 - octoprint.filemanager - INFO - Adding backlog items from all storage types to analysis queue...
2020-04-21 03:19:37,973 - octoprint.plugins.pluginmanager - INFO - Loaded plugin repository data from disk, was still valid
2020-04-21 03:19:38,302 - octoprint.filemanager - INFO - Added 0 items from storage type "local" to analysis queue
2020-04-21 03:19:38,608 - octoprint.plugins.pluginmanager - INFO - Loaded notice data from disk, was still valid
2020-04-21 03:19:38,645 - octoprint.server - INFO - Trying to connect to configured serial port None
2020-04-21 03:19:38,807 - octoprint.util.comm - INFO - Changing monitoring state from "Offline" to "Detecting serial port"
2020-04-21 03:19:38,926 - octoprint.server.util.watchdog - INFO - Running initial scan on watched folder...
2020-04-21 03:19:38,990 - octoprint.server.util.watchdog - INFO - ... initial scan done.
2020-04-21 03:19:39,008 - octoprint.plugins.discovery - INFO - Registered 'OctoPrint instance on octopi' for _http._tcp
2020-04-21 03:19:39,018 - octoprint.util.comm - INFO - Changing monitoring state from "Detecting serial port" to "Opening serial port"
2020-04-21 03:19:39,023 - octoprint.util.comm - INFO - Changing monitoring state from "Opening serial port" to "Connecting"
2020-04-21 03:19:39,022 - octoprint.plugins.discovery - INFO - Registered 'OctoPrint instance on octopi' for _octoprint._tcp
2020-04-21 03:19:39,034 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-04-21 03:19:39,043 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-04-21 03:19:39,047 - octoprint.plugins.discovery - INFO - Registered OctoPrint instance on octopi for SSDP
2020-04-21 03:19:39,056 - octoprint.util.comm - INFO - Changing monitoring state from "Connecting" to "Operational"
2020-04-21 03:19:39,145 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-04-21 03:19:39,161 - octoprint.util.comm - INFO - Printer reports firmware name "Marlin 2.0.5.3 (GitHub)"
2020-04-21 03:19:39,186 - octoprint.util.comm - INFO - Firmware states that it supports temperature autoreporting
2020-04-21 03:19:39,242 - octoprint.server - INFO - Listening on http://127.0.0.1:5000
2020-04-21 03:19:39,326 - octoprint.plugins.pluginmanager - INFO - Loaded plugin repository data from disk, was still valid
2020-04-21 03:19:39,371 - octoprint.server.util.sockjs - INFO - New connection from client: 2002:2f9c:9f0c:0:308a:ea7:25e1:c38b
2020-04-21 03:19:39,633 - octoprint.util.pip - INFO - Using "/home/pi/oprint/bin/python2 -m pip" as command to invoke pip
2020-04-21 03:19:39,791 - octoprint.util.pip - INFO - Using "/home/pi/oprint/bin/python2 -m pip" as command to invoke pip
2020-04-21 03:19:39,816 - octoprint.server.util.flask - INFO - Passively logging in user caseysimonmft from ::ffff:192.168.1.31
2020-04-21 03:19:39,829 - octoprint.access.users - INFO - Logged in user: caseysimonmft
2020-04-21 03:19:39,877 - octoprint.server.util.sockjs - INFO - User caseysimonmft logged in on the socket from client 2002:2f9c:9f0c:0:308a:ea7:25e1:c38b
2020-04-21 03:19:40,123 - octoprint.plugins.tracking - INFO - Sent tracking event printer_connected, payload: {u'printer_baudrate': 115200, u'printer_port': None, 'firmware_name': u'Marlin 2.0.5.3 (GitHub)'}
2020-04-21 03:19:40,164 - octoprint.util.pip - INFO - Using "/home/pi/oprint/bin/python2 -m pip" as command to invoke pip
2020-04-21 03:19:40,477 - octoprint.plugins.pluginmanager - INFO - Loaded notice data from disk, was still valid
2020-04-21 03:19:41,736 - octoprint.util.pip - INFO - pip installs to /home/pi/oprint/lib/python2.7/site-packages/ (writable -> yes), --user flag needed -> no, virtual env -> yes
2020-04-21 03:19:41,737 - octoprint.util.pip - INFO - ==> pip ok -> yes
2020-04-21 03:19:41,741 - octoprint.util.pip - INFO - pip installs to /home/pi/oprint/lib/python2.7/site-packages (writable -> yes), --user flag needed -> no, virtual env -> yes
2020-04-21 03:19:41,745 - octoprint.util.pip - INFO - ==> pip ok -> yes
2020-04-21 03:19:41,826 - octoprint.plugins.softwareupdate - INFO - Saved version cache to disk
2020-04-21 03:19:41,835 - octoprint.plugins.astroprint - INFO - No print files yaml: /home/pi/.octoprint/data/astroprint/print_files.yaml
2020-04-21 03:19:41,896 - octoprint.plugins.astroprint - INFO - No stored AstroPrint user
2020-04-21 03:19:41,898 - octoprint.plugins.bedlevelvisualizer - INFO - OctoPrint-BedLevelVisualizer loaded!
2020-04-21 03:19:41,899 - octoprint.plugins.dashboard - INFO - Dashboard started
2020-04-21 03:19:41,904 - octoprint.plugins.navbartemp - INFO - Broadcom detected
2020-04-21 03:19:41,905 - octoprint.plugins.themeify - INFO - Themeify initialized.
2020-04-21 03:19:42,104 - octoprint.server.preemptive_cache - INFO - Preemptively caching / (ui _default) for {'query_string': 'l10n=en', 'path': '/', 'base_url': 'http://octopi.local/'}
2020-04-21 03:19:42,587 - octoprint.plugins.tracking - INFO - Sent tracking event ping, payload: {'octoprint_uptime': 7}
2020-04-21 03:19:43,304 - octoprint.plugins.tracking - INFO - Sent tracking event startup, payload: {'python': '2.7.16', 'ram': 1979613184, u'octopi_version': u'0.17.0', 'version': u'1.4.0', 'pip': '20.0.2', 'cores': 4, 'freq': 1500.0, u'pi_model': u'Raspberry Pi 4 Model B Rev 1.1', 'os': 'linux'}
2020-04-21 03:19:44,159 - octoprint.plugins.tracking - INFO - Sent tracking event pong, payload: {'plugins': u'displaylayerprogress:1.20.0,gcodeeditor:0.2.8,cancelobject:0.4.1,astroprint:1.5.3,remove_ttys_ports:0.1.0,themeify:1.2.2,bedlevelvisualizer:0.1.13,automaticshutdown:0.1.4,simpleemergencystop:1.0.1,navbartemp:0.13,excluderegion:0.2.0,dashboard:1.11.4,printtimegenius:2.2.1'}
2020-04-21 03:19:48,680 - octoprint.server.preemptive_cache - INFO - ... done in 6.58s
2020-04-21 03:19:51,917 - octoprint.server.util.flask - INFO - Passively logging in user caseysimonmft from ::ffff:192.168.1.31
2020-04-21 03:19:51,919 - octoprint.access.users - INFO - Logged in user: caseysimonmft
2020-04-21 03:19:52,023 - octoprint.server.util.sockjs - INFO - Client connection closed: 2002:2f9c:9f0c:0:308a:ea7:25e1:c38b
2020-04-21 03:19:53,917 - octoprint.server.util.sockjs - INFO - New connection from client: 2002:2f9c:9f0c:0:308a:ea7:25e1:c38b
2020-04-21 03:19:54,035 - octoprint.server.util.flask - INFO - Passively logging in user caseysimonmft from ::ffff:192.168.1.31
2020-04-21 03:19:54,036 - octoprint.access.users - INFO - Logged in user: caseysimonmft
2020-04-21 03:19:55,549 - octoprint.server.util.sockjs - INFO - User caseysimonmft logged in on the socket from client 2002:2f9c:9f0c:0:308a:ea7:25e1:c38b
2020-04-21 03:21:14,138 - octoprint.util.comm - ERROR - Unexpected error while reading from serial port
Traceback (most recent call last):
File "/home/pi/oprint/local/lib/python2.7/site-packages/octoprint/util/comm.py", line 2823, in _readline
ret = self._serial.readline()
File "/home/pi/oprint/local/lib/python2.7/site-packages/octoprint/util/comm.py", line 4968, in readline
c = self.read(1)
File "/home/pi/oprint/local/lib/python2.7/site-packages/serial/serialposix.py", line 501, in read
'device reports readiness to read but returned no data '
SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2020-04-21 03:21:14,241 - octoprint.util.comm - ERROR - Please see https://faq.octoprint.org/serialerror for possible reasons of this.
2020-04-21 03:21:14,285 - octoprint.util.comm - INFO - Changing monitoring state from "Operational" to "Offline (Error: SerialException: 'device reports readiness to read but returned no data (device disconnected or multiple access on port?)' @ comm.py:_readline:2823)"
2020-04-21 03:21:29,867 - octoprint.util.comm - INFO - Changing monitoring state from "Offline" to "Detecting serial port"
2020-04-21 03:21:29,904 - octoprint.util.comm - INFO - Changing monitoring state from "Detecting serial port" to "Opening serial port"
2020-04-21 03:21:29,907 - octoprint.util.comm - INFO - Changing monitoring state from "Opening serial port" to "Connecting"
2020-04-21 03:21:29,939 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-04-21 03:21:44,858 - octoprint.util.comm - ERROR - Unexpected error while reading from serial port
Traceback (most recent call last):
File "/home/pi/oprint/local/lib/python2.7/site-packages/octoprint/util/comm.py", line 2823, in _readline
ret = self._serial.readline()
File "/home/pi/oprint/local/lib/python2.7/site-packages/octoprint/util/comm.py", line 4968, in readline
c = self.read(1)
File "/home/pi/oprint/local/lib/python2.7/site-packages/serial/serialposix.py", line 501, in read
'device reports readiness to read but returned no data '
SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2020-04-21 03:21:44,926 - octoprint.util.comm - ERROR - Please see https://faq.octoprint.org/serialerror for possible reasons of this.
2020-04-21 03:21:44,956 - octoprint.util.comm - INFO - Changing monitoring state from "Connecting" to "Offline (Error: SerialException: 'device reports readiness to read but returned no data (device disconnected or multiple access on port?)' @ comm.py:_readline:2823)"
Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible)
octopi_version: 0.17.0
Ender 3 pro using BTT SKR 1.2