What is the problem?
Just got Octoprint today and was so excited to NOT be kept awake by my printer all night since my PC is in my room.
Formatted SD and flashed OctoPi with correct settings, plugged in Pi, connected to the UI just fine.
Webcam is functional but Octoprint cannot connect to printer. When I set connection settings to "AUTO", it sends handshakes but gets no response from any Baudrate. When I tried at 115200 and selected the port, it sent a handshake but timed out and so closed the port.
What did you already try to solve it?
I tried unplugging the webcam, rebooted the system multiple times, restarted in safe mode multiple times, switched out the USB cord for a different cord, tried fiddling with the USB connection, re-flashed the SD card, and spent a good half-hour on this forum to no avail.
Have you tried running in safe mode?
yuh-huh.
Did running in safe mode solve the problem?
If it did, then why would I be writing a "get help" post?
Systeminfo Bundle
You can download this in OctoPrint's System Information dialog ... no bundle, no support!)
Changing monitoring state from "Offline" to "Detecting serial connection"
Performing autodetection with 7 port/baudrate candidates: /dev/ttyACM0@115200, /dev/ttyACM0@250000, /dev/ttyACM0@230400, /dev/ttyACM0@57600, /dev/ttyACM0@38400, /dev/ttyACM0@19200, /dev/ttyACM0@9600
Trying port /dev/ttyACM0, baudrate 115200
Connecting to port /dev/ttyACM0, baudrate 115200
Handshake attempt #1 with timeout 2.0s
Connected to: Serial<id=0xabb2b0b0, open=True>(port='/dev/ttyACM0', baudrate=115200, bytesize=8, parity='N', stopbits=1, timeout=2.0, xonxoff=False, rtscts=False, dsrdtr=False), starting monitor
Send: N0 M110 N0*125
Handshake attempt #2 with timeout 2.0s
Send: N0 M110 N0*125
Handshake attempt #3 with timeout 2.0s
Send: N0 M110 N0*125
Trying port /dev/ttyACM0, baudrate 250000
Handshake attempt #1 with timeout 2.0s
Send: N0 M110 N0*125
Handshake attempt #2 with timeout 2.0s
Send: N0 M110 N0*125
Handshake attempt #3 with timeout 2.0s
Send: N0 M110 N0*125
Trying port /dev/ttyACM0, baudrate 230400
Handshake attempt #1 with timeout 2.0s
Send: N0 M110 N0*125
Handshake attempt #2 with timeout 2.0s
Send: N0 M110 N0*125
Handshake attempt #3 with timeout 2.0s
Send: N0 M110 N0*125
Trying port /dev/ttyACM0, baudrate 57600
Handshake attempt #1 with timeout 2.0s
Send: N0 M110 N0*125
Handshake attempt #2 with timeout 2.0s
Send: N0 M110 N0*125
Handshake attempt #3 with timeout 2.0s
Send: N0 M110 N0*125
Trying port /dev/ttyACM0, baudrate 38400
Handshake attempt #1 with timeout 2.0s
Send: N0 M110 N0*125
Handshake attempt #2 with timeout 2.0s
Send: N0 M110 N0*125
Handshake attempt #3 with timeout 2.0s
Send: N0 M110 N0*125
Trying port /dev/ttyACM0, baudrate 19200
Handshake attempt #1 with timeout 2.0s
Send: N0 M110 N0*125
Handshake attempt #2 with timeout 2.0s
Send: N0 M110 N0*125
Handshake attempt #3 with timeout 2.0s
Send: N0 M110 N0*125
Trying port /dev/ttyACM0, baudrate 9600
Handshake attempt #1 with timeout 2.0s
Send: N0 M110 N0*125
Handshake attempt #2 with timeout 2.0s
Send: N0 M110 N0*125
Handshake attempt #3 with timeout 2.0s
Send: N0 M110 N0*125
Changing monitoring state from "Detecting serial connection" to "Error"
Changing monitoring state from "Error" to "Offline after error"
Connection closed, closing down monitor
Changing monitoring state from "Offline" to "Opening serial connection"
Connecting to port /dev/ttyACM0, baudrate 115200
Changing monitoring state from "Opening serial connection" to "Connecting"
Connected to: Serial<id=0xaba6e310, open=True>(port='/dev/ttyACM0', baudrate=115200, bytesize=8, parity='N', stopbits=1, timeout=10.0, xonxoff=False, rtscts=False, dsrdtr=False), starting monitor
Send: N0 M110 N0*125
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:3940
Please see https://faq.octoprint.org/serialerror for possible reasons of this.
Changing monitoring state from "Connecting" to "Offline after error"
Connection closed, closing down monitor
Changing monitoring state from "Offline" to "Detecting serial connection"
Performing autodetection with 1 port/baudrate candidates: /dev/ttyACM0@115200
Trying port /dev/ttyACM0, baudrate 115200
Connecting to port /dev/ttyACM0, baudrate 115200
Handshake attempt #1 with timeout 2.0s
Connected to: Serial<id=0xaba6ec10, open=True>(port='/dev/ttyACM0', baudrate=115200, bytesize=8, parity='N', stopbits=1, timeout=2.0, xonxoff=False, rtscts=False, dsrdtr=False), starting monitor
Send: N0 M110 N0*125
Handshake attempt #2 with timeout 2.0s
Send: N0 M110 N0*125
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:3940
Please see https://faq.octoprint.org/serialerror for possible reasons of this.
Changing monitoring state from "Detecting serial connection" to "Offline after error"
Connection closed, closing down monitor
Changing monitoring state from "Offline" to "Detecting serial connection"
Performing autodetection with 1 port/baudrate candidates: /dev/ttyACM0@115200
Trying port /dev/ttyACM0, baudrate 115200
Connecting to port /dev/ttyACM0, baudrate 115200
Handshake attempt #1 with timeout 2.0s
Connected to: Serial<id=0xab92d710, open=True>(port='/dev/ttyACM0', baudrate=115200, bytesize=8, parity='N', stopbits=1, timeout=2.0, xonxoff=False, rtscts=False, dsrdtr=False), starting monitor
Send: N0 M110 N0*125
Handshake attempt #2 with timeout 2.0s
Send: N0 M110 N0*125
Handshake attempt #3 with timeout 2.0s
Send: N0 M110 N0*125
Changing monitoring state from "Detecting serial connection" to "Error"
Changing monitoring state from "Error" to "Offline after error"
Connection closed, closing down monitor
Changing monitoring state from "Offline" to "Detecting serial connection"
Performing autodetection with 1 port/baudrate candidates: /dev/ttyACM0@115200
Trying port /dev/ttyACM0, baudrate 115200
Connecting to port /dev/ttyACM0, baudrate 115200
Handshake attempt #1 with timeout 2.0s
Connected to: Serial<id=0xab92d8b0, open=True>(port='/dev/ttyACM0', baudrate=115200, bytesize=8, parity='N', stopbits=1, timeout=2.0, xonxoff=False, rtscts=False, dsrdtr=False), starting monitor
Send: N0 M110 N0*125
Handshake attempt #2 with timeout 2.0s
Send: N0 M110 N0*125
Handshake attempt #3 with timeout 2.0s
Send: N0 M110 N0*125
Changing monitoring state from "Detecting serial connection" to "Error"
Changing monitoring state from "Error" to "Offline after error"
Connection closed, closing down monitor
Changing monitoring state from "Offline" to "Opening serial connection"
Connecting to port /dev/ttyACM0, baudrate 115200
Changing monitoring state from "Opening serial connection" to "Connecting"
Connected to: Serial<id=0xab8a9710, open=True>(port='/dev/ttyACM0', baudrate=115200, bytesize=8, parity='N', stopbits=1, timeout=10.0, xonxoff=False, rtscts=False, dsrdtr=False), starting monitor
Send: N0 M110 N0*125
Connection closed, closing down monitor
Changing monitoring state from "Connecting" to "Offline"
Additional information about your setup
OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible
Working on a Pi 3 B+ and flashed the 64 GB SD on Win 10, Octoprint 1.7.2, OctoPi 0.18.0
