OctoPrint-MeatPack: OctoPrint unable to connect to printer when plug-in is enabled

I have an Ender 3 Pro with SKR BTT Mini E3 v1.2, OctoPi v0.18 (RPi-4) fully up to date, MeatPack plug-in v 1.5.21. My fork of Marlin can be found here https://github.com/Taomyn/Marlin

Compiled latest bugfix as I found tonight including enabling MeatPack.

When enabled OctoPrint will not connect to the printer, disable it and OctoPrint is working fine. Some log data below, let me know if I can provide anything else.

Excerpt from OctoPrint log:

2021-01-28 20:03:25,462 - octoprint.util.comm - INFO - Changing monitoring state from "Offline" to "Detecting serial connection"
2021-01-28 20:03:25,482 - octoprint.util.comm - INFO - Serial detection: Performing autodetection with 2 port/baudrate candidates: /dev/ttyACM0@250000, /dev/ttyS0@250000
2021-01-28 20:03:25,482 - octoprint.util.comm - INFO - Serial detection: Trying port /dev/ttyACM0, baudrate 250000
2021-01-28 20:03:25,483 - octoprint.plugins.meatpack - INFO - [Serial]: Cannot query packing state -- port not open.
2021-01-28 20:03:25,484 - octoprint.plugins.meatpack - INFO - [Serial]: Cannot query packing state -- port not open.
2021-01-28 20:03:25,507 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #1 with timeout 2.0s
2021-01-28 20:03:25,511 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2021-01-28 20:03:27,721 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #2 with timeout 2.0s
2021-01-28 20:03:27,726 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2021-01-28 20:03:29,753 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #3 with timeout 2.0s
2021-01-28 20:03:29,757 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2021-01-28 20:03:32,753 - octoprint.util.comm - INFO - Serial detection: Trying port /dev/ttyS0, baudrate 250000
2021-01-28 20:03:32,763 - octoprint.util.comm - ERROR - Unexpected error while connecting to serial port /dev/ttyS0, baudrate 250000 from hook meatpack: SerialException: 'Could not configure port: (5, 'Input/output error')' @ comm.py:_open_serial:3670
Traceback (most recent call last):
  File "/home/pi/oprint/lib/python3.7/site-packages/serial/serialposix.py", line 398, in _reconfigure_port
    orig_attr = termios.tcgetattr(self.fd)
termios.error: (5, 'Input/output error')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/pi/oprint/lib/python3.7/site-packages/octoprint/util/comm.py", line 3670, in _open_serial
    settings().getFloat(["serial", "timeout", "connection"]),
  File "/home/pi/oprint/lib/python3.7/site-packages/octoprint/util/__init__.py", line 1890, in wrapper
    return f(*args, **kwargs)
  File "/home/pi/oprint/lib/python3.7/site-packages/OctoPrint_MeatPack/__init__.py", line 52, in serial_factory_hook
    self._serial_obj.port = str(port)
  File "/home/pi/oprint/lib/python3.7/site-packages/serial/serialutil.py", line 276, in port
    self.open()
  File "/home/pi/oprint/lib/python3.7/site-packages/serial/serialposix.py", line 332, in open
    self._reconfigure_port(force_update=True)
  File "/home/pi/oprint/lib/python3.7/site-packages/serial/serialposix.py", line 401, in _reconfigure_port
    raise SerialException("Could not configure port: {}".format(msg))
serial.serialutil.SerialException: Could not configure port: (5, 'Input/output error')
2021-01-28 20:03:32,802 - octoprint.util.comm - INFO - Serial detection: Could not open port /dev/ttyS0, baudrate 250000, skipping
2021-01-28 20:03:32,802 - octoprint.util.comm - INFO - Changing monitoring state from "Detecting serial connection" to "Error: No more candidates to test, and no working port/baudrate combination detected."
2021-01-28 20:03:32,804 - octoprint.util.comm - INFO - Changing monitoring state from "Error: No more candidates to test, and no working port/baudrate combination detected." to "Offline (Error: No more candidates to test, and no working port/baudrate combination detected.)"
2021-01-28 20:03:32,811 - octoprint.plugins.printoid - INFO - //// Send alert to Printoid: 'printer-error' with value Error: No more candidates to test, and no working port/baudrate combination detected. (mydomain)
2021-01-28 20:03:33,180 - octoprint.plugins.printoid - INFO - //// Send alert to Printoid: 'printer-error' with value Error: No more candidates to test, and no working port/baudrate combination detected. (mydomain)

Serial.log - failing

2021-01-28 20:02:47,456 - serial.log is currently not enabled, you can enable it via Settings > Serial Connection > Log communication to serial.log
2021-01-28 20:03:25,445 - serial.log is currently not enabled, you can enable it via Settings > Serial Connection > Log communication to serial.log
2021-01-28 20:08:08,102 - serial.log is currently not enabled, you can enable it via Settings > Serial Connection > Log communication to serial.log
2021-01-28 20:10:42,155 - Enabling serial logging
2021-01-28 20:10:52,495 - Changing monitoring state from "Offline" to "Detecting serial connection"
2021-01-28 20:10:52,531 - Performing autodetection with 2 port/baudrate candidates: /dev/ttyACM0@250000, /dev/ttyS0@250000
2021-01-28 20:10:52,531 - Trying port /dev/ttyACM0, baudrate 250000
2021-01-28 20:10:52,549 - Handshake attempt #1 with timeout 2.0s
2021-01-28 20:10:52,552 - Connected to: PackingSerial<id=0xa8c07a70, open=True>(port='/dev/ttyACM0', baudrate=250000, bytesize=8, parity='N', stopbits=1, timeout=2.0, xonxoff=False, rtscts=False, dsrdtr=False), starting monitor
2021-01-28 20:10:52,554 - Send: N0 M110 N0*125
2021-01-28 20:10:53,141 - Recv: Not SD printing
2021-01-28 20:10:54,132 - Recv:  T:21.87 /0.00 B:34.17 /0.00 @:0 B@:0
2021-01-28 20:10:54,142 - Recv: Not SD printing
2021-01-28 20:10:55,143 - Recv: Not SD printing
2021-01-28 20:10:55,144 - Handshake attempt #2 with timeout 2.0s
2021-01-28 20:10:55,157 - Send: N0 M110 N0*125
2021-01-28 20:10:56,131 - Recv:  T:20.94 /0.00 B:34.17 /0.00 @:0 B@:0
2021-01-28 20:10:56,142 - Recv: Not SD printing
2021-01-28 20:10:57,142 - Recv: Not SD printing
2021-01-28 20:10:58,131 - Recv:  T:21.25 /0.00 B:34.14 /0.00 @:0 B@:0
2021-01-28 20:10:58,139 - Handshake attempt #3 with timeout 2.0s
2021-01-28 20:10:58,147 - Send: N0 M110 N0*125
2021-01-28 20:10:58,150 - Recv: Not SD printing
2021-01-28 20:10:59,143 - Recv: Not SD printing
2021-01-28 20:11:00,131 - Recv:  T:21.41 /0.00 B:34.17 /0.00 @:0 B@:0
2021-01-28 20:11:00,143 - Recv: Not SD printing
2021-01-28 20:11:00,145 - Trying port /dev/ttyS0, baudrate 250000
2021-01-28 20:11:00,156 - Unexpected error while connecting to serial port /dev/ttyS0, baudrate 250000 from hook meatpack: SerialException: 'Could not configure port: (5, 'Input/output error')' @ comm.py:_open_serial:3670
2021-01-28 20:11:00,192 - Could not open port /dev/ttyS0, baudrate 250000, skipping
2021-01-28 20:11:00,193 - Changing monitoring state from "Detecting serial connection" to "Error: No more candidates to test, and no working port/baudrate combination detected."
2021-01-28 20:11:00,194 - Changing monitoring state from "Error: No more candidates to test, and no working port/baudrate combination detected." to "Offline (Error: No more candidates to test, and no working port/baudrate combination detected.)"
2021-01-28 20:11:00,195 - Connection closed, closing down monitor
2021-01-28 20:11:07,075 - Disabling serial logging

Serial.log - working

2021-01-28 20:22:37,140 - Changing monitoring state from "Offline" to "Detecting serial connection"
2021-01-28 20:22:37,760 - Performing autodetection with 2 port/baudrate candidates: /dev/ttyACM0@250000, /dev/ttyS0@250000
2021-01-28 20:22:37,761 - Trying port /dev/ttyACM0, baudrate 250000
2021-01-28 20:22:37,762 - Connecting to port /dev/ttyACM0, baudrate 250000
2021-01-28 20:22:37,868 - Handshake attempt #1 with timeout 2.0s
2021-01-28 20:22:37,893 - Connected to: Serial<id=0xa8b76910, open=True>(port='/dev/ttyACM0', baudrate=250000, bytesize=8, parity='N', stopbits=1, timeout=2.0, xonxoff=False, rtscts=False, dsrdtr=False), starting monitor
2021-01-28 20:22:37,895 - Send: N0 M110 N0*125
2021-01-28 20:22:37,931 - Recv: ok WNÂ…0g P31 B31
2021-01-28 20:22:37,978 - Changing monitoring state from "Detecting serial connection" to "Operational"
2021-01-28 20:22:38,036 - Send: N0 M110 N0*125
2021-01-28 20:22:38,116 - Recv: ok WNÂ…0g P31 B31
2021-01-28 20:22:38,118 - Send: N1 M115*39
2021-01-28 20:22:38,155 - Recv: FIRMWARE_NAME:Marlin v2.0.x (Jan 28 2021 19:53:47) SOURCE_CODE_URL:github.com/MarlinFirmware/Marlin PROTOCOL_VERSION:1.0 MACHINE_TYPE:Ender-3 Pro EXTRUDER_COUNT:1 UUID:

About this issue

  • Original URL
  • State: open
  • Created 3 years ago
  • Comments: 92 (16 by maintainers)

Most upvoted comments

I’m on an Ender-3 using Marlin Bugfix 2.0.9.1 on a BTT SKR E3 Mini V2 with OctoPrint 1.6.1. I was having similar issues where I could connect to the printer, but couldn’t transmit anything via octoprint if the meatpack plugin was enabled (even if i told it not to compress in the plugin options). I followed the Meatpack install instructions but it wasn’t working. I skimmed through some of the responses here and then updated my Configuration_adv.h file from

#define MEATPACK_ON_SERIAL_PORT_1       // 680 bytes
//#define MEATPACK_ON_SERIAL_PORT_2

to

//#define MEATPACK_ON_SERIAL_PORT_1       // 680 bytes
#define MEATPACK_ON_SERIAL_PORT_2

and this fixed it! I’m not an expert on any of this stuff, but if anyone else is running into the same situation with a similar setup, try this first since it’s an easy change.

+1
RadicalxEdward on Jul 16, 2021

With CDC serial (the “USB serial comm port emulation”), the UART speed is completely ignored, since UART’s data does not flow with 2 wires and strict clocking, it’s captured and send as bytes in USB packets (at native USB speed, 12MBits 480 MBits whatever). So you were probably doing < 12Mbits serial without even knowing it.

Can you describe the issue a bit more ?

  1. Without enabling Meatpack, do you get data from that USB’s serial link in a terminal/octoprint ?
  2. If yes, then Meatpack is probably doing something unexpected on the serial link (like, for example, trying to read 2 bytes while there’s only one available. On a usual serial port, it’ll just work with a single byte returned, but for USB, it’s waiting for the 2 bytes to come, so you don’t even get the former byte ?)
  3. If no, then it’s an issue with Marlin, and I need to figure out why it happens.
+1
X-Ryl669 on Feb 1, 2021

Hi having the same issue with Ender 3 V2 and standard E3 V2 BLTouch firmware from https://marlin.crc.id.au/ Using /dev/ttyUSB0

+1
ixendrax on Jan 31, 2021
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