[RRF3.11-3.2b3][DUET2WIFI] DWC constantly disconnects/reconnects

  • Good afternoon all,
    I recently purchased a Duet 2 WiFi board and configured it to control my Ender 3 Pro. Everything was working fine with the board but after a couple of days I started getting a lot of connection resets when trying to upload gcode to the board over WiFi, to the point where I would need to try each upload 10+ times before the file would upload successfully.

    Browsing these forums and looking at the WiFi troubleshooting guide, I checked my RSSI and found it was at -68 which is obviously not great. To remedy this I moved the printer much closer to my access point and was able to get the RSSI up to about -35, but the connectivity issues have not gone away.

    The following day, the web interface became basically inaccessible, disconnecting and reconnecting constantly (sometimes as frequently as 4x in one minute). The disconnect errors are either:

    Connection interrupted, attempting to reconnect...
    Network error
    # Note: This is the most common error


    Connection interrupted, attempting to reconnect...
    Cannot read property 'seqs' of undefined
    # Note: This particular error may have only started appearing after upgrading to 3.2b2 as a troubleshooting step

    I suspect this may be a hardware problem due to the fact that the signal strength is so good and the wifi "experience" is above 90% in UniFi, however I did try some additional troubleshooting steps based on reading through similar threads on these forums.

    • Configured a new, 2.4ghz-only SSID
    • Experimented with different channels (1, 3, 4, 6, 11)
    • Experimented with 20mhz and 40mhz channel bandwidth
    • Experimented with higher and lower AP broadcast power

    I also tried the following additional troubleshooting steps on the device itself:

    • Cleared the list of remembered networks and rejoined
    • Cleared the SD card and rebuilt a new card using the configurator
    • Reloaded firmware for the Duet board, the wifi server and DWC
    • Upgraded to RRF 3.2b3 with updated wifi server and DWC (this is where the board is now)

    The issue persists after all of these steps. At this point I am starting to think that the wifi module itself may be defective but I am hopeful that someone here has some experience that could help.

  • Moderator

    @penmoid said in [RRF3.11-3.2b3][DUET2WIFI] DWC constantly disconnects/reconnects:

    Can you share the results of M122?

    Does the light on the wifi module go out when there are disconnects?

    @penmoid said in [RRF3.11-3.2b3][DUET2WIFI] DWC constantly disconnects/reconnects:

    Cannot read property 'seqs' of undefined

    This may be a more informative error message from the newer wifi server version 1.24 that would have come with the 3.2b3 update. @dc42 might have a better idea what it means.

  • Thanks for the quick reply!

    Here's the output of M122:

    === Diagnostics ===
    RepRapFirmware for Duet 2 WiFi/Ethernet version 3.2-beta3 running on Duet WiFi 1.02 or later
    Board ID: 08DJM-9178L-L2MSD-6JTDA-3SD6Q-KSDAN
    Used output buffers: 3 of 24 (24 max)
    === RTOS ===
    Static ram: 23996
    Dynamic ram: 100472 of which 60 recycled
    Never used RAM 5520, free system stack 118 words
    Tasks: NETWORK(ready,183) HEAT(blocked,308) MAIN(running,448) IDLE(ready,19)
    Owned mutexes: WiFi(NETWORK)
    === Platform ===
    Last reset 02:39:46 ago, cause: software
    Last software reset at 2020-11-11 12:12, reason: User, GCodes spinning, available RAM 5520, slot 2
    Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0041f000 BFAR 0xe000ed38 SP 0xffffffff Task MAIN
    Error status: 0x04
    MCU temperature: min 29.0, current 31.1, max 31.4
    Supply voltage: min 24.0, current 24.2, max 24.5, under voltage events: 0, over voltage events: 0, power good: yes
    Driver 0: position 13880, standstill, SG min/max 0/189
    Driver 1: position 10280, standstill, SG min/max 0/161
    Driver 2: position 2400, standstill, SG min/max not available
    Driver 3: position 0, standstill, SG min/max not available
    Driver 4: position 0, standstill, SG min/max not available
    Driver 5: position 0
    Driver 6: position 0
    Driver 7: position 0
    Driver 8: position 0
    Driver 9: position 0
    Driver 10: position 0
    Driver 11: position 0
    Date/time: 2020-11-11 14:52:09
    Cache data hit count 4294967295
    Slowest loop: 13.70ms; fastest: 0.17ms
    I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
    === Storage ===
    Free file entries: 10
    SD card 0 detected, interface speed: 20.0MBytes/sec
    SD card longest read time 4.0ms, write time 4.1ms, max retries 0
    === Move ===
    Hiccups: 0(0), FreeDm: 169, MinFreeDm: 167, MaxWait: 6796914ms
    Bed compensation in use: none, comp offset 0.000
    === MainDDARing ===
    Scheduled moves 7, completed moves 7, StepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
    === AuxDDARing ===
    Scheduled moves 0, completed moves 0, StepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
    === Heat ===
    Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1 -1 -1
    === GCodes ===
    Segments left: 0
    Movement lock held by null
    HTTP is idle in state(s) 0
    Telnet is idle in state(s) 0
    File is idle in state(s) 0
    USB is idle in state(s) 0
    Aux is idle in state(s) 0
    Trigger is idle in state(s) 0
    Queue is idle in state(s) 0
    LCD is idle in state(s) 0
    Daemon is idle in state(s) 0
    Autopause is idle in state(s) 0
    Code queue is empty.
    === Network ===
    Slowest loop: 49.95ms; fastest: 0.00ms
    Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0), 0 sessions
    HTTP sessions: 1 of 8
    - WiFi -
    Network state is active
    WiFi module is connected to access point 
    Failed messages: pending 0, notready 0, noresp 0
    WiFi firmware version 1.24
    WiFi MAC address 84:0d:8e:ad:74:93
    WiFi Vcc 3.44, reset reason Turned on by main processor
    WiFi flash size 4194304, free heap 23200
    WiFi IP address
    WiFi signal strength -47dBm, reconnections 0, sleep mode modem
    Clock register 00002002
    Socket states: 0 0 0 0 0 0 0 0

    The light does not turn off, and I don't see any messages in the console on the PanelDue that indicate that wifi disconnected.

  • administrators

    Another possibility is that there is an IP address conflict between the Duet and something else.

  • That's a great suggestion and something that I had not checked. I looked through my AP and firewall logs and have not seen anything else using that IP.

    I also confirmed that there are no ICMP responses on that IP when the Duet board is powered off, so I think the answer to that question is No.

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