Communication Error, Firmware 1.9

c310

I have the same error

[[language]]
Communication Error
An AJAX error has been reported, so the current session has been terminated.
Please check if your printer is still on and try to connect again.
Error reason: timeout

it happens even on idle. pressing connect on web interface connects back, but this does not reconnect after Emergency Stop button pressed. power off required.

i think it is either WiFi frimware or web server.
i increased timeouts and retry in web interface , but it did not help.

please advise

dc42

Are you running 1.19 firmware? If so, please run M122 when you are connected and report the WiFi statistics, in particular the RSSI.

Willy510

Mine drops all of the time now after 1.19 , any solution for this
M122
=== Diagnostics ===
Used output buffers: 3 of 32 (18 max)
=== Platform ===
RepRapFirmware for Duet WiFi version 1.19 running on Duet WiFi 1.0
Board ID: 08DAM-9K9K2-NGNSN-6J9D8-3SJ6S-14U3M
Static ram used: 21176
Dynamic ram used: 96128
Recycled dynamic ram: 1480
Stack ram used: 1304 current, 5836 maximum
Never used ram: 6452
Last reset 00:48:07 ago, cause: software
Last software reset reason: User, spinning module GCodes, available RAM 3224 bytes (slot 1)
Software reset code 0x0003, HFSR 0x00000000, CFSR 0x00000000, ICSR 0x00400000, BFAR 0xe000ed38, SP 0xffffffff
Error status: 0
Free file entries: 10
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest block write time: 19.5ms
MCU temperature: min 50.1, current 50.5, max 55.1
Supply voltage: min 24.4, current 24.5, max 24.9, under voltage events: 0, over voltage events: 0
Driver 0: stalled standstill
Driver 1: stalled standstill
Driver 2: stalled standstill
Driver 3: standstill
Driver 4: standstill
Date/time: 2017-08-25 20:39:30
Slowest main loop (seconds): 0.068481; fastest: 0.000000
=== Move ===
MaxReps: 0, StepErrors: 0, FreeDm: 240, MinFreeDm 240, MaxWait: 0ms, Underruns: 0, 0
Scheduled moves: 7, completed moves: 7
Bed compensation in use: none
Bed probe heights: 0.000 0.000 0.000 0.000 0.000
=== Heat ===
Bed heater = 0, chamber heater = -1
Heater 1 is on, I-accum = 0.3
=== GCodes ===
Segments left: 0
Stack records: 2 allocated, 0 in use
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
serial is idle in state(s) 0
aux is idle in state(s) 0
daemon is idle in state(s) 0
queue is idle in state(s) 0
autopause is idle in state(s) 0
Code queue is empty.
Network state is running
WiFi module is connected to access point
WiFi firmware version 1.19
WiFi MAC address 5c:cf:7f:f8:1f:6b
WiFi Vcc 3.05, reset reason Turned on by main processor
WiFi flash size 4194304, free heap 37752
WiFi IP address 10.0.0.50
WiFi signal strength -76dBm
HTTP sessions: 1 of 8
Socket states: 0 2 0 0 0 0 0 0
Responder states: HTTP(1) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0)

dc42

Your WiFi signal strength is only -76dBm, which is to low to give a reliable connection. Changing the WiFi channel on your router may help.

c310

here is my M122 too. signal is -76
however nothing changed in setup but firmware. with previous version connection NEVER failed…

is there any way to tweak WiFi module?

perhaps watchdog that will do M552-S0 and M552-S1 after signal lost
?

[c]

M122
SENDING:M122
=== Diagnostics ===
Used output buffers: 1 of 32 (9 max)
=== Platform ===
RepRapFirmware for Duet WiFi version 1.19 running on Duet WiFi 1.0
Board ID: 08DAM-9K9K2-NGNS0-7JKDL-3SD6Q-KR37K
Static ram used: 21176
Dynamic ram used: 96064
Recycled dynamic ram: 1544
Stack ram used: 4008 current, 9300 maximum
Never used ram: 2988
Last reset 00:15:50 ago, cause: power up
Last software reset reason: User, spinning module GCodes, available RAM 3224 bytes (slot 2)
Software reset code 0x0003, HFSR 0x00000000, CFSR 0x00000000, ICSR 0x00400000, BFAR 0xe000ed38, SP 0xffffffff
Error status: 0
[ERROR] Error status: 0

Free file entries: 9
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest block write time: 24.9ms
MCU temperature: min 36.8, current 43.1, max 43.6
Supply voltage: min 11.8, current 12.0, max 12.1, under voltage events: 0, over voltage events: 0
Driver 0: stalled standstill
Driver 1: stalled standstill
Driver 2: stalled standstill
Driver 3: standstill
Driver 4: standstill
Date/time: 2017-08-27 08:37:51
Slowest main loop (seconds): 0.078613; fastest: 0.000061
=== Move ===
MaxReps: 0, StepErrors: 0, FreeDm: 240, MinFreeDm 240, MaxWait: 0ms, Underruns: 0, 0
Scheduled moves: 0, completed moves: 0
Bed compensation in use: none
Bed probe heights: 0.000 0.000 0.000 0.000 0.000
=== Heat ===
Bed heater = 0, chamber heater = -1
Heater 0 is on, I-accum = 0.0
Heater 1 is on, I-accum = 0.2
=== GCodes ===
Segments left: 0
Stack records: 2 allocated, 0 in use
Movement lock held by null
http is idle in state(s) 0
telnet is idle in state(s) 0
file is doing "M190 S110 " in state(s) 0
serial is ready with "M122" in state(s) 0
aux is idle in state(s) 0
daemon is idle in state(s) 0
queue is idle in state(s) 0
autopause is idle in state(s) 0
Code queue is empty.
Network state is running
WiFi module is connected to access point
WiFi firmware version 1.19
WiFi MAC address 5c:cf:7f:a4:0d:77
WiFi Vcc 3.04, reset reason Turned on by main processor
WiFi flash size 4194304, free heap 39720
WiFi IP address 192.168.11.233
WiFi signal strength -76dBm
HTTP sessions: 1 of 8
Socket states: 0 0 0 0 0 0 0 0
Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0)

[/c]

dc42

The WiFi module is already supposed to reconnect if it loses the signal, because we are calling the SDK function that enables that. But that code is closed source and I am not sure that it it working, so it is on my list to test soon.

c310

here is another dropout: web intertface lost connection, but i was connected via USB…
network is running, but IP is lost.

is it possible to use manual IP instead of DHCP?

[c]
Code queue is empty.
Network state is running
WiFi module is connected to access point
WiFi firmware version 1.19
WiFi MAC address 5c:cf:7f:a4:0d:77
WiFi Vcc 3.04, reset reason Turned on by main processor
WiFi flash size 4194304, free heap 39488
WiFi IP address 0.0.0.0
WiFi signal strength -78dBm
HTTP sessions: 1 of 8
Socket states: 0 0 0 0 0 0 0 0
[/c]

Update: M552 P192.168.xx.xx does not update IP address … (even after this command M122 gives IP of 0.0.0.0)

dc42

1. Please try the 1.19+4 version, see separate thread.

2. For the Duet WiFi, if you want to set the IP address you do that in the M587 command.

c310

installed 1.19+4 it does reconnect… but
what is a way to solder external WiFi antenna to the board?

which pin or where cable should go?

p.s. i have a delta printer and board is under heatbed (that is aluminium). at the moment i do not want to change printer setup...
probably removing heatbed will increase signal strength, but antenna is much convenient

dc42

If you search the web for ESP8266 and external antenna, you will find a few write-ups from people who have done that.

I too have a delta printer with the Duet under the bed, but I have the wifi antenna poking out through a slot at the side. See https://www.thingiverse.com/thing:965396.