@bearer Hello, I managed to get the fan speed with this command: M950 F0 C"!out4+out4.tach"
The value reported by DWC is around 4670 RPM which corresponds to the (+/- 10%) 5000 RPM announced in the specs.
So this Noctua seems to be too slow for my needs, I'll change the design of my printer to use a PWM radial fan instead.
Anyway, thanks @bearer & @Phaedrux for your help.
Have a nice day,
@jay_s_uk Okay thanks I didn't know. I had this SD card on the Duet since the beginning without any trouble and I forget about it.
Anyway I removed it and it works great now 
I removed the SD card on the duet and rebooted and now the communication works even with version 3.2b3.2
Thank you @chrishamm for your help!
Yes I do have a SD card on the Duet, am I not supposed to?
@chrishamm Here is the result of "sudo journalctl -u duetcontrolserver -e" after I tried again to upgrade to 3.2b3.2:
-- Logs begin at Sat 2020-11-14 23:00:45 CET, end at Sat 2020-11-14 23:05:01 CET. --
Nov 14 23:00:49 duet3 systemd[1]: Started Duet Control Server.
Nov 14 23:00:52 duet3 DuetControlServer[388]: Duet Control Server v3.1.1
Nov 14 23:00:52 duet3 DuetControlServer[388]: Written by Christian Hammacher for Duet3D
Nov 14 23:00:52 duet3 DuetControlServer[388]: Licensed under the terms of the GNU Public License Version 3
Nov 14 23:00:53 duet3 DuetControlServer[388]: [info] Settings loaded
Nov 14 23:00:53 duet3 DuetControlServer[388]: [info] Environment initialized
Nov 14 23:00:53 duet3 DuetControlServer[388]: [info] Connection to Duet established
Nov 14 23:00:54 duet3 DuetControlServer[388]: [info] IPC socket created at /var/run/dsf/dcs.sock
Nov 14 23:01:32 duet3 DuetControlServer[388]: [info] System time has been changed
Nov 14 23:02:22 duet3 systemd[1]: Stopping Duet Control Server...
Nov 14 23:02:22 duet3 DuetControlServer[388]: [warn] Received SIGTERM, shutting down...
Nov 14 23:02:22 duet3 systemd[1]: duetcontrolserver.service: Main process exited, code=exited, status=143/n/a
Nov 14 23:02:22 duet3 systemd[1]: duetcontrolserver.service: Failed with result 'exit-code'.
Nov 14 23:02:22 duet3 systemd[1]: Stopped Duet Control Server.
Nov 14 23:02:42 duet3 systemd[1]: Started Duet Control Server.
Nov 14 23:02:42 duet3 DuetControlServer[1132]: Duet Control Server v3.2.0-beta3
Nov 14 23:02:42 duet3 DuetControlServer[1132]: Written by Christian Hammacher for Duet3D
Nov 14 23:02:42 duet3 DuetControlServer[1132]: Licensed under the terms of the GNU Public License Version 3
Nov 14 23:02:43 duet3 DuetControlServer[1132]: [info] Settings loaded
Nov 14 23:02:44 duet3 DuetControlServer[1132]: [info] Environment initialized
Nov 14 23:02:44 duet3 DuetControlServer[1132]: [warn] Downgrading protocol version 3 to 2
Nov 14 23:02:44 duet3 DuetControlServer[1132]: [warn] Incompatible firmware, please upgrade as soon as possible
Nov 14 23:02:44 duet3 DuetControlServer[1132]: [info] Connection to Duet established
Nov 14 23:02:44 duet3 DuetControlServer[1132]: [info] IPC socket created at /var/run/dsf/dcs.sock
Nov 14 23:02:45 duet3 DuetControlServer[1132]: [error] Failed to merge JSON: {"key":"spindles","flags":"d99vn","result":[{"active":0,"current":0,"frequency":0,"max":10000.0000000,"tool":-1},{"active":0,"current":0,"frequency":0,"max":100
Nov 14 23:02:45 duet3 DuetControlServer[1132]: System.Text.Json.JsonException: Failed to deserialize property [Spindle].Max (type Int32) from JSON 10000.0000000
Nov 14 23:02:45 duet3 DuetControlServer[1132]: ---> System.Text.Json.JsonException: The JSON value could not be converted to System.Int32. Path: $ | LineNumber: 0 | BytePositionInLine: 13.
Nov 14 23:02:45 duet3 DuetControlServer[1132]: ---> System.FormatException: Either the JSON value is not in a supported format, or is out of bounds for an Int32.
Nov 14 23:02:45 duet3 DuetControlServer[1132]: at System.Text.Json.Utf8JsonReader.GetInt32()
Nov 14 23:02:45 duet3 DuetControlServer[1132]: at System.Text.Json.Serialization.Converters.JsonConverterInt32.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options)
Nov 14 23:02:45 duet3 DuetControlServer[1132]: at System.Text.Json.JsonPropertyInfoNotNullable`4.OnRead(ReadStack& state, Utf8JsonReader& reader)
Nov 14 23:02:45 duet3 DuetControlServer[1132]: at System.Text.Json.JsonPropertyInfo.Read(JsonTokenType tokenType, ReadStack& state, Utf8JsonReader& reader)
Nov 14 23:02:45 duet3 DuetControlServer[1132]: at System.Text.Json.JsonSerializer.ReadCore(JsonSerializerOptions options, Utf8JsonReader& reader, ReadStack& readStack)
Nov 14 23:02:45 duet3 DuetControlServer[1132]: --- End of inner exception stack trace ---
Nov 14 23:02:45 duet3 DuetControlServer[1132]: at System.Text.Json.ThrowHelper.ReThrowWithPath(ReadStack& readStack, Utf8JsonReader& reader, Exception ex)
Nov 14 23:02:45 duet3 DuetControlServer[1132]: at System.Text.Json.JsonSerializer.ReadCore(JsonSerializerOptions options, Utf8JsonReader& reader, ReadStack& readStack)
Nov 14 23:02:45 duet3 DuetControlServer[1132]: at System.Text.Json.JsonSerializer.ReadCore(Type returnType, JsonSerializerOptions options, Utf8JsonReader& reader)
Nov 14 23:02:45 duet3 DuetControlServer[1132]: at System.Text.Json.JsonSerializer.Deserialize(String json, Type returnType, JsonSerializerOptions options)
Nov 14 23:02:45 duet3 DuetControlServer[1132]: at DuetAPI.ObjectModel.ModelObject.UpdateFromJson(JsonElement jsonElement, Boolean ignoreSbcProperties) in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetAPI/ObjectModel/Base/ModelO
Nov 14 23:02:45 duet3 DuetControlServer[1132]: --- End of inner exception stack trace ---
Nov 14 23:02:45 duet3 DuetControlServer[1132]: at DuetAPI.ObjectModel.ModelObject.UpdateFromJson(JsonElement jsonElement, Boolean ignoreSbcProperties) in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetAPI/ObjectModel/Base/ModelO
Nov 14 23:02:45 duet3 DuetControlServer[1132]: at DuetAPI.ObjectModel.ModelCollectionHelper.UpdateFromJson(IList list, Type itemType, JsonElement jsonElement, Boolean ignoreSbcProperties) in /home/christian/Duet3D/DuetSoftwareFramewor
Nov 14 23:02:45 duet3 DuetControlServer[1132]: at DuetAPI.ObjectModel.ObjectModel.InternalUpdateFromModel(String key, JsonElement jsonElement, Boolean ignoreSbcProperties) in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetAPI/Ob
Nov 14 23:02:45 duet3 DuetControlServer[1132]: at DuetAPI.ObjectModel.ObjectModel.UpdateFromFirmwareModel(String key, JsonElement jsonElement) in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetAPI/ObjectModel/ObjectModel.cs:line
Nov 14 23:02:45 duet3 DuetControlServer[1132]: at DuetControlServer.Model.Updater.Run() in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetControlServer/Model/Updater.cs:line 212
Nov 14 23:02:50 duet3 DuetControlServer[1132]: [info] Flashing IAP binary
Nov 14 23:02:51 duet3 DuetControlServer[1132]: [info] Flashing RepRapFirmware
Nov 14 23:02:57 duet3 DuetControlServer[1132]: [info] Verifying checksum
Nov 14 23:02:59 duet3 DuetControlServer[1132]: [info] Firmware update successful
Nov 14 23:03:00 duet3 DuetControlServer[1132]: [warn] Lost connection to Duet (Timeout while waiting for transfer ready pin)
And for information it worked great with versions 3.2b1 and 3.2b2
@chrishamm Hi, I flashed the Duet to version b3.2 via bossa, the dial LED was pulsing but the communication between the Duet and the Pi was still broken. So I flashed version 3.1.1 to the Duet and now the communication works again even if the Pi is still on version 3.2-b3.2.
Hello,
As @Phaedrux suggested I changed my setup to power the Pi separately and as expected it was still working perfectly.
And then I saw that @dc42 released the version 3.2beta3.2 of ReprapFirmware and that one of the purpose of this release is to address communication issues with an attached single board computer. So I decided to give a new shot to the 3.2beta3 and... I encountered the same issue that the one described in my first post 
The upgrade is stuck on "Sending update request to DCS..." for 25 minutes now and DuetWebControl is displaying this message: "Please wait while updates are being installed...". Usually this process takes a few seconds and I'm pretty sure that if I stop the upgrade I'll have the same communication problem as before.
Here are the upgrade logs:
sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
duetcontrolserver duetruntime duetsd duetsoftwareframework duettools duetwebcontrol duetwebserver reprapfirmware
8 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 33.9 MB of archives.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n]
Get:1 https://pkg.duet3d.com unstable/armv7 armhf duetsoftwareframework armhf 3.2.0-beta3 [2,034 B]
Get:2 https://pkg.duet3d.com unstable/armv7 armhf duetsd all 1.1.0 [2,102 B]
Get:3 https://pkg.duet3d.com unstable/armv7 armhf duettools armhf 3.2.0-beta3 [62.2 kB]
Get:4 https://pkg.duet3d.com unstable/armv7 armhf duetcontrolserver armhf 3.2.0-beta3 [226 kB]
Get:5 https://pkg.duet3d.com unstable/armv7 armhf duetruntime armhf 3.2.0-beta3 [28.9 MB]
Get:6 https://pkg.duet3d.com unstable/armv7 armhf duetwebserver armhf 3.2.0-beta3 [83.9 kB]
Get:7 https://pkg.duet3d.com unstable/armv7 armhf duetwebcontrol all 3.2.0-beta3 [3,507 kB]
Get:8 https://pkg.duet3d.com unstable/armv7 armhf reprapfirmware all 3.2.0-beta3-2 [1,157 kB]
Fetched 33.9 MB in 10s (3,450 kB/s)
Reading changelogs... Done
(Reading database ... 57772 files and directories currently installed.)
Preparing to unpack .../0-duetsoftwareframework_3.2.0-beta3_armhf.deb ...
Unpacking duetsoftwareframework (3.2.0-beta3) over (3.1.1) ...
Preparing to unpack .../1-duetsd_1.1.0_all.deb ...
Unpacking duetsd (1.1.0) over (1.0.6) ...
Preparing to unpack .../2-duettools_3.2.0-beta3_armhf.deb ...
Unpacking duettools (3.2.0-beta3) over (3.1.1) ...
Preparing to unpack .../3-duetcontrolserver_3.2.0-beta3_armhf.deb ...
Unpacking duetcontrolserver (3.2.0-beta3) over (3.1.1) ...
Preparing to unpack .../4-duetruntime_3.2.0-beta3_armhf.deb ...
Unpacking duetruntime (3.2.0-beta3) over (3.1.1) ...
Preparing to unpack .../5-duetwebserver_3.2.0-beta3_armhf.deb ...
Unpacking duetwebserver (3.2.0-beta3) over (3.1.0) ...
Preparing to unpack .../6-duetwebcontrol_3.2.0-beta3_all.deb ...
Unpacking duetwebcontrol (3.2.0-beta3) over (3.1.1) ...
Preparing to unpack .../7-reprapfirmware_3.2.0-beta3-2_all.deb ...
Unpacking reprapfirmware (3.2.0-beta3-2) over (3.1.1-1) ...
Setting up duetruntime (3.2.0-beta3) ...
Setting up duetcontrolserver (3.2.0-beta3) ...
Installing new version of config file /opt/dsf/conf/config.json ...
Creating group dsf with gid 995.
Creating user dsf (n/a) with uid 995 and gid 995.
Setting up duettools (3.2.0-beta3) ...
Setting up duetwebserver (3.2.0-beta3) ...
Setting up duetsoftwareframework (3.2.0-beta3) ...
To modify config files consider adding yourself to the dsf groupd: # usermod -a -G dsf <username>
Setting up duetwebcontrol (3.2.0-beta3) ...
Setting up duetsd (1.1.0) ...
Setting up reprapfirmware (3.2.0-beta3-2) ...
Sending update request to DCS...
So before I reboot and flash everything again, do you want me to try something or get some logs?
@Phaedrux It's a Pi3 and the only peripheral is the official raspberry camera. I didn't knew it's recommended to power them separately, I'll change my wiring. Thanks for the information!
@Phaedrux the Pi is powered by the Duet via the ribbon cable and the duet is powered by a 24V power supply on the "Power In" connector.
I flashed the Duet to the version 3.1.1 and flashed the Pi again too and now it's working. I'll stay on the stable version for now.
I don't really know why the communication was broken because both the Duet and the Pi seemed to work fine on their own.
Anyway, thanks everyone for your help!
Hello, I prepared a new SD card with the latest DuetPi image but I still have an error while trying to update to the unstable branch:
sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
duetcontrolserver duetruntime duetsd duetsoftwareframework duettools duetwebcontrol duetwebserver reprapfirmware
8 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 34.0 MB of archives.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n]
Get:1 https://pkg.duet3d.com unstable/armv7 armhf duetsoftwareframework armhf 3.2.0-beta3 [2,034 B]
Get:2 https://pkg.duet3d.com unstable/armv7 armhf duetsd all 1.1.0 [2,102 B]
Get:3 https://pkg.duet3d.com unstable/armv7 armhf duettools armhf 3.2.0-beta3 [62.2 kB]
Get:4 https://pkg.duet3d.com unstable/armv7 armhf duetcontrolserver armhf 3.2.0-beta3 [226 kB]
Get:5 https://pkg.duet3d.com unstable/armv7 armhf duetruntime armhf 3.2.0-beta3 [28.9 MB]
Get:6 https://pkg.duet3d.com unstable/armv7 armhf duetwebserver armhf 3.2.0-beta3 [83.9 kB]
Get:7 https://pkg.duet3d.com unstable/armv7 armhf duetwebcontrol all 3.2.0-beta3 [3,507 kB]
Get:8 https://pkg.duet3d.com unstable/armv7 armhf reprapfirmware all 3.2.0-beta3-1 [1,260 kB]
Fetched 34.0 MB in 9s (3,647 kB/s)
Reading changelogs... Done
(Reading database ... 57772 files and directories currently installed.)
Preparing to unpack .../0-duetsoftwareframework_3.2.0-beta3_armhf.deb ...
Unpacking duetsoftwareframework (3.2.0-beta3) over (3.1.1) ...
Preparing to unpack .../1-duetsd_1.1.0_all.deb ...
Unpacking duetsd (1.1.0) over (1.0.6) ...
Preparing to unpack .../2-duettools_3.2.0-beta3_armhf.deb ...
Unpacking duettools (3.2.0-beta3) over (3.1.1) ...
Preparing to unpack .../3-duetcontrolserver_3.2.0-beta3_armhf.deb ...
Unpacking duetcontrolserver (3.2.0-beta3) over (3.1.1) ...
Preparing to unpack .../4-duetruntime_3.2.0-beta3_armhf.deb ...
Unpacking duetruntime (3.2.0-beta3) over (3.1.1) ...
Preparing to unpack .../5-duetwebserver_3.2.0-beta3_armhf.deb ...
Unpacking duetwebserver (3.2.0-beta3) over (3.1.0) ...
Preparing to unpack .../6-duetwebcontrol_3.2.0-beta3_all.deb ...
Unpacking duetwebcontrol (3.2.0-beta3) over (3.1.1) ...
Preparing to unpack .../7-reprapfirmware_3.2.0-beta3-1_all.deb ...
Unpacking reprapfirmware (3.2.0-beta3-1) over (3.1.1-1) ...
Setting up duetruntime (3.2.0-beta3) ...
Setting up duetcontrolserver (3.2.0-beta3) ...
Installing new version of config file /opt/dsf/conf/config.json ...
Creating group dsf with gid 995.
Creating user dsf (n/a) with uid 995 and gid 995.
Setting up duettools (3.2.0-beta3) ...
Setting up duetwebserver (3.2.0-beta3) ...
Setting up duetsoftwareframework (3.2.0-beta3) ...
To modify config files consider adding yourself to the dsf groupd: # usermod -a -G dsf <username>
Setting up duetwebcontrol (3.2.0-beta3) ...
Setting up duetsd (1.1.0) ...
Setting up reprapfirmware (3.2.0-beta3-1) ...
[fatal] Could not connect to Duet (Timeout while waiting for transfer ready pin)
I don't understand why the connection between the Duet and the Pi doesn't work anymore.