@Phaedrux sorry for the late reply.
Thats some copy/paste error. Its not in the config.g file

So. After re-doing my config.g the Thermistor is working again and I finished some smaller prints without issue.

However, something is still not right.
I can boot up everything alright, but if I activate my filament sensor in config.g (duet magnetic filament sensor), DCS fails. Constantly.
If I update config.g and comment it out, I need to reboot/power cycle to get the machine working.
If I activate the filament sensor through the console in DWC, everything is fine. Same command. Copy/paste.

; Configuration file for My Printer
; Communication and general
M111 S0                                 ; Debug off
;M550 P"railcore"                  		; Machine name and Netbios name (can be anything you like)


G21						;Work in millimetres
G90						;Send absolute coordinates...
M83						;...but relative extruder moves

; Axis and motor configuration
M569 P0 S1	D3				;Drive 0 X / Rear
M569 P1 S0	D3				;Drive 1 Y / Front
M569 P2 S1	D3				;Drive 2 Z Front Left
M569 P3 S0	D3				;Drive 3 Z Rear Left
M569 P4 S1	D3				;Drive 4 Z Right
M569 P5 S1	D3				;Drive 5 Extruder
M669 K1						;corexy mode

M584 X0 Y1 Z2:3:4 E5				; Map X to drive 0 Y to drive 1, Z to drives 2, 3, 4, and E to drive 5
;Leadscrew locations
M671 X-10:-10:333  Y22.5:277.5:150 S7.5		;X -10, -10, 315

M350 X16 Y16 Z16 E16 I1					;set 16x microstepping for axes with interpolation
M906 X1400 Y1400 Z1200 E1200 I60		;Set motor currents (mA)
M201 X2500 Y2500 Z100 E1500				;Accelerations (mm/s^2)
M203 X24000 Y24000 Z900 E3600			;Maximum speeds (mm/min) was Z1800 tr8*4
M566 X800 Y800 Z100 E1500				;Maximum jerk speeds mm/minute E60 Z60
M208 X290 Y290 Z300						;set axis maxima and high homing switch positions (adjust to suit your machine)
M208 X0 Y0 Z0 S1						;set axis minima and low homing switch positions (adjust to make X=0 and Y=0 the edges of the bed)
M92 X200 Y200 Z800 E388					;steps/mm

; End Stops
M574 X1 S1 P"io4.in"				;Map the X endstop to io4.in
M574 Y1 S1 P"io1.in"				;May the Y endstop to io1.in

; Thermistors
M308 S0 P"temp0" Y"thermistor" A"bed_heat" T100000 B4240 H0 L0 		;Bed thermistor - connected to temp0
M308 S1 P"temp1" Y"thermistor" A"e0_heat" T100000 B4725 C7.06e-8 H0 L0	;duet3 e3d thermistor - connected to e0_heat

;Define Heaters
M950 H0 C"out0" T0				;Bed heater is on out0
M950 H1 C"out2" T1				;Hotend heater is on out2

;Define Bed
M140 H0

M307 H0 A90.0 C700.0 D10.0 S1.00 B1 		;Keenovo duet 3 configuration
M307 H1 A310.1 C144.7 D2.6 S1.00 B0 		;E3D Hotend  duet 3 configuration

M570 S360					;Hot end may be a little slow to heat up so allow it 180 seconds
M143 S285					;Set max hotend temperature			

; Fans
M950 F0 C"out3"					;Hotend fan on "out3" connector
M106 P0 S255 H1 T50 			;enable thermostatic mode for hotend fan
M950 F1 C"out7"					;Layer fan on "out7" connector
M106 P1 S0 						;Layer Fan

; Tool definitions
M563 P0 D0 H1 F1                       		;Define tool 0 (hotend)
G10 P0 S0 R0                        		;Set tool 0 operating and standby temperatures

M929 P"eventlog.txt" S1 ; start logging to file eventlog.txt

;BLTouch
M558 P9 C"io7.in" H5 R1 F50 T6000 A5 S0.02 B1	;define the bltouch input on io5.in
M950 S0 C"io7.out"				;define the bltouch servo on io7.out
G31 X-4 Y43 Z3.116			;set the offsets for the bltouch

;Filament sensor
;M591 D0 S1 P3 C"io5.in" R30:250 L25.63 E3.0						; Duet3D magnetic filament sensor cross-connected to io5.in

M501 					; load overrides
T0						;select first hot end

@chrishamm Thats interesting.
The {1} lines are a by-product of copy/pasting I think, they are not in my original config.g on the Pi.
However, I deleted the empty lines just to be sure and commented out the M550.
Now it booted up.
After every change in config.g though, DCS would stop and take a while to reload.
Also, my hotend thermistor would not work anymore.
I tried a different one, factory new - same result.
I'm now trying to figure out what might be wrong with the config, since it worked before. Too much for today though. Gonna start fresh tomorrow:)

Thanks for the help, much appreciated!

Sorry for posting double...

So. I flashed the newest DuetPi from /testing, booted the printer up and wahooo! It works!

Uploaded my config.g - BAM. DCS has stopped.
On power cycling the whole machine, I get "DCS is not started" in DWC.
EDIT: Just noticed that, after sitting there for like 30s-1min with state "DCS is not started" it suddenly can connect - for close to a second, until DCS dies and DWC returns "DCS has been stopped" (cant connect to duet3.local)

Can anyone check my config.g ? Is there something in there that kills DSC?!?!

alright thanks for the input @Danal

I'll try the new DuetPi build first, then get to read up on bossa.

Now it wont even work on the stable branch with a new SD and new image.
Guess its a local hardware problem then.

@chrishamm I'm using the official DuetPi image provided by duet3d ‍️

Journalctl reports the same "cannot connect to duet, cannot put into line mode"

Guess I'll revert to stable. Too bad, I like to love on the bleeding edge

@bearer thanks for the info. I just started the update and am stuck at "setting up RepRapFirmware"
Bah.

Setting up reprapfirmware (2.1.1-1) ...
[fatal] Could not connect to Duet (Error 16. Cannot put line into event mode.)

Now that's interesting. Cannot connect to duet?

Hey,

I recently updated to the newest unstable branch and since then I can’t get my printer/the duet to boot up/work

I will attach my config.g

Heres what I did until now:
Upgraded exisiting installation. Not working, “DCS not started” or similar messages on the web control.

Recreated the boot disc with newest image, updated to stable, than to unstable branch.
Using standard empty config.g: Works.
Using my config.g: no way

I have no idea yet why though.

I’ll attach the output from the debug command as well.

I strongly believe theres some gcode thats either gotten changed or has to be moved to a different spot?

Thanks in advance!!

Here goes:

Linux railcore 4.19.97-v7l+ #1294 SMP Thu Jan 30 13:21:14 GMT 2020 armv7l

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Sat Apr 25 16:06:02 2020 from fe80::c9d:e3bb:8f64:c322%eth0
pi@railcore:~ $ sudo /opt/dsf/bin/DuetControlServer -l debug
Duet Control Server v2.1.0
Written by Christian Hammacher for Duet3D
Licensed under the terms of the GNU Public License Version 3

[info] Settings loaded
[info] Environment initialized
[info] Connection to Duet established
[info] IPC socket created at /var/run/dsf/dcs.sock
[debug] Updated key volumes
[debug] Requesting update of key boards, seq 0 -> 0
[debug] Requesting update of key directories, seq 0 -> 0
[debug] Requesting update of key fans, seq 0 -> 3
[debug] Requesting update of key heat, seq 0 -> 6
[debug] Requesting update of key inputs, seq 0 -> 0
[debug] Requesting update of key job, seq 0 -> 36
[debug] Requesting update of key move, seq 0 -> 25
[debug] Requesting update of key network, seq 0 -> 2
[debug] Requesting update of key sensors, seq 0 -> 2
[debug] Requesting update of key spindles, seq 0 -> 0
[debug] Requesting update of key state, seq 0 -> 1
[debug] Requesting update of key tools, seq 0 -> 2
[debug] Requesting update of key volumes, seq 0 -> 0
[debug] Updated key boards
[debug] Updated key directories
[debug] Updated key fans
[debug] Updated key heat
[debug] Updated key inputs
[debug] Updated key job
[debug] Updated key move
[debug] Updated key network
[fatal] Abnormal program termination
[fatal] Update task faulted
   System.ArgumentException: Property set method not found.
   at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, BindingFlags invokeAttr, Binder binder, Object[] index, CultureInfo culture)
   at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, Object[] index)
   at System.Reflection.PropertyInfo.SetValue(Object obj, Object value)
   at DuetAPI.Machine.ModelObject.UpdateFromJson(JsonElement jsonElement, Boolean ignoreSbcProperties) in /home/christian/duet/DuetSoftwareFramework/src/DuetAPI/Machine/Base/ModelObject.cs:line 237
   at DuetAPI.Machine.FilamentMonitor.UpdateFromJson(JsonElement jsonElement, Boolean ignoreSbcProperties) in /home/christian/duet/DuetSoftwareFramework/src/DuetAPI/Machine/Sensors/FilamentMonitors/FilamentMonitor.cs:line 84
   at DuetAPI.Machine.ModelObject.UpdateFromJson(JsonElement jsonElement) in /home/christian/duet/DuetSoftwareFramework/src/DuetAPI/Machine/Base/ModelObject.cs:line 209
   at DuetAPI.Machine.FilamentMonitor.UpdateFromJson(JsonElement jsonElement, Boolean ignoreSbcProperties) in /home/christian/duet/DuetSoftwareFramework/src/DuetAPI/Machine/Sensors/FilamentMonitors/FilamentMonitor.cs:line 80
   at DuetAPI.Machine.ModelCollectionHelper.UpdateFromJson(IList list, Type itemType, JsonElement jsonElement, Boolean ignoreSbcProperties) in /home/christian/duet/DuetSoftwareFramework/src/DuetAPI/Machine/Base/ModelCollection.cs:line 214
   at DuetAPI.Machine.ModelObject.UpdateFromJson(JsonElement jsonElement, Boolean ignoreSbcProperties) in /home/christian/duet/DuetSoftwareFramework/src/DuetAPI/Machine/Base/ModelObject.cs:line 264
   at DuetAPI.Machine.MachineModel.UpdateFromFirmwareModel(String key, JsonElement jsonElement) in /home/christian/duet/DuetSoftwareFramework/src/DuetAPI/Machine/MachineModel.cs:line 149
   at DuetControlServer.Model.Updater.Run() in /home/christian/duet/DuetSoftwareFramework/src/DuetControlServer/Model/Updater.cs:line 176
[fatal] Update task faulted
   System.ArgumentException: Property set method not found.
   at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, BindingFlags invokeAttr, Binder binder, Object[] index, CultureInfo culture)
   at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, Object[] index)
   at System.Reflection.PropertyInfo.SetValue(Object obj, Object value)
   at DuetAPI.Machine.ModelObject.UpdateFromJson(JsonElement jsonElement, Boolean ignoreSbcProperties) in /home/christian/duet/DuetSoftwareFramework/src/DuetAPI/Machine/Base/ModelObject.cs:line 237
   at DuetAPI.Machine.FilamentMonitor.UpdateFromJson(JsonElement jsonElement, Boolean ignoreSbcProperties) in /home/christian/duet/DuetSoftwareFramework/src/DuetAPI/Machine/Sensors/FilamentMonitors/FilamentMonitor.cs:line 84
   at DuetAPI.Machine.ModelObject.UpdateFromJson(JsonElement jsonElement) in /home/christian/duet/DuetSoftwareFramework/src/DuetAPI/Machine/Base/ModelObject.cs:line 209
   at DuetAPI.Machine.FilamentMonitor.UpdateFromJson(JsonElement jsonElement, Boolean ignoreSbcProperties) in /home/christian/duet/DuetSoftwareFramework/src/DuetAPI/Machine/Sensors/FilamentMonitors/FilamentMonitor.cs:line 80
   at DuetAPI.Machine.ModelCollectionHelper.UpdateFromJson(IList list, Type itemType, JsonElement jsonElement, Boolean ignoreSbcProperties) in /home/christian/duet/DuetSoftwareFramework/src/DuetAPI/Machine/Base/ModelCollection.cs:line 214
   at DuetAPI.Machine.ModelObject.UpdateFromJson(JsonElement jsonElement, Boolean ignoreSbcProperties) in /home/christian/duet/DuetSoftwareFramework/src/DuetAPI/Machine/Base/ModelObject.cs:line 264
   at DuetAPI.Machine.MachineModel.UpdateFromFirmwareModel(String key, JsonElement jsonElement) in /home/christian/duet/DuetSoftwareFramework/src/DuetAPI/Machine/MachineModel.cs:line 149
   at DuetControlServer.Model.Updater.Run() in /home/christian/duet/DuetSoftwareFramework/src/DuetControlServer/Model/Updater.cs:line 176
[debug] SPI task terminated
[debug] IPC task terminated
[debug] Job task terminated
[debug] Periodic updater task terminated
[info] Application has shut down
pi@railcore:~ $ 

Config.g:

; Configuration file for My Printer
; Communication and general
M111 S0                                 ; Debug off
M550 Prailcore                  		; Machine name and Netbios name (can be anything you like)


G21						;Work in millimetres
G90						;Send absolute coordinates...
M83						;...but relative extruder moves

; Axis and motor configuration
M569 P0 S1	D3				;Drive 0 X / Rear
M569 P1 S0	D3				;Drive 1 Y / Front
M569 P2 S1	D3				;Drive 2 Z Front Left
M569 P3 S0	D3				;Drive 3 Z Rear Left
M569 P4 S1	D3				;Drive 4 Z Right
M569 P5 S1	D3				;Drive 5 Extruder
M669 K1						;corexy mode

M584 X0 Y1 Z2:3:4 E5				; Map X to drive 0 Y to drive 1, Z to drives 2, 3, 4, and E to drive 5
;Leadscrew locations
M671 X-10:-10:333  Y22.5:277.5:150 S7.5		;X -10, -10, 315

M350 X16 Y16 Z16 E16 I1					;set 16x microstepping for axes with interpolation
M906 X1400 Y1400 Z1200 E1200 I60		;Set motor currents (mA)
M201 X2500 Y2500 Z100 E1500				;Accelerations (mm/s^2)
M203 X24000 Y24000 Z900 E3600			;Maximum speeds (mm/min) was Z1800 tr8*4
M566 X800 Y800 Z100 E1500				;Maximum jerk speeds mm/minute E60 Z60
M208 X290 Y290 Z300						;set axis maxima and high homing switch positions (adjust to suit your machine)
M208 X0 Y0 Z0 S1						;set axis minima and low homing switch positions (adjust to make X=0 and Y=0 the edges of the bed)
M92 X200 Y200 Z800 E388					;steps/mm

; End Stops
M574 X1 S1 P"io4.in"				;Map the X endstop to io4.in
M574 Y1 S1 P"io1.in"				;May the Y endstop to io1.in

; Thermistors
M308 S0 P"temp0" Y"thermistor" A"bed_heat" T100000 B4240 H0 L0 			;Bed thermistor - duet 3, connected to temp0

M308 S1 P"temp1" Y"thermistor" A"e0_heat" T100000 B4725 C7.06e-8 H0 L0	;duet3 e3d

;Define Heaters
M950 H0 C"out0" T1				;Bed heater is on out0
M950 H1 C"out2" T2				;Hotend heater is on out2

;Define Bed
M140 H0

M307 H0 A90.0 C700.0 D10.0 S1.00 B1 		;Keenovo duet 3 configuration
M307 H1 A548.8 C298.6 D4.6 S1.00 B0 		;Hotend  duet 3 configuration

M570 S360					;Hot end may be a little slow to heat up so allow it 180 seconds
M143 S285					;Set max hotend temperature

; Fans
M950 F0 C"out3"					;Hotend fan on "out3" connector
M106 P0 S255 H1 T50 				;enable thermostatic mode for hotend fan
M950 F1 C"out7"					;Layer fan on "out7" connector
M106 P1 S0 					;Layer Fan

; Tool definitions
M563 P0 D0 H1 F1                       		;Define tool 0 (hotend)
G10 P0 S0 R0                        		;Set tool 0 operating and standby temperatures

;M929 P"eventlog.txt" S1 ; start logging to file eventlog.txt

;BLTouch
M558 P9 C"io7.in" H5 R1 F50 T6000 A5 S0.02 B1	;define the bltouch input on io5.in
M950 S0 C"io7.out"				;define the bltouch servo on io7.out
G31 X-4 Y43 Z0				;set the offsets for the bltouch

;Filament sensor
;M591 D0 S1 P3 C"io5.in" R30:250 L25.63 E3.0						; Duet3D magnetic filament sensor cross-connected to io5.in

M501 					; load overrides
T0						;select first hot end

I have had the same problem. I suspect a incorrect pause.g file, haven't dug deeper yet.