I have installed a Duet Ethernet board and just had my first successful burn. 
Connected the heater ground pin to the laser fire pin. And connected the ground of the laser power supply to a ground pin of the Duet.
PWM control seems to work (getting different colors of burn), but I have to figure out the correct frequency.
The smoothieboards use pwm per period in microseconds. And not sure if this is the same as Hz.
@chrishamm I got the service working by running as root user using a umask 0000. That way the created socket is readable by dsf user.
There must be a better way to do this, but sadly I am not an expert on user management in linux.
But for development this works.
I tried running the script as a service with the dsf user. But now the DuetControlServer is dropping the connection due to missing permissions.
Sep 07 14:23:25 duet3 DuetControlServer[3666]: [error] IPC#67: Failed to find plugin permissions for pid #6017
Sep 07 14:23:25 duet3 DuetControlServer[3666]: [warn] IPC#67: Terminating connection due to insufficient permissions
I am running a stand-alone c# application on the pi and don't want to use the plugins 'yet' due to easy-er debugging. What is the best way to get these permissions working?
@chrishamm That makes sense, just tested with the pi user, but that also is giving permission errors.
Perhaps it is a good idea to update the documentation how to properly run these testing scripts.
Upping the permissions on the /run/dsf/custom-http-endpoint/demo-GET.sock solves the issue.
I am running the test scrips as root, perhaps it is better to use a different user? Or is there soms sort of permission mismatch during the installation?
@falcounet I will try that example perhaps I have more luck with that one. Are you running the same firmware or a newer version?
I did manage to get the faul that is occuring:
Sep 07 10:54:39 duet3 DuetWebServer[665]: Microsoft.AspNetCore.Server.Kestrel.Connections[39] Connection id "0HMKGLC886QRH" accepted.
Sep 07 10:54:39 duet3 DuetWebServer[665]: Microsoft.AspNetCore.Server.Kestrel.Connections[1] Connection id "0HMKGLC886QRH" started.
Sep 07 10:54:59 duet3 DuetWebServer[665]: DuetWebServer.Services.ModelObserver[0] New number of custom HTTP endpoints: 0
Sep 07 10:54:59 duet3 sudo[3741]: pam_unix(sudo:session): session closed for user root
Sep 07 10:55:03 duet3 sudo[3813]: pi : TTY=pts/0 ; PWD=/opt/dsf/bin ; USER=root ; COMMAND=./CustomHttpEndpoint
Sep 07 10:55:03 duet3 sudo[3813]: pam_unix(sudo:session): session opened for user root by pi(uid=0)
Sep 07 10:55:04 duet3 DuetWebServer[665]: DuetWebServer.Services.ModelObserver[0] New number of custom HTTP endpoints: 1
Sep 07 10:55:04 duet3 DuetWebServer[665]: DuetWebServer.Services.ModelObserver[0] Registered HTTP GET endpoint via /machine/custom-http-endpoint/demo
Sep 07 10:55:49 duet3 DuetWebServer[665]: Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets[6] Connection id "0HMKGLC886QRH" received FIN.
Sep 07 10:55:49 duet3 DuetWebServer[665]: Microsoft.AspNetCore.Server.Kestrel.Connections[39] Connection id "0HMKGLC886QRI" accepted.
Sep 07 10:55:49 duet3 DuetWebServer[665]: Microsoft.AspNetCore.Server.Kestrel.Connections[1] Connection id "0HMKGLC886QRI" started.
Sep 07 10:55:49 duet3 DuetWebServer[665]: Microsoft.AspNetCore.Server.Kestrel.Connections[10] Connection id "0HMKGLC886QRH" disconnecting.
Sep 07 10:55:49 duet3 DuetWebServer[665]: Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets[7] Connection id "0HMKGLC886QRH" sending FIN because: "The client closed the connection."
Sep 07 10:55:49 duet3 DuetWebServer[665]: Microsoft.AspNetCore.Hosting.Diagnostics[1] Request starting HTTP/1.1 GET http://10.0.0.2/machine/custom-http-endpoint/demo - -
Sep 07 10:55:49 duet3 DuetWebServer[665]: Microsoft.AspNetCore.HostFiltering.HostFilteringMiddleware[2] All hosts are allowed.
Sep 07 10:55:49 duet3 DuetWebServer[665]: Microsoft.AspNetCore.Routing.Matching.DfaMatcher[1000] No candidates found for the request path '/machine/custom-http-endpoint/demo'
Sep 07 10:55:49 duet3 DuetWebServer[665]: Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware[2] Request did not match any endpoints
Sep 07 10:55:49 duet3 DuetWebServer[665]: Microsoft.AspNetCore.Server.Kestrel.Connections[2] Connection id "0HMKGLC886QRH" stopped.
Sep 07 10:55:49 duet3 DuetWebServer[665]: DuetWebServer.Authorization.SessionKeyAuthenticationHandler[8] AuthenticationScheme: SessionKey was successfully authenticated.
Sep 07 10:55:49 duet3 DuetWebServer[665]: Microsoft.AspNetCore.Server.Kestrel[13] Connection id "0HMKGLC886QRG", Request id "0HMKGLC886QRG:00000005": An unhandled exception was thrown by the application. System.Net.Internals.SocketExceptionFactory+ExtendedSocketException (13): Permission denied /run/dsf/custom-http-endpoint/demo-GET.sock at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress) at System.Net.Sockets.Socket.Connect(EndPoint remoteEP) at DuetWebServer.Middleware.HttpEndpointConnection.Connect(String socketPath) in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetWebServer/Middleware/HttpEndpointConnection.cs:line 31 at DuetWebServer.Middleware.CustomEndpointMiddleware.InvokeAsync(HttpContext context) in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetWebServer/Middleware/CustomEndpointMiddleware.cs:line 97 at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication`1 application)
Sep 07 10:55:49 duet3 DuetWebServer[665]: Microsoft.AspNetCore.Server.Kestrel.Connections[9] Connection id "0HMKGLC886QRG" completed keep alive response.
Sep 07 10:55:49 duet3 DuetWebServer[665]: Microsoft.AspNetCore.Hosting.Diagnostics[2] Request finished HTTP/1.1 GET http://10.0.0.2/machine/custom-http-endpoint/demo - - - 500 0 - 31.3982ms
So the first thing is strange since it is telling that no endpoint is matched. And then there is a permission error on the unix socket that is created.
@jay_s_uk Thanks, I am trying to figure out where DSF puts it's logs on the SBC. But so far no luck on debugging.
@jay_s_uk The feature is for SBC:
https://github.com/Duet3D/DuetSoftwareFramework#customhttpendpoint
This should grant me an option to create a custom HTTP endpoint for custom sofware.
Fresh install on the PI:
Board: Duet 3 MB6HC (MB6HC)
DSF Version: 3.4.1
Firmware: RepRapFirmware for Duet 3 MB6HC 3.4.0 (2022-03-15)
After Running the CustomHttpEndPoint the http status code returned after the request is 500.
When closing the script a 404 error is returned, so routing seems to work. But the request is not properly handled.
I have also tried to create a custom HTTP endpoint using the c# library but there I am also running into the same issue.
@jay_s_uk And I am planning to spend some more time testing why the g-code from Lightburn is a mess, I have ordered a cheap MKS S-base board since it should be compatible with lightburn, but I would rather keep using the Duet, since everything on the s-base is a big downgrade compared to the duet.
@jay_s_uk I have not tried images etc.
But filling vectors works well.
LaserWeb is a good piece of software, but it being totally free. It just can't be compared to lightburn as this is a far superior piece of software.