Changing HVAC information brings errors on CAN bus.

In Icefish, agl-service-hvac is using the low-can write support, so I would not expect /etc/hvac.json to do anything.  It's likely there's something else going on, I'll try and get to some experiments to see if I can reproduce.

Okay I think I have now all the changes that are necessary. I starting my socketcan-service now after the networkd.service (propably to early but I haven't problems with that up to now). CANbus is working and I get updateted Information in the dashboard when I send the right can-data. That means mph are changing.

But hvac is not working more or less the hvac-service  I changed /etc/hvac.json changes according to my candevice

here is the output of jouralctl -f

, I wouldn't expect your service to be getting started with your changes, as you're not adding a dependency on it anywhere.  As I mentioned in my previous comment, look at what is done in the do_install_append in meta-agl/meta-agl-profile-graphical/recipes-apis/agl-service-windowmanager/agl-service-windowmanager_git.bb in Icefish. You should be able to do the same with afm-api-low-can@.service, i.e. add a dependency in an over-ride conf file in /etc/systemd/system/afm-api-low-can@.service.d, that would result in your service being started before low-can automatically.

: I've done the first steps https://git.automotivelinux.org/AGL/meta-agl/commit/?h=sandbox/walzert/can_build&id=bfe2291f5cd0a014bd7ef2904b08083b14ca6eb0

Do I have to do more than adding the socketcan*.service something like the enable? I recognized that you added

is that necassary to enable the service? Because my service was not starting on boot. But I could do it manually.

Just adding " <param name="urn:AGL:permission::platform:can:write" value="required" />" to  the "config.xml" is working. I can now write the values over canbus. But the hvac is not working at the moment , I'm doing a further research about that.

But I wll try it by a whole image that I will build.

Thank you for your help so far (: .

: first I installed a new building machine to do all the changes hope it is now working. I'm currently in the building process and waiting for finishing that.

For your information I don't have experience with yocto at all, beacuse ot that my questions might be stupid. I was digging in the meta-agl files and used the top-bottom approach from the hvac-application:

I have to change information here https://git.automotivelinux.org/apps/agl-service-hvac/tree/hvac.json

change information here https://git.automotivelinux.org/AGL/meta-agl-demo/tree/recipes-config/dev-mapping-demo/dev-mapping-demo/dev-mapping.conf.demo

As I see in dev-mapping there is a " RPROVIDES_${PN} = "virtual/low-can-dev-mapping" and in agl-service-can-low-level there is a "RDEPENDS_${PN} = "virtual/low-can-dev–mapping" but in the further services/apps  there is no "RDEPENDS_${PN}"

My idea was now to add in dev-mapping a section that copies my service in the system. Like in the example that you mentioned.

Is it stupid to change that files locally or do I have to fork that repos and then change the paths in the different systems?