I agree with Farshid on the timestamping. About developping app/service, you will need:
1- Create a JSON file describing your signals and potentially some extra code if you need to use different decoder/encoder functions because the generic one aren't enough.
2- Create an app or service that would be the agl-service-can-low-level client and that will consume the needed event. If GPS signal's event comes from an other source than the low-can binding then I suggest you to use the signal composer binding(2) to gather multiple event sources and even create more high level signals starting from the low level event's source like the low-can binding and gps binding.
Regards.
Romain.
2:
https://docs.automotivelinux.org/docs/en/master/apis_services/reference/part-1/1-Architecture.html
[Edited Message Follows]
As Romain said, It is totally possible but I assume you will need to develop an AGL app/service with enhancing agl-service-can-low-level service. Timestamping is no big deal, you can get the time data from kernel or GPS. If I were you I will choose the GPS time since it is more precise and reliable.
-- Romain Forlot - Embedded Engineer - IoT.bzh romain.forlot@xxxxxxx - www.iot.bzh - +33675142438
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