Le ven. 11 juin 2021 à 08:57, Kurt Van Dijck <dev.kurt@xxxxxxxxxxxxxxxxxxxxxx> a écrit : > > On Fri, 11 Jun 2021 06:12:32 +0200, Oleksij Rempel wrote: > > Hi Rémy, > > > > On Tue, Jun 08, 2021 at 05:27:45PM +0200, Rémy DZIEMIASZKO wrote: > > > Hello, > > > > > > I need that my applications do not care about J1939 node addresses but > > > directly bind / connect to socket based on node name only and the > > > kernel takes care of the conversion to addresses. > > > > > > I know this is possible if addresses are dynamically assigned through > > > the Address Claiming protocol that is implemented in the kernel. The > > > kernel keeps track of its own address and name as well as the > > > addresses and names of other ECUs on the network and convert name to > > > adresse when requested by the applications. > > > > > > But I don't want to use the Address Claiming protocol. I want to > > > statically set all addresses and names. > > It is supported to not use Address Claiming. > > > > > > > Is there a way to assign J1939 addresses and names to a CAN interface > > > without using the J1939 address claim protocol? > > > > Current version do not have this functionality. > > If you bind() your socket with only sockaddr_can.j1939.sa set to your > SA, and sockaddr_can.j1939.name to 0, makes your socket use your SA as > static address. > > > > > > I found in old j1939 kernel documentation something like > > > ip addr add dev canX j1939 0xXX > > > ip addr add dev canX j1939 name 0xXX > > > See https://www.spinics.net/lists/netdev/msg162350.html > > > > > > But in the latest j1939 kernel documentation I do not find any > > > reference to these commands. > > > > Yes, it was pre mainline version. For mainlining we reduced UAPI to the > > minimum to simplify reviewing, mainlining and testing process. > > > > The strict addressing was rejected because it felt much heavier than > what most CAN users were used to. Moving to the current ad-hoc > implementation allowed to drop quite some kernel code too. > Hi Kurt, When I develop my application I don't know it's source address. I only know its name. In the future my application shall be integrated in different projects/vehicules. For each project, the source_address may be different but the name will never change. I don't want to adapt the source code of the application for each project so I don't want to bind/connect to source_addresses but to names. That's why it would be nice if the platform / the kernel does the translation name --> source_address.
