Comments (4)
Looks like as a quick fix, patching the ISOTP module locally to mask off the J1939 priority bits works, and we'll look into a kernel upgrade. Thanks again for your help!
from can-isotp.
This reference from Annex A is a J1939 addressing topic - you can check for the CAN_J1939 protocol inside the kernel, see priority handling here:
https://github.com/torvalds/linux/blob/master/net/can/j1939/main.c#L330
The native ISO15765-2 protocol is a point-to-point transport protocol on two single CAN Identifiers, not to a bunch of CAN IDs.
from can-isotp.
Thanks for the quick reply! I did not know there was J1939 support within the kernel. I'm not sure we can use it on our old kernel (3.18) but I'll look into it.
from can-isotp.
You should really try to upgrade your 3.18 (Android??) kernel!
The J1939 implementation had several implementation and integration steps until it was upstreamed for the mainline kernel.
So it could be that you find an older version, which probably fits into the 3.18, but which might have an outdated user-space socket API.
from can-isotp.
Related Issues (20)
- use read() function and add notify function. HOT 18
- ERRNO 84 on recv() HOT 2
- FlowControl: isotp vs. "real" OBD2 adapter behavior HOT 4
- how to send > 4095 isotp message HOT 3
- wait_tx_done does not seem to be working [RPi + python-can-isotp] HOT 31
- MAX_MSG_LENGTH to 66000 commit is missing from this repo HOT 1
- When trying to read 8K messages on ISO-TP socket using Classic CAN receive back -1 with errno 110 ETIMEDOUT HOT 5
- FlowControl frame address tx_id vs. rx_id - 8? HOT 2
- Unrecoverable error when using python socket with CAN_ISOTP. HOT 8
- Sending rate cannot be faster than 300us HOT 12
- unstable transmission of data: sequence number of consecutive frames get messed up HOT 3
- MSG_CMSG_COMPAT set by the kernel for `recvmsg` HOT 7
- Compiling of branch mainline-5.4+ HOT 2
- IP over CAN ISO-TP multi-host HOT 2
- Address extension in one direction but not the other HOT 2
- read: Network is down HOT 2
- missing feedback on expired timer for first flow control (FC) frame HOT 2
- best way to programatically test if the module is installed? HOT 6
- make fails and I can't figure out why. Hoping someone can help out HOT 3
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