I’m using this code as an example but I’m trying to wait for a certain id to pop up then send my own right after it.
heres the code I’m using but I’m not getting any output when I send the can frames to test it.
candump can0 | grep " 123 " | while read line; do cansend can0 456#12345678; done
@dubb45, I don’t see your code … can you add it in so we can take a look?
In the meantime, I assume you are running candump / cansend on some form of unix machine. I also assume you are using a Carloop to do the USB/CANbus interface between your unix machine and the car.
Can you do some checks to ensure your unix machine and Carloop are communicating properly with each other? I would suggest having the Carloop echo back messages to the unix machine so you can check if Carloop is seeing the cansend correctly?
I have proper communication between my raspberry pi and the carloop working fine, I’m able to send commands no problem and it works. what I’m trying to do is wait for a certain ID to pop up then send my own ID right after.
I assumed from using the command (not code sorry) below it would read the ID then send my command. I haven’t got to make it into full blown code just yet still trying to get it working. I have made it work once but now can’t get it working again I’m assuming I did something by mistake I’m looking over. candump can0 | grep " 123 " | while read line; do cansend can0 456#8021C0071B101000; done
I got it to work with this line but got a few errors candump can0 | grep "123" while read line; cansend can0 123#1234 grep: while: No such file or directory grep: read: No such file or directory grep: line: No such file or directory
but once the command reads the ID once it quits. if I pull up one terminal with “candump” and another one to run the code, I can see it see the original ID then send the custom ID, after that it closes the command, almost there to figuring it out.
appreciate it ill keep at it, I just got the 8.4" uconnect screen upgrading from, the 4.3" screen in my Dodge Charger. now looking into a way for video input but a DIY way lol id rather not pay a ton just to get my raspberry pi to display on the screen lol I have it setup as a hotspot now and can connect to it via phone, laptop, iPad etc. to candump and it works great too. eventually I want to make my own interface once I get all the commands down packed.