warning and ssl error when make modules_install

[litaoxyz]

make -C /lib/modules/5.3.0-28-generic/build M=/home/xyz/candemo/can-isotp modules_install
make[1]: Entering directory '/usr/src/linux-headers-5.3.0-28-generic'
INSTALL /home/xyz/candemo/can-isotp/net/can/can-isotp.ko
At main.c:160:

• SSL error:02001002:system library:fopen:No such file or directory: ../crypto/bio/bss_file.c:72
• SSL error:2006D080:BIO routines:BIO_new_file:no such file: ../crypto/bio/bss_file.c:79
  sign-file: certs/signing_key.pem: No such file or directory
  DEPMOD 5.3.0-28-generic
  Warning: modules_install: missing 'System.map' file. Skipping depmod.
  make[1]: Leaving directory '/usr/src/linux-headers-5.3.0-28-generic'

similiar to #15 (comment)
I can receive first frame, I can't receive consecutive frames over isotp. Anyone could help to fix it?

[hartkopp]

Sorry but you are mixing two topics here:

1. Problems with installing the can-isotp module together with signed kernels
2. General usage of isotp user space tools

The first on has been handled here #20 (comment)

And the second one has been discussed here, where you also commented something: #15 (comment)

So I'll close this issue and re-open #15 to answer your question there ...