Generate certificates.h for Portenta H7 in order to connect to websites that use SSL

get_certificate.sh

if [ -z "$1" ];
        then echo "execute ./get_certificate.sh <domain_name>";
else
  openssl s_client -showcerts -connect ["$1"]:443 </dev/null | sed -n -e '/-.BEGIN/,/-.END/ p' > certifs.pem
  xxd -i certifs.pem </dev/null | sed -e 's/unsigned char .* = {/const unsigned char cacert_pem[] = {/g' -e 's/unsigned int .* = .*;//g' > certificates.h
  echo "unsigned int cacert_pem_len = sizeof(cacert_pem);" >> certificates.h
  rm certifs.pem
  echo "Done, check certificates.h!"
fi