CAN modification

Could someone using CAN Bus review this modification: https://github.com/apache/nuttx/pull/15809 BR, Alan

Re: CAN modification

Hi, Thanks for the call. The change looks reasonable as far as I am concerned. It looks like it increases memory usage a little bit, but it's not dramatic. I dont know if we have policies regarding memory usage statistics. Micropython is quite strict about this. Someone should double-check