i have one of those cheap mcp2515 can bus modules.
i followed directions on this page and got it to show up connected in signalk under the data provider i set up.
my module was a little different i cut the trace on the bottom of the board to separate the voltages.
https://vimtut0r.com/2017/01/17/can-bus-...nel-4-4-x/
screenshots 1 canbus connected, 2 settings in openplotter, 3 signalk data provider
i followed directions on this page and got it to show up connected in signalk under the data provider i set up.
my module was a little different i cut the trace on the bottom of the board to separate the voltages.
https://vimtut0r.com/2017/01/17/can-bus-...nel-4-4-x/
screenshots 1 canbus connected, 2 settings in openplotter, 3 signalk data provider