Waveshare SN65HVD230 CAN Board Connecting MCUs to CAN Network Features ESD Protection Communication Evaluation Development Board 3.3V

That's not a jumper........those pins are to connect directly to CAN-H or CAN-L instead of using the screw terminals. Shorting them out will obviously short the two lines (which is not what you would want to do).

The termination resistor should be easy to disconnect, and it isn't (had to desolder it) - what looks like a jumper position is actually the secondary can bus output pins, do not fit a jumper here! Using on a car to hack the can messages, you do not want the 120 ohm resistor connected. Should be a jumper to enable and disable, hence 4 stars. BUT it works perfectly. Expensive on here compared to other online sources.

I couldn't get this to work with my system, this might be because of me but I'm not sure.

Works great!

Funciona muy bien.

Avevo acquistato un prodotto simile da un altro sito, non riuscivo a fare funzionare il mio esp32 con quel ricevitore CAN. Ho scoperto che ci sono molti prodotti contraffatti che non funzionano come devono. Ho comprato questo Waveshare che sicuramente costa di più, ma almeno avevo la garanzia di avere un prodotto di qualità! Non ha deluso e mi ha risparmiato parecchi problemi!!

Llego mucho antes de lo esperado. Todo excelente

Working great, and easy to use