CAN.checkReceive()

#include <CANBus.h>
unsigned char len = 0;
unsigned char buf[8];
 
void setup() {
    Serial.begin(115200);
    CAN.begin(CAN_500KBPS);
}
 
void loop() {
    if(CAN_MSGAVAIL == CAN.checkReceive())            // Check to see whether data is received.
    {
        CAN.readMsgBuf(&len, buf);    // Read data
 
        for(int i = 0; i<len; i++)    // Output data value
        {
            Serial.print(buf[i]);Serial.print("\t");
        }
        Serial.println();
    }
}