Sending data to realdash using MCP2515

Hi everyone,
I’m struggling sending CAN data to Realdash.
My realdash setup consist of an Android tab and a CAN to USB converter.

I have an arduino with an MCP2515 an want to send data to realdash using CANbus.

The problem is the “44” frame. I struggle sending an 8byte header. From what I understand, thats not standard. Is it really possible to send an 8 byte header ?

I tried creating a custom XML file with one data in order to test my setup and it works, but I want to use the default XML files of course…

Thanks for any help

Can you share a sketch, and which library is being used?

I use that lib : mcp_can - Arduino Reference

And here is the code:
This is the function:
void sendCANMsg(uint8_t header[8], uint8_t data[8]) {
mcp.sendMsgBuf(header, 0, 8, data);

And the function call:
uint8_t header[8] = { 0x44, 0x33, 0x22, 0x11, 0x00, 0x00, 0x00, 0xa4 }; //brakes
uint8_t dataFrame[8] = { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 };
sendCANMsg(header, dataFrame);