Can Bus question about messages

[caslor]

Hi to all friends
i want to start a project that will use Can Bus for communication between a raspberry pi zero and an Arduino Nano ( At my first steps will use just only to Arduino Nano to communicate each other that would be more easy i think and later will try to make it work and with raspberry)

so my hardware will be
2 Arduino Nanos
2 mcp2515 can bus modules

for library i will use this one :

GitHub - autowp/arduino-mcp2515: Arduino MCP2515 CAN interface library

My Question :

As i have understand until now from the examples and the articles i have read is that every time you send a message first is the Can id (device id) and second the Can dlc (data length) and then the data
something like this :

 canMsg1.can_id  = 0x0F6;
  canMsg1.can_dlc = 8;
  canMsg1.data[0] = 0x8E;
  canMsg1.data[1] = 0x87;
  canMsg1.data[2] = 0x32;
  canMsg1.data[3] = 0xFA;
  canMsg1.data[4] = 0x26;
  canMsg1.data[5] = 0x8E;
  canMsg1.data[6] = 0xBE;
  canMsg1.data[7] = 0x86;

So if i want to sent in one message the state of 8 pins if there are low or high can i use each data position for that? and if i want to send 8 more I/O pins state have to use a second Message like :
canMsg2.can_id = 0x05F;

or should i use for each I/O pin state a new message ?

thanks in advance

[horace]

the CAN message is a maximum of 8 bytes (each 8 bits)
if you wish to transmit the state of 8pins (1 or 0) use a single byte where each of 8 bits represents a pin

[caslor]

Thanks you clear my path how to organize my future project

so if i need to transmit the state of 16 pins will brake them to 2 unique messages etc

thanks