How to add a carriage return to a buffer?

[JeanPascalDC]

Hi all, I'm looking for a way to add a carriage return [0xd] at the end of my buffer array but can't figure out how.

For reference, here is my string to carriage function

var payload = msg.payload
b = Buffer.from(msg.payload);

msg.payload=b;

return msg;

I Tried adding a \r to my payload string but unfortunately, it's not working