I am trying to communicate with a head unit in my car that supports the apple accessory protocol.
From reading the information from the link.
I understand that the first 2 bytes of the request should be FF 55.
What is coming from my head unit at baud rate 57600 is:
ff 55 13 11 ce
However this is too short, as the request should be at least 7 bytes. At baud rate 19200:
ff e1 20 02 02 02
This again is too short. At any baud rate i cant get the right length of request, or the write start to the request.
I have connected an Ipod and it works perfectly.
Ive been collecting the data using a raspberry pi & minicom, then reading the data as hex using hexdump or od.
Any ideas what is wrong or what I am doing wrong?