thanks for confirming my assumptions.

i looked at a bunch more 8192 baud aldl stuff today and couldn't find any different length bytes.

byte 2 of any aldl data = length of message + 0x52

... that was three things. you can tell how horrible at math i am.

through a bit of raw searching, i'm guessing that the 'message length' field (the second byte of practically any aldl communication that tells the ecm how long the message will be) is calculated as...