As I understand it the steering angle sensor is one of the inputs to determine how much torque is applied by the DPS. It's probably one of the inputs into the VSS to automatically limit speed and braking in a sharp turn.
To use BUSMASTER is anything else needed other than the s/w loaded on the computer? Of course BUDS is needed.
Yes, steering sensor is a must for ESC (electronic stability control) but I'm not sure for what exact purpose. ESC is not limiting engine torque and yaw rate and XY acceleration is used from another sensor. There is a document publicly available for Bosch M4 abs describing how whole system works and what data is used. You could basically buy this kit for 6k usd and have esc+abs on a bicycle

. Once I will start messing with can bus and test my spyder on wet surface then we will see what is happening when.
BUDS is not required, in fact it's best to not use buds during logging because BUDS is communicating with spyder and traffic will be harder to decipher. IXXAT (MPI3) device needs to be connected but instead of BUDS you should open busmaster. If you have win10 there is dll with current drivers to allow getting data from ixxat (MPI3) (
https://github.com/rbei-etas/busmaster/issues/1191). BUDS is using IXXAT VCI 4 drivers on windows 10 because ixxat (mpi3) is not working with vci 3 drivers on widows 10. Sorry for using IXXAT instead of MPI - MPI is just a name and stickers on IXXAT USB to can V2 device
https://www.picclickimg.com/d/l400/pict/283427031345_/IXXAT-USB-to-CAN-V2-Compact-Interface-USB.jpg.
So, MPI3 + busmaster (on win10 dll with proper drivers in busmaster folder). That is all. Off course key on and logging on busmaster enabled with file as output. Activate for logging will be enabled when you configure logging (just tick checkbox that logging goes to file).
This for example is only ECU transmission without anything other connected.
Some messages are static, some change a little, most of them have counters as byte 6 or 7. Busmaster will write something like this:
17:31:34:1476 Rx 1 0x120 s 8 00 00 53 41 96 00 01 85
17:31:34:1479 Rx 1 0x300 s 8 00 00 FF FF 00 00 00 00
17:31:34:1481 Rx 1 0x308 s 8 40 80 00 00 00 00 00 00
17:31:34:1484 Rx 1 0x342 s 8 58 2D 00 00 7D 00 00 00
17:31:34:1486 Rx 1 0x516 s 8 02 01 81 01 00 00 00 01
17:31:34:1489 Rx 1 0x102 s 8 00 00 15 3E 3F C8 01 DD
17:31:34:1491 Rx 1 0x103 s 8 00 00 00 00 00 00 01 01
17:31:34:1494 Rx 1 0x310 s 8 87 00 00 00 00 00 01 86
17:31:34:1496 Rx 1 0x120 s 8 00 A5 53 41 96 00 02 23
17:31:34:1498 Rx 1 0x300 s 8 00 00 FF FF 00 00 00 00
17:31:34:1501 Rx 1 0x308 s 8 40 80 00 08 00 00 00 00
17:31:34:1503 Rx 1 0x342 s 8 58 2D 00 00 7D 00 00 00
17:31:34:1506 Rx 1 0x516 s 8 02 01 81 01 00 00 00 01
17:31:34:1586 Rx 1 0x102 s 8 00 00 15 3E 3F C8 02 DE
17:31:34:1589 Rx 1 0x103 s 8 00 00 00 00 00 00 02 02
17:31:34:1591 Rx 1 0x310 s 8 87 00 00 00 00 00 02 85
17:31:34:1686 Rx 1 0x102 s 8 00 00 15 3E 3F C8 03 DF
17:31:34:1688 Rx 1 0x103 s 8 00 00 00 00 00 00 03 03
17:31:34:1691 Rx 1 0x310 s 8 87 00 00 00 00 00 03 84
17:31:34:1693 Rx 1 0x120 s 8 20 A5 53 41 96 00 03 02
17:31:34:1696 Rx 1 0x300 s 8 00 00 FF FF 00 00 00 00
17:31:34:1698 Rx 1 0x308 s 8 40 80 00 08 00 00 00 00
17:31:34:1701 Rx 1 0x342 s 8 58 2D 00 00 7C 00 00 00
17:31:34:1703 Rx 1 0x516 s 8 02 01 81 01 00 00 00 01
17:31:34:1786 Rx 1 0x102 s 8 00 00 15 3E 3F C8 04 D8
17:31:34:1789 Rx 1 0x103 s 8 00 00 00 00 00 00 04 04
17:31:34:1791 Rx 1 0x310 s 8 87 00 00 00 00 00 04 83
17:31:34:1886 Rx 1 0x102 s 8 00 00 1A 3E 3F C8 05 D6
17:31:34:1888 Rx 1 0x103 s 8 00 00 00 00 00 00 05 05
17:31:34:1890 Rx 1 0x310 s 8 87 00 00 00 00 00 05 82
17:31:34:1894 Rx 1 0x120 s 8 20 A5 53 41 96 00 04 05
17:31:34:1896 Rx 1 0x300 s 8 00 00 FF FF 00 00 00 00
17:31:34:1899 Rx 1 0x308 s 8 40 80 00 08 00 00 00 00
17:31:34:1901 Rx 1 0x342 s 8 58 2D C3 03 7A 00 00 00
17:31:34:1903 Rx 1 0x516 s 8 02 01 81 01 00 00 00 01
17:31:34:1986 Rx 1 0x102 s 8 00 00 34 3E 3F C8 06 FB
17:31:34:1988 Rx 1 0x103 s 8 00 00 00 00 00 00 06 06
17:31:34:1991 Rx 1 0x310 s 8 87 00 00 00 00 00 06 81
17:31:34:2086 Rx 1 0x102 s 8 00 00 4F 3E 3F C8 07 81
17:31:34:2088 Rx 1 0x103 s 8 00 00 00 00 00 00 07 07
17:31:34:2091 Rx 1 0x310 s 8 87 00 00 00 00 00 07 80
17:31:34:2093 Rx 1 0x120 s 8 20 A5 83 41 96 00 05 D4
17:31:34:2096 Rx 1 0x300 s 8 00 00 FF FF 00 00 00 00
17:31:34:2098 Rx 1 0x308 s 8 40 80 00 08 00 00 00 00
17:31:34:2101 Rx 1 0x342 s 8 58 2D C3 03 7C 00 00 00
17:31:34:2103 Rx 1 0x516 s 8 02 01 81 01 00 00 00 01
17:31:34:2186 Rx 1 0x102 s 8 00 00 5D 3E 3F C8 08 9C
17:31:34:2188 Rx 1 0x103 s 8 00 00 00 00 00 00 08 08
17:31:34:2191 Rx 1 0x310 s 8 87 00 00 00 00 00 08 8F
17:31:34:2286 Rx 1 0x102 s 8 00 00 63 3E 3F C8 09 A3
17:31:34:2288 Rx 1 0x103 s 8 00 00 00 00 00 00 09 09
17:31:34:2290 Rx 1 0x310 s 8 07 00 00 00 00 00 09 0E
17:31:34:2294 Rx 1 0x120 s 8 20 A5 83 41 96 00 06 D7
17:31:34:2296 Rx 1 0x300 s 8 00 00 FF FF 00 00 00 00