i use a "Live on the Bleeding Edge" Version
https://www.wireshark.org/download/automated/win64/Wireshark-win64-2.3.0-128-g98e8b26.exe
Sample Modbus-Exception-Code Response:
00 00 00 00 00 03 00 88 01
Modbus/TCP
Transaction Identifier: 0
Protocol Identifier: 0
Length: 3
Unit Identifier: 0
Function 8: Diagnostics. Exception: Illegal function
Function Code: Unknown (136) <-- !! the execption bit does not get
masked here !! (136 & 0x7F) == 8
Exception Code: Illegal function (1)
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