wireshark-goodix

Wireshark protocol dissector for the SPI protocol of the GXFP5187.

SPI packets are to be provided as fake UDP packets on Port 1, since I don't think pcap has a SPI linktype.

goodix_message.lua describes the interesting packet information. goodix_v2.lua is an encapsulation format that specifies whether or not the packet is encrypted with TLS. Decrypted data is then fed back in to the goodix_message dissector.

Sample SPI data is available in sample_data.pcap

Usage

Drop both .lua files in ~/.local/lib/wireshark/plugins (or another plugin directory)

For USB, right click a packet and select "Decode As...", then select GOODIX from the dropdown

Decryption

Enter your 48-byte PSK (as 96 bytes of hex) in Edit -> Preferences -> Protocols -> TLS -> Pre-Shared-Key

Wireshark may complain in the TLS Application Data packet dissection that the packet length exceeds the maximum from the spec -- this appears to not matter, the data all decrypts correctly anyway.