This tool can be used to generate various DOCSIS packets.
I use it mainly to generate packets for fuzz-testing of the Wireshark DOCSIS dissector and to test the quality of the dissector. It can be used for training purposes also. The packets generated are stored in a PCAP file format. It can be understood by Wireshark and tshark.
Field values are not trying to be Cablelabs compliant at all, at least at this stage.
Please use the GitHub system to report feature request and bugs.