Caputering DLC2 ppp-data in CMUX TS27.010?

I’m attempting to debug a TCP/IP issue and am looking for a way of capturing dlc2-data in the TS27.010 CMUX. Is there any tooling available (e.g. Wireshark plugin) or a simple C code which I can use to extract the ppp-data stream. Thanks for getting me on track!