Data Mismatch between CP and PD

[john1025]

Hi all,
I have one question about the data mismatch between CP and PD.

 From the communication shown in Wireshark, it seems that CP did send the bit which indicates CRC-16 for Integrity Check in packet no. 9, but PD always receive the bit which indicate "Checksum". Therefore, it always shows that "Invalid checksum" in PD side. May I know if there is any steps that I missed? Please kindly help to advise it. Thank you.

1. Wireshark pcap files:
   osdp-trace-cp-pd-1-2025-09-16T01_28_38Z.zip: pcap file in CP side.
   osdp-trace-pd-1-2025-09-16T01_28_36Z.zip: pcap file in PD side.

osdp-trace-cp-pd-1-2025-09-16T01_28_38Z.zip
osdp-trace-pd-1-2025-09-16T01_28_36Z.zip

2. Debug log when turning on OSDP_LOG_DEBUG in osdp_logger_init:
   cp_log.txt: log file in CP side.
   pd_log.txt: log file in PD side.

cp_log.txt
pd_log.txt

[sidcha]

@john1025, this is interesting. I see that the discrepancy between the reports twice and both times on the same bit. Do you have a logic analyzer that can capture the bytes independent of LibOSDP's capture infrastructure?

Also, is this bug reproducible? can you share the code that produced this capture?