LibOSDP has a lot of debugging/diagnostics built into it to help narrow down the issue without having to exchange a bunch of emails/comments with each user who encounters an issue. This save developer time at both ends. That said, the default logging methods are very sane which makes this unnecessary for every issue. So don’t trouble yourself to generate such logs proactively.

A note on the log file

It is preferable to attach the full logs (from osdp_cp_setup() to point of failure). If you feel that you know what the issue is or that the entire log wont help, please feel free to snip them as you see fit, but please try to retain the very first few log lines as it has some info on which version of LibOSDP you are running and you PD connection topology.

When creating an issue in GitHub, it is not very elegant to post the entire log file in the issue description so it is better to attached the log file to the issue or post it in some log sharing websites such as and include the link in the issue.

Log Level

LibOSDP supports different logging levels with LOG_DEBUG being the most verbose mode. When asking for help, please set the log level to LOG_DEBUG.

This can be done by calling osdp_logger_init() BEFORE calling osdp_cp/pd_setup() as,

osdp_logger_init(LOG_DEBUG, printf);

Packet Trace Builds

This is the most verbose form of debugging where all bytes on the wire are logged as LibOSDP saw them. This can come in handy when trying to debug low level issues.

To enable packet trace builds, follow these steps:

mkdir build-pt && cd build-pt

Data Trace Builds

When secure channel is working fine and you are encountering a command level failure, it can be helpful to see the decrypted messages instead of the junk that would get dumped when secure channel is enabled.

To enable data trace builds, follow these steps:

mkdir build-dt && cd build-dt

Note: It is seldom useful to run on both packet trace AND data trace (in fact it makes it harder to locate relevant information) so please never do it.