Function osdp_set_log_callback 

pub unsafe extern "C" fn osdp_set_log_callback(
    cb: osdp_log_callback_fn_t,
)

@brief A callback function that gets called when LibOSDP wants to emit a log line. All messages (of all log levels) are passed on to this callback without any log formatting. This API is for users who may already have a logger configured in their application.

@param cb The callback function. See osdp_log_callback_fn_t for more details.

@note This function has to be called before osdp_{cp,pd}_setup(). Otherwise it will be ignored.