Add configurable log level as optional CLI argument

All three programs now accept an optional second argument [log-level]
(trace, debug, info, warning, error, fatal) defaulting to info. The
level is applied by setting the logger context pointer directly,
avoiding a memory leak that would occur from overwriting the
heap-allocated logger struct. Also documents the ASan leak-check
workflow in CLAUDE.md.

1 files changed, 15 insertions, 2 deletions

diff --git a/src/client_find_servers.c b/src/client_find_servers.c
index e50623f..a85b63f 100644
--- a/src/client_find_servers.c
+++ b/src/client_find_servers.c
@@ -211,10 +211,21 @@ readServerTime (UA_Client *client,
 int
 main (int argc, char **argv)
 {
-  if (argc != 2)
+  if (argc < 2 || argc > 3)
     {
       UA_LOG_FATAL (UA_Log_Stdout, UA_LOGCATEGORY_USERLAND,
-                    "Usage: %s <config-file>", argv[0]);
+                    "Usage: %s <config-file> [log-level]", argv[0]);
+      return EXIT_FAILURE;
+    }
+
+  const char *logLevelStr = (argc == 3) ? argv[2] : "info";
+  int logLevel = parseLogLevel (logLevelStr);
+  if (logLevel < 0)
+    {
+      UA_LOG_FATAL (UA_Log_Stdout, UA_LOGCATEGORY_USERLAND,
+                    "Unknown log level: %s "
+                    "(expected trace, debug, info, warning, error, fatal)",
+                    logLevelStr);
       return EXIT_FAILURE;
     }
 
@@ -302,6 +313,8 @@ main (int argc, char **argv)
       configFree (&cfg);
       return EXIT_FAILURE;
     }
+  UA_ClientConfig *clientConfig = UA_Client_getConfig (client);
+  clientConfig->logging->context = (void *)(uintptr_t)logLevel;
 
   UA_ApplicationDescription *applicationDescriptionArray = NULL;
   size_t applicationDescriptionArraySize = 0;