log error message if param type is unexpected

Author: lreiher

mqtt_client/include/mqtt_client/MqttClient.h

@@ -455,9 +455,12 @@ template <typename T>
 bool MqttClient::loadParameter(const std::string& key, T& value,
                                const T& default_value) {
   bool found = private_node_handle_.param<T>(key, value, default_value);
-  if (!found)
+  if (!found) {
+    if (private_node_handle_.hasParam(key))
+      NODELET_ERROR("Parameter '%s' has wrong data type", key.c_str());
     NODELET_WARN("Parameter '%s' not set, defaulting to '%s'", key.c_str(),
                  std::to_string(default_value).c_str());
+  }
   if (found)
     NODELET_DEBUG("Retrieved parameter '%s' = '%s'", key.c_str(),
                   std::to_string(value).c_str());

mqtt_client/src/MqttClient.cpp

@@ -346,9 +346,12 @@ bool MqttClient::loadParameter(const std::string& key, std::string& value,
                                const std::string& default_value) {
   bool found =
     private_node_handle_.param<std::string>(key, value, default_value);
-  if (!found)
+  if (!found) {
+    if (private_node_handle_.hasParam(key))
+      NODELET_ERROR("Parameter '%s' has wrong data type", key.c_str());
     NODELET_WARN("Parameter '%s' not set, defaulting to '%s'", key.c_str(),
                  default_value.c_str());
+  }
   if (found)
     NODELET_DEBUG("Retrieved parameter '%s' = '%s'", key.c_str(),
                   value.c_str());