BT_ASSERT_PRE_DEV_NON_NULL(iterator, "Message iterator");
BT_ASSERT_PRE_DEV_NON_NULL(msgs, "Message array (output)");
BT_ASSERT_PRE_DEV_NON_NULL(user_count, "Message count (output)");
BT_ASSERT_PRE_DEV_NON_NULL(iterator, "Message iterator");
BT_ASSERT_PRE_DEV_NON_NULL(msgs, "Message array (output)");
BT_ASSERT_PRE_DEV_NON_NULL(user_count, "Message count (output)");