Bug report

Required Info:

• Operating System:
  • Ubuntu 20.04
• Installation type:
  • Binaries
• Version or commit hash:
  • ros-foxy-rclcpp/focal,now 2.4.0-1focal.20211014.182342 amd64
• DDS implementation:
  • Fast-RTPS
• Client library (if applicable):
  • rclcpp

Steps to reproduce issue

Create a message type (StringLengthTest.msg) with size limited string field:

string<=10 size_limited_string

Publish a message with a lengthier string:

auto node = std::make_shared<rclcpp::Node>("string_length_test_publisher");
auto publisher = node->create_publisher<msg_tester_interfaces::msg::StringLengthTest>("oversized", 10);
auto message = msg_tester_interfaces::msg::StringLengthTest();
message.size_limited_string.resize(20, '.');
publisher->publish(message);
rclcpp::spin_some(node);

Expected behavior

Exception of type std::length_error.

Actual behavior

Message is published and received in full by an rclcpp subscriber, i.e., no error and no truncation.

Side note: an rclpy subscriber does throw an error:

AssertionError: The 'size_limited_string' field must be string value not longer than 10