showimage could not deserialize message when cam2image interrupted about demos

[Karsten1987]

I can reproduce this behavior on OSX as well.

[Karsten1987]

It's essentially failing here in rosidl_typesupport_connext_cpp/resource/msg__type_support.cpp.em

  if (@(spec.base_type.type)_Plugin_deserialize_from_cdr_buffer(
      dds_message,
      cdr_stream->buffer,
      static_cast<unsigned int>(cdr_stream->buffer_length)) != RTI_TRUE)
  {
    fprintf(stderr, "deserialize from cdr buffer failed\n");
    return false;
  }

I am not sure if this is a real bug in connext or not (the API is not part of rmw_connext_cpp). I believe this might be some race condition where a callback is triggered but no data is delivered with it. Do you except some better exception handling?

[dirk-thomas]

Addressed by ros2/rmw_connext#297.