A PDU is a special type of PMT pair object that consists of a PMT Dictionary (of metadata) and a PMT Uniform Vector (of data). This is defined as such to make operating on PDU type data somewhat standardized.
Depending on what you are actually trying to do you have a few options. If the string is metadata you can add it to the PMT metadata dictionary; if the string _is_ the data, you can save the encoded text values as a U8 uniform vector.
Jacob
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On Thursday, February 3rd, 2022 at 2:28 AM, Marcin Puchlik via "GNU Radio, the Free & Open-Source Toolkit for Software Radio" <discuss-gnuradio@gnu.org> wrote:
Hi Community,
Does the cdr part of the PDU has to be a PMT uniform vector? What if I want to fill the cdr with string type of data?