I imagine, that I don't need an interaction for custom logic on the FPGA. Maybe I need it later, but in a first step I try to bypass it. So I when I click on the Play Button in GNURadio all control tasks (in the test1_impl.cc) are consecutively processed and the last task is getting the GPS time (from the board) and writing it out to the PC (in a file). This the timestamp.
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