Hello,

I'm trying to use the set_start_time() command on a RFNoC: Radio block with
a USRP X300. I am using the syntax to try to set the start time:
self.uhd_rfnoc_streamer_radio_0.set_time_next_pps(uhd.time_spec(0));
self.uhd_rfnoc_streamer_radio_0.set_start_time(uhd.time_spec(15));

However, the radio begins transmitting immediately after running the script
instead of waiting for 15 seconds. Additionally, I know that there is no
start time set in any of the packets sent to the radio, confirmed using a
packet sniffer (wireshark).

I am trying to understand where the error in this setup is. Am I not using
the correct syntax to set the start time, or are there some features that
are not yet fully supported with RFNoC in GNU Radio? For reference, I am
using version 3.7.12, which was installed with the rfnoc recipe in pybombs.

Thanks,

~Reggie
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