Sending/streaming with usrp 2944/x310

Question

I am trying to send with a usrp 2944/x310 and I somehow trying to make it time relevant, like it sends at 200Mhz for 2 Seconds/2 pulses and afterwards goes to 220 Mhz so the whole process depends on the puls per second, because i have another usrp 2944 programmed to receive all this, but the sending code is not working probably unfortunately:( it usually just send the num_of_samples and start spaming LLLLL or underflows, till the next puls comes and so on, is there a way to control this in a better way? I am using streamCMD( start_cont) And metafata Thanks in advance 🙏🏻

I tried changing the sample rate and number of samples, so it’s exactly 2 seconds or something but that’s not okay for me, I just really want it to wait for puls and just stay sendinh for one puls and sleep for 1 and then send again with the next pulse and so on