Reduced UHD send/recv buffer to reduce Late packets

srslte/lib/cuhd/src/cuhd_imp.cpp

@@ -162,7 +162,7 @@ int cuhd_open_(char *args, void **h, bool create_thread_gain, bool tx_gain_same_
 {
   cuhd_handler *handler = new cuhd_handler();
   std::string _args = std::string(args);
-  handler->usrp = uhd::usrp::multi_usrp::make(_args + ", master_clock_rate=30720000, num_recv_frames=64");
+  handler->usrp = uhd::usrp::multi_usrp::make(_args + ", master_clock_rate=30720000, num_recv_frames=64, num_send_frames=32");
 
 //  handler->usrp = uhd::usrp::multi_usrp::make(_args + ", master_clock_rate=50000000" + ", num_recv_frames=512");
   handler->usrp->set_clock_source("internal");