Merge branch 'IntoPa-usrp_additions' into next

docs/CHANGELOG.md

@@ -78,6 +78,9 @@ All notable changes to GNSS-SDR will be documented in this file.
   `Osmosdr_Signal_Source` implementation of a `SignalSource`.
 - The `Osmosdr_Signal_Source` implementation learned a new parameter `if_bw` to
   manually set the bandwidth of the bandpass filter on the radio frontend.
+- The `UHD_Signal_Source` learned two new optional parameters
+  `device_recv_frame_size` and `device_num_recv_frames` for overriding
+  [transport layer defaults](https://files.ettus.com/manual/page_transport.html).
 - The new configuration parameter `Channels_XX.RF_channel_ID` allows to specify
   the signal source per channel group.
 - Allowed the CMake project to be a sub-project.

src/algorithms/signal_source/adapters/uhd_signal_source.cc

@@ -65,6 +65,20 @@ UhdSignalSource::UhdSignalSource(const ConfigurationInterface* configuration,
     sample_rate_ = configuration->property(role + ".sampling_frequency", 4.0e6);
     item_type_ = configuration->property(role + ".item_type", default_item_type);
 
+    // UHD TRANSPORT PARAMETERS
+    // option to manually set device "num_recv_frames"
+    std::string device_num_recv_frames = configuration->property(role + ".device_num_recv_frames", empty);
+    if (empty != device_num_recv_frames)  // if not empty
+        {
+            dev_addr["num_recv_frames"] = device_num_recv_frames;
+        }
+    // option to manually set device "recv_frame_size"
+    std::string device_recv_frame_size = configuration->property(role + ".device_recv_frame_size", empty);
+    if (empty != device_recv_frame_size)  // if not empty
+        {
+            dev_addr["recv_frame_size"] = device_recv_frame_size;
+        }
+
     if (RF_channels_ == 1)
         {
             // Single RF channel UHD operation (backward compatible config file format)