Waveform fails to connect to UHD_USRP device when launched in domain manager from IDE - redhawksdr

Question

I have created a waveform in the REDHAWKSDR IDE (Version 2.0.2) comprising a USRP_UHD device and a DataConverter. I followed carefully Section 7.2 "Associating a Waveform with an FEI Device" in the manual and used the "Use Frontend Tuner Device" artifact to define a device port and connection to the DataConverter. The port and connection render on the diagram. I saved the waveform and exported it to SDR.
I created a USRP node, added the UHD_USRP device to the node, and set the IP address. I can launch the node's DeviceManager, allocate the UHD_USRP frontend tuner manually, and confirm data flow on a NextMidas plot.
When I launch the waveform in the REDHAWK_DEV domain manager, the UHD_USRP device in waveform diagram is missing port and connection. The REDHAWK Explorer shows that the UHD_USRP device is allocated but the output port shows an unknown "Connection_1" and the DataConverter input port shows no connection. I recreated the connection manually using the "Connect" menu, but I get no data flow.
This basic USRP connection should be very simple, but I find no useful discussion in this forum or elsewhere. One observation: I can get the connection in python with the following commands:
from ossie.utils import sb
import frontend
sb.catalog(objType='devices')
usrp = sb.launch('rh.USRP_UHD')
usrp.target_device.ip_address = '192.168.10.2'
alloc = frontend.createTunerAllocation("RX_DIGITIZER",
allocation_id="testing", center_frequency=925.0e6, sample_rate=20.0e6, sample_rate_tolerance=20.0)
usrp.allocateCapacity(alloc)
alloc1 = frontend.createTunerListenerAllocation("testing", "listener1")
usrp.allocateCapacity(alloc1)
converter = sb.launch('rh.DataConverter')
converter.maxTransferSize = 262144
usrp.connect(converter, usesPortName="dataShort_out", providesPortName="dataShort", connectionId='listener1')
plot2 = sb.RasterPSD(nfft=8192, frameSize=8192)
converter.connect(plot2, usesPortName="dataFloat_out", providesPortName="FloatIn")
sb.start()

Answer 1

This answer is based on old notes so it may not work. We do most of our connections dynamically through python these days. I didn't have a USRP on hand to test with.
I generated a quick waveform the way you described and the following XML was generated in the .sad.xml file:
<connections>
<connectinterface id="connection_1">
<usesport>
<usesidentifier>dataShort_out</usesidentifier>
<deviceusedbyapplication usesrefid="rh.USRP_UHD_1"/>
</usesport>
<providesport>
<providesidentifier>dataShort</providesidentifier>
<componentinstantiationref refid="DataConverter_1"/>
</providesport>
</connectinterface>
</connections>
<usesdevicedependencies>
<usesdevice id="rh.USRP_UHD_1">
<propertyref refid="DCE:cdc5ee18-7ceb-4ae6-bf4c-31f983179b4d" value="FRONTEND::TUNER"/>
<propertyref refid="DCE:0f99b2e4-9903-4631-9846-ff349d18ecfb" value="USRP"/>
<structref refid="FRONTEND::tuner_allocation">
<simpleref refid="FRONTEND::tuner_allocation::tuner_type" value="RX_DIGITIZER"/>
<simpleref refid="FRONTEND::tuner_allocation::allocation_id" value="devuser:6e463f2c-fe8f-4997-98e9-39bf1364c861"/>
<simpleref refid="FRONTEND::tuner_allocation::center_frequency" value="9.0E8"/>
<simpleref refid="FRONTEND::tuner_allocation::bandwidth" value="0.0"/>
<simpleref refid="FRONTEND::tuner_allocation::bandwidth_tolerance" value="20.0"/>
<simpleref refid="FRONTEND::tuner_allocation::sample_rate" value="0.0"/>
<simpleref refid="FRONTEND::tuner_allocation::sample_rate_tolerance" value="20.0"/>
<simpleref refid="FRONTEND::tuner_allocation::device_control" value="true"/>
<simpleref refid="FRONTEND::tuner_allocation::group_id" value=""/>
<simpleref refid="FRONTEND::tuner_allocation::rf_flow_id" value=""/>
</structref>
</usesdevice>
</usesdevicedependencies>
The id in the connectinterface element used to be the same as the allocation_id of the device.
<connectinterface id="connection_1">
should be
<connectinterface id="devuser:6e463f2c-fe8f-4997-98e9-39bf1364c861">
in the generated code above instead of "connection_1". Replace the "devuser:6e463f2c-fe8f-4997-98e9-39bf1364c861" string with whatever was generated for your allocation.