This code shows a condition where the gRPC Client VI hangs at "Wait for Occurrence" when being called from TestStand using the LabVIEW Run Time adapter.
More information on this issue can be found here: ni/grpc-labview#330
- LabVIEW 2021 SP1 f4 64-bit
- TestStand 2021 64-bit
- grpc-labview 1.0.1.1
The proto file which was used to generate both the server and client example is in the proto directory
To run the gRPC server for the example, a built x64 EXE is located at Server\builds\grpc_test_server.exe. One can also re-build the server from the LV project at Server\test_service.lvproj.
Both the gRPC client and TestStand sequence files are located in the Client directory.
The TestStand sequence Client\Call VI - No PPL.seq calls the gRPC Client VI which is not built in a PPL. This sequence can only be run using the LabVIEW Development Environment adapter, as the run time engine will be unable to find the required gRPC dependencies.
The TestStand sequence Client\Call VI - PPL.seq calls the gRPC Client VI which is built in a PPL and is used to show the hang. This sequence can be run using both the LabVIEW Development Environment adapter (which does not result in a hang) and the LabVIEW Run Time Engine adapter (which does result in a hang).