Streaming support for NI Drivers

Currently, there are APIs in DAQMx and FPGA that support streaming functionality.

Ideally, Read and Write APIs supports streaming. Here are a few examples of streaming APIs:

DAQ:

• BeginReadBinaryU16
• BeginWriteAnalogF64
• BeginReadPowerBinaryI16

FPGA:

• BeginReadArrayI64
• BeginWriteArrayI8
• BeginReadI32

Check DAQMx and FPGA proto file to see full list of APIs supporting streaming. Streaming APIs have Begin as a prefix followed by the C API name.

Currently, we do not receive any response after calling the Write streaming APIs. However, for Read streaming APIs, we receive a response as part of PackedData. The response looks something like:

message BeginReadArrayI16Response { int32 status = 1; ni.data_monikers.Moniker moniker = 2; }

where status is the result of the API call and moniker is the structure passed in streaming API.

Types of streaming:

StreamRead, StreamWrite, and StreamReadWrite: These all use gRPC streaming to function.

BeginSidebandStream: This uses sideband streaming, which internally utilizes raw sockets for communication.

Check out how to setup a client for streaming here.