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RIO Developer Essentials Guide for Academia

"Web service" tag

Diagram showing communication pathway between PC host and RT target

RT/host inter-target communication
RT guide PC guide

Transfer data, commands, and status between the RT target and a host system.

LabVIEW RT block diagram: Attempt to open an HTTP connection to the Microsoft Network Connectivity Status Indicator (NCSI) web service as indicator of Internet access

Check Internet access (HTTP method)
RT code PC code

Determine whether or not Internet access is available by attempting an HTTP connection to the "Microsoft Network Connectivity Status Indicator" (NCSI) web service.

LabVIEW RT block diagram: Attempt to open a TCP connection to the Microsoft Network Connectivity Status Indicator (NCSI) web service as indicator of Internet access

Check Internet access (TCP method)
RT code PC code

Determine whether or not Internet access is available by attempting a TCP connection to the "Microsoft Network Connectivity Status Indicator" (NCSI) web service.

LabVIEW RT icon and globe icon

RT networking: Web services
RT guide

Use the infrastructure of the Web for machine-to-machine exchange of information.

Globe and binoculars icons

Web services overview
RT guide

A "Web service" uses the infrastructure of the Web for machine-to-machine exchange of specific information. The Academic RIO Device can call Web services to retrieve information and can also host Web services to provide information to other systems.

Globe and telephone handset icons

Web services: calling a Web service technical principles
RT guide

Learn the technical principles necessary to create VIs that can call Web services which return information in the form of JSON strings.

LabVIEW RT block diagram snippet: Call an API and parse the returned JSON string

Call a Web service
RT code

Form a query string as a URL, retrieve the JSON string served by the Web service, and parse the JSON string to extract useful information.

Globe and home icons

Web services: hosting a Web service technical principles
RT guide

Learn the technical principles necessary to host a Web service on the Academic RIO Device. Remote clients such as another LabVIEW-based target, an IoT device, or a conventional browser can retrieve sensor measurements and control indicators and actuators using commands obtained from the remote client's request query string.

LabVIEW RT block diagram snippet: Control onboard LEDs from web form data, return system date/time

Host a Web service
RT code

Host a web service on the Academic RIO Device to serve the states of onboard sensors (pushbutton and accelerometer) and system information (date, time, host name, and IP address), and to control the onboard LEDs based on a user-selected LED hex code.