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"TCP" tag

LabVIEW RT block diagram snippet: Use TCP to read current time from NIST time server, parse and validate the returned string, update the RT system time accordingly

Synchronize the system clock to a NIST time source
RT code

Synchronize the system clock time based on querying the Internet Time Service (ITS) maintained NIST (National Institute of Standards and Technology): Open a TCP/IP connection to the "Daytime Protocol" port 13, read the 51-character string, parse the string for time and date information, validate the result (look for a server health indicator and a "magic string"), and then adjust the system time.

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 icon and TCP network icon

RT networking: Transmission Control Protocol (TCP)
RT guide

TCP is a reliable connection-based IP networking protocol used between LabVIEW applications as well as other IoT devices.

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 block diagram snippet: Use TCP to read current time from NIST time server, parse and validate the returned string, update the RT system time accordingly

TCP/IP sender and receiver and "TCP ping" application
RT code PC code

Send TCP/IP messages to a destination IP address and port number, listen for incoming TCP/IP messages on a user-defined port, and echo received messages back to the source. Combine the sender and receiver into a single "TCP ping" application to test the communication channel between two network hosts, and illustrate the notifier method to stop parallel loops with one "stop" button.

LabVIEW RT block diagram snippet: Read the onboard accelerometer and pushbutton, convert to JSON string, and write to TCP channel

TCP client-server
RT code PC code

Create a server on the Academic RIO Device that listens for TCP/IP network connection requests from a client running on the PC host, accepts client information including the desired state of the four onboard LEDs, sets the LEDs accordingly, and returns the state of the onboard 3-axis accelerometer and pushbutton.