If the file is a .csv file as you said in your other post, then you should just be able to use Read From Spreadsheet File, making sure to set the delimiter to comma rather than tab. If it's a small file, you can just read in the whole thing, then use a loop with a Wait For Millisecond Multiple node (the metronome) to send the data once every second.
If the file is very large, and you don't want to read it all at once, you can tell the Read From Spreadsheet File node to read only one line at a time. Put the read node and the data sending node in the same While loop, and use a shift register to carry the Mark After Read value from one iteration into the Offset or Mark At Start terminal in the next iteration. That way, you start reading each line at the end of the previous one. Use some form of flow control (such as a Stacked Sequence Structure) to make sure things happen in the right order - read data, wait for the right time, send data.
