We are using a gps tracking application.In each 4 second the device longitude and latitudes will change.For load testing we used jmeter and the parameter are passed through csv file.CSV file have field like tripid,deviceid, latitude,longitude... so need to change the latitude,longitude values in each 4 seconds.
So we are keeping data in different csv files.But i dont know how to call csv file one by one in a single thread group.Under the Thread group used TCP sample.