Came back with new issue, i was using iperf utility to test the performance of wifi and the bandwidth it takes to transmit certain amount of data over a interval of 10sec. issue is i was capturing iperf data in csv format so that i can read back the data and process for my further operation based on data. this error is coming in client side which is interacting over minicom terminal to server(PC in my case). following are the commands i passed
client: $ iperf -c <server ip-address> -y C > sample.txt
client: $ vi sample.txt
<dateandtime>,<clientip>,<clientport>,<serverip>,<serverport>,<ID>,<Duration>,<Interval>,<Bandwith><- this bandwidth is zero( '0' ).
normally when i send without csv i'm getting proper value even bandwidth also. if anyone know any idea on this please feel to share i will be glad