Lately i'm interested in wifi so i buy Airdrop-A(ATMEGA128) from www.edtp.com.I tried to interface it with spi and it works fine.I'm using visual basic 6 to connect to airdrop-A trough TCP. After PC initiate SYN and three way handshaking are done the Airdrop-A start to transmit data and it works fine. But after about 40 sec idle and i want to transmit data again, it seems i can't send the data again! Did somebody know the problem? Is it because TCP specification or not?