Hi all: About uip0.9,My application is transmiting rs232 datas to tcp/ip. Only when "(uip_flags&UIP_ACKDATA)>0",uip_poll() can be used for sending data without having to wait for the remote host to send data.But when the remote host sends uip0.9 datas,uip0.9 only send ack back to the romote host,uip_poll() can not be used for sending data without having to wait for the remote host to send datas. Who can help me about this.thanks a lot first!Wish to reply!