Recently active topics in Tibbo tagged with uart

Hi there again,
we are pushing some data (about 100bytes at a time) though serial port with 38 400 bps., then we forward it over UDP broadcast. Time to send 100bytes at this speed is about 30ms. So, when sending every 50-60ms, everything goes ok, no data loss occurs. But then sending every 30-35ms, with uart flow control enabled and in full-duplex mode, something strange happen: after a while, when flow control needs to be used (probably due to buffer filling), data sent through uart is constantly repeated and no new data is beeing received. It just keeps sending the same data on and on.
I can't find any reason why this is happening.
thanks in advance
chris