check out my circuit.. it worked for me.
**broken link removed**
If you do implement a softUART I would suggest keeping the BAUD rate at 9600 or lower, actually 4800 usually works well with a MCU like the AVR.
it wont be a robust solution.. it would be bettre to use soft uart or just use a micro with 2 uarts. Relays would get damaged after some time . further more it will produce lot of noise in the circuit. Using 2 usarts wont waste the data as well.
its very simple, you can do it by using relays, it worked for me.
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