does anyone knows how to connect RN-XV to Arduino Uno?
I use it with the Arduino Wireless shield connected to the hardware serial interface. I had absolutely no success with connecting it to other pins using the SoftwareSerial emulation, the chip seems to be quite picky about serial timings. I used direct serial commands to control the chip but in the meantime there are several libraries available (WiFly and the like) but I cannot recommend one as I don't use them.