I have managed to communicate between MCU and wizfi250 and an android app.
If I use UART with no hardware control (not connecting the RTS,CTS pins) the devices communicate well.
If I set the MCU and wizi to have H/W control in order to use the RTC and CTS pins, then the devices communicate even if the CTS and RTS pins are not connected!
Should not the communication have failed if the pins are left unconnected? Is uart with HW control work even with no CTS , RTS connection?