Try testing if snip.uart works for you or not.
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It looks like you modified the snip.uart app to print "UART Rx" when data is received. If you look at the makefile, you should see that WICED_DISABLE_STDIO is defined. This define will disable stdio calls which WPRINT_APP_INFO uses. Try using wiced_uart_transmit_bytes instead of WPRINT_APP_INFO.
Thanks for your valuable answer.
first of all test with the snip.uart it is working ok, then after testing with my code it is working fine.