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You can use WPRINT_APP_INFO() to print UART data received. You can look at snip.scan to understand how to use this. Was this this the intended question? If not could you please elaborate on what is needed.
Where is the HTML page being hosted on? Is it on the WICED device? If so I am not sure if you can dynamically update the HTML page without refreshing the webpage on the client side. If dynamic update is needed you would need a JS running to link the data read and push it onto the HTML page.
My original message mentions modifying the appliance demo application. This is a web server JS demo application. I need to pass uart received data to html page running on cypress device. In my case I will be using the CYW43903. Please let me know how to pass uart received data to html page running on a wiced device. Thanks.