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Please have a look at example ota_firmware_upgrade (/20719-B0_Bluetooth/apps/snip/ota_firmware_upgrade).
Refer WICED-Secure-Over-the-Air-Firmware-Upgrade.pdf and WICED-Firmware-Upgrade-Library.pdf from the doc folder.
Please refer the example and integrate the OTA functionality to your hello sensor example for downloading the new application image from android.
Thank you so much for your reply. Now it is working.