The only OTA Peerapp we officially support is the one for Windows included in the SDK.
The secure version of this app is located under: /WICED-Smart-SDK/Apps/ota_secure_firmware_upgrade/peerapps/Windows
There is also an OTA sample app in C offered here within the WICED Sense folder: /WICED-Smart-SDK/Apps/wiced_sense/ws_sec_upgrade_ota.c
In addition, one of our power users, userc_4697, provided some OTA code for Android here in his Help Article:
I'll ask someone on the apps team to confirm that this is all we have available.
These are source codes for WICED Sense App for Android and iOS
Android app supports OTA and you can see it in the source code.
As far as I'm aware, the iOS version doesn't support OTA, but you can take a look at the source code anyways.
Hope this helps.