This article discusses software internally used by Apple.
Acquiring a copy without Apple's consent is illegal and may result in being scammed.
Not much is known about dtxCaliente. It seems that it was introduced in factory firmwares such as Sundance 10A23941s that are based on internal versions of iOS 6.0 and up. Its actual purpose is currently unknown, but can be speculated to be a temperature diagnostic given its name (“caliente” is “hot” in Spanish) and logging of temperature while in the app.
The Contents of the App:
IQC03_White.bmp PkgInfo IQC04_Black.bmp ResourceRules.plist Info.plist _CodeSignature P01-01.bmp com.apple.dtxCaliente.plist P01-02.bmp dtxCaliente P02-01.bmp myIcon.tiff P02-02.bmp preferences.xml