Programming Tutorials

  You have integrated the Smaato SDK, your build succeeds, and the app launches. But where the ad should be, there is only whitespace. In your Logcat or Xcode console, you see the dreaded, vague response:   NO_AD_AVAILABLE   or the internal   Error 42 . For mobile developers and monetization managers, this is a critical revenue leak. When the SDK returns "No Fill," it isn't just a technical glitch; it is a failure of the auction logic or the transport layer. This guide moves beyond generic advice like "check your internet connection." We will dissect the root causes of Smaato delivery failures, analyze the OpenRTB handshake mechanics, and provide the specific Kotlin and Swift implementations required to debug and resolve these errors. The Root Cause: What "No Fill" Actually Means To fix the error, you must understand the architecture of a mobile ad request. When your app calls  loadAd() , the Smaato SDK initiates a complex chain of events: The Bid Requ...