Are you attempting to run my timer extension on Android? If yes, then it should be working already using Defold 1.2.103 . I tried it on an Android device and the timer extension example is work as expected.
What do you mean by this? Are you bundling and installing an APK or are you running using dmengine.apk and streaming your content to device? Running dmengine.apk will not work since it contains a standard version of the engine without any native extensions.