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The “base” (master) branch of the SDI12 library should claim all possible on change interrupts so you don’t need to mess with calling them yourself. You only need to define the interrupts if you work off the ExtInts branch or if you compile with a build flag to set SDI12_EXTERNAL_PCINT. I think the latter is only possible in PlatformIO. If you’re using an example PlatformIO configuration file from the ModularSensors library, you should see the build flag set there.
What changes needed to be made inside the sdi-12 library? Bigger buffer? Anything else?