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Is there any documentation available for the RIL (Radio Interface Layer)?

Is there any documentation available for the RIL (Radio Interface Layer)?

See Android Platform Development Kit - Radio Interface Layer

See also android/hardware/ril/include/telephony/ril.h for more details of RIL functions which needs to be implemented. Also you can get a reference implementation in android/hardware/ril/reference-ril/. That's probably the closest you will find to "documentation".