What function calls are provided by the ShortStack API? The ShortStack API provides approximately 10 function calls. The four that you will typically use in your application are the following: void lonInit(void); void lonEventHandler(void); Byte *lonGetNvValue(Byte nvIndex); Bool lonSendNvUpdate(Byte nvIndex, const Byte* pData, Byte len); Additional functions are provided to receive notification of network variable updates, to send and receive application messages, and to send service pin messages.