Mongoose OS does not replace the native SDK for any given platform. Instead, it adds to the native SDK capabilities. Therefore, for C/C++, all native SDK functions are available under Mongoose OS - just include the relevant header and call the function you want.
You can easily expand the list of exported functions yourself, just add
my_api.js file to your app or library and rebuild:
Deep Sleep given number of microseconds. Return value: false on error, otherwise does not return.
Read built-in temperature sensor. Return value: integer.
Read built-in Hall sensor. Return value: integer.
Deep Sleep given number of microseconds. Return value: does not return.