esp-idf/docs/api-reference/system/index.rst

System API
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.. toctree::
   :maxdepth: 1

   Heap Memory Allocation <mem_alloc>
   Heap Memory Debugging <heap_debug>
   Interrupt Allocation <intr_alloc>
   Watchdogs <wdts>
   Over The Air Updates (OTA) <ota>
   Sleep Modes <sleep_modes>
   Logging <log>
   Base MAC address <base_mac_address>
   Application Level Tracing <app_trace>


Example code for this API section is provided in :example:`system` directory of ESP-IDF examples.