- Move TypeConversion from namespace esp8266 to namespace experimental. (#7252)

- Add using namespace experimental::crypto; to HelloCrypto.ino.

- Add mention about new random function in libraries.rst.

- Update keywords.

Co-authored-by: Anders <andlo151@student.liu.se>

doc/libraries.rst

@@ -113,6 +113,8 @@ Some ESP-specific APIs related to deep sleep, RTC and flash memories are availab
 
 ``ESP.getCycleCount()`` returns the cpu instruction cycle count since start as an unsigned 32-bit. This is useful for accurate timing of very short actions like bit banging.
 
+``ESP.random()`` should be used to generate true random numbers on the ESP. Returns an unsigned 32-bit integer with the random number. An alternate version is also available that fills an array of arbitrary length. Note that it seems as though the WiFi needs to be enabled to generate entropy for the random numbers, otherwise pseudo-random numbers are used.
+
 ``ESP.checkFlashCRC()`` calculates the CRC of the program memory (not including any filesystems) and compares it to the one embedded in the image.  If this call returns ``false`` then the flash has been corrupted.  At that point, you may want to consider trying to send a MQTT message, to start a re-download of the application, blink a LED in an `SOS` pattern, etc.  However, since the flash is known corrupted at this point there is no guarantee the app will be able to perform any of these operations, so in safety critical deployments an immediate shutdown to a fail-safe mode may be indicated.
 
 ``ESP.getVcc()`` may be used to measure supply voltage. ESP needs to reconfigure the ADC at startup in order for this feature to be available. Add the following line to the top of your sketch to use ``getVcc``: