Editing esp (section)

===ESP.deepSleep()===
 ESP.deepSleep(microseconds, mode)
will put the chip into deep sleep. mode is one of
 WAKE_RF_DEFAULT
 WAKE_RFCAL
 WAKE_NO_RFCAL
 WAKE_RF_DISABLED.
(GPIO16 needs to be tied to RST to wake from deepSleep.) The chip can sleep for at most <b>ESP.deepSleepMax()</b> microseconds. If you implement deep sleep with WAKE_RF_DISABLED and require WiFi functionality on wake up, you will need to implement an additional WAKE_RF_DEFAULT before WiFi functionality is available.

ESP.deepSleepInstant(microseconds, mode) works similarly to ESP.deepSleep but sleeps instantly without waiting for WiFi to shutdown.


;Steps to use the Deep-sleep mode:
# Connect the module with the Wi-Fi AP
# Perform a task like reading a sensor value, publishing an MQTT message, etc.
# Sleep for a defined number of microseconds
# Repeat the above process again
Sleep time is defined in microseconds. According to the ESP8266 SDK, you can only sleep for 4,294,967,295 µs which is about ~71 minutes.

Example:
 Serial.println("deep sleep for 15 seconds");
 ESP.deepSleep(15e6);

The system goes into Deep-sleep mode via the following interface: 
 ESPdeepSleep(uint32 time_in_us)
If time is == 0, then the chip won’t be woken up at regular intervals, i.e., won’t wake up automatically.
 ESP.dsleep(0)    //Will cause the ESP to sleep forever.
The mode WAKE_RF_DISABLED doesn't change how deep-sleep works, the mode changes what happens when the device wakes up. In deep-sleep WiFi is always off, no matter what mode you give it.
WAKE_RF_DISABLED	disables WiFi when you reset the device/it wakes up.

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