docs: Update esp8266 documentation to match the code.

* Move the esp.status() to network module.
* Describe the wifi.isconnected() method.
* Describe esp.mac(), esp.wifi_mode(), esp.phy_mode(), esp.sleep_type(),
  esp.deepsleep(), and esp.flash_id() functions.

docs/library/esp.rst

@@ -10,18 +10,12 @@ The ``esp`` module contains specific functions related to the ESP8266 module.
 Functions
 ---------
 
-.. function:: status()
+.. function:: mac([address])
 
-    Return the current status of the wireless connection.
+    Get or set the network interface's MAC address.
 
-    The possible statuses are defined as constants:
-
-        * ``STAT_IDLE`` -- no connection and no activity,
-        * ``STAT_CONNECTING`` -- connecting in progress,
-        * ``STAT_WRONG_PASSWORD`` -- failed due to incorrect password,
-        * ``STAT_NO_AP_FOUND`` -- failed because no access point replied,
-        * ``STAT_CONNECT_FAIL`` -- failed due to other problems,
-        * ``STAT_GOT_IP`` -- connection susccessful.
+    If the ``address`` parameter is provided, sets the address to its value. If
+    the function is called wihout parameters, returns the current address.
 
 .. function:: getaddrinfo((hostname, port, lambda))
 
@@ -31,6 +25,61 @@ Functions
     called with two arguments, first being the hostname being resolved,
     second a tuple with information about that hostname.
 
+.. function:: wifi_mode([mode])
+
+    Get or set the wireless network operating mode.
+
+    If the ``mode`` parameter is provided, sets the mode to its value. If
+    the function is called wihout parameters, returns the current mode.
+
+    The possible modes are defined as constants:
+
+        * ``STA_MODE`` -- station mode,
+        * ``AP_MODE`` -- software access point mode,
+        * ``STA_AP_MODE`` -- mixed station and software access point mode.
+
+.. function:: phy_mode([mode])
+
+    Get or set the network interface mode.
+
+    If the ``mode`` parameter is provided, sets the mode to its value. If
+    the function is called wihout parameters, returns the current mode.
+
+    The possible modes are defined as constants:
+        * ``MODE_11B`` -- IEEE 802.11b,
+        * ``MODE_11G`` -- IEEE 802.11g,
+        * ``MODE_11N`` -- IEEE 802.11n.
+
+.. function:: sleep_type([sleep_type])
+
+    Get or set the sleep type.
+
+    If the ``sleep_type`` parameter is provided, sets the sleep type to its
+    value. If the function is called wihout parameters, returns the current
+    sleep type.
+
+    The possible sleep types are defined as constants:
+
+        * ``SLEEP_NONE`` -- all functions enabled,
+        * ``SLEEP_MODEM`` -- modem sleep, shuts down the WiFi Modem circuit.
+        * ``SLEEP_LIGHT`` -- light sleep, shuts down the WiFi Modem circuit
+          and suspends the processor periodically.
+
+    The system enters the set sleep mode automatically when possible.
+
+.. function:: deepsleep(time=0)
+
+    Enter deep sleep.
+
+    The whole module powers down, except for the RTC clock circuit, which can
+    be used to restart the module after the specified time if the pin 16 is
+    connected to the reset pin. Otherwise the module will sleep until manually
+    reset.
+
+.. function:: flash_id()
+
+    Read the device ID of the flash memory.
+
 Classes
 -------
 

docs/library/network.rst

@@ -236,6 +236,26 @@ class WLAN
             * 0 -- visible
             * 1 -- hidden
 
+    .. method:: status()
+
+        Return the current status of the wireless connection.
+
+        The possible statuses are defined as constants:
+
+            * ``STAT_IDLE`` -- no connection and no activity,
+            * ``STAT_CONNECTING`` -- connecting in progress,
+            * ``STAT_WRONG_PASSWORD`` -- failed due to incorrect password,
+            * ``STAT_NO_AP_FOUND`` -- failed because no access point replied,
+            * ``STAT_CONNECT_FAIL`` -- failed due to other problems,
+            * ``STAT_GOT_IP`` -- connection susccessful.
+
+    .. method:: wlan.isconnected()
+
+        In case of STA mode, returns ``True`` if connected to a wifi access
+        point and has a valid IP address.  In AP mode returns ``True`` when a
+        station is connected. Returns ``False`` otherwise.
+
+
 .. only:: port_wipy
 
     This class provides a driver for WiFi network processor in the WiPy.  Example usage::