Soft-AP documentation update (#5088)

* Add information about the max_connection constructor argument.

* Correct information about max soft-AP connections.

* Add information about what happens when max_connection is reached.

* Correct terminology

* - Correct the valid range of max_connection to 1 - 8.
- Include reference.

doc/esp8266wifi/readme.rst

@@ -125,7 +125,7 @@ Soft Access Point
 ~~~~~~~~~~~~~~~~~
 
 An `access point (AP) <https://en.wikipedia.org/wiki/Wireless_access_point>`__ is a device that provides access to Wi-Fi network to other devices (stations)
-and connects them further to a wired network. ESP8266 can provide similar functionality except it does not have interface to a wired network. Such mode of operation is called soft access point (soft-AP). The maximum number of stations connected to the soft-AP is five.
+and connects them further to a wired network. ESP8266 can provide similar functionality except it does not have interface to a wired network. Such mode of operation is called soft access point (soft-AP). The maximum number of stations that can simultaneously be connected to the soft-AP can be set `from 1 to 8 <https://bbs.espressif.com/viewtopic.php?f=46&t=481&p=1832&hilit=max_connection#p1832>`__, but defaults to 4.
 
 .. figure:: pictures/esp8266-soft-access-point.png
    :alt: ESP8266 operating in the Soft Access Point mode

doc/esp8266wifi/soft-access-point-class.rst

@@ -44,11 +44,11 @@ To set up password protected network, or to configure additional network paramet
 
 .. code:: cpp
 
-    WiFi.softAP(ssid, password, channel, hidden)
+    WiFi.softAP(ssid, password, channel, hidden, max_connection)
 
-The first parameter of this function is required, remaining three are optional.
+The first parameter of this function is required, remaining four are optional.
 
-Meaning of all parameters is as follows: - ``ssid`` - character string containing network SSID (max. 63 characters) \* ``password`` - optional character string with a password. For WPA2-PSK network it should be at least 8 character long. If not specified, the access point will be open for anybody to connect. \* ``channel`` - optional parameter to set Wi-Fi channel, from 1 to 13. Default channel = 1. \* ``hidden`` - optional parameter, if set to ``true`` will hide SSID
+Meaning of all parameters is as follows: - ``ssid`` - character string containing network SSID (max. 63 characters) \* ``password`` - optional character string with a password. For WPA2-PSK network it should be at least 8 character long. If not specified, the access point will be open for anybody to connect. \* ``channel`` - optional parameter to set Wi-Fi channel, from 1 to 13. Default channel = 1. \* ``hidden`` - optional parameter, if set to ``true`` will hide SSID. \* ``max_connection`` - optional parameter to set max simultaneous connected stations, `from 1 to 8 <https://bbs.espressif.com/viewtopic.php?f=46&t=481&p=1832&hilit=max_connection#p1832>`__. Defaults to 4. Once the max number has been reached, any other station that wants to connect will be forced to wait until an already connected station disconnects.
 
 Function will return ``true`` or ``false`` depending on result of setting the soft-AP.
 
@@ -131,7 +131,7 @@ Get the count of the stations that are connected to the soft-AP interface.
 
     Stations connected to soft-AP = 2
 
-Note: the maximum number of stations that may be connected to ESP8266 soft-AP is five.
+Note: the maximum number of stations that may be connected to ESP8266 soft-AP is 4 by default. This can be changed from 1 to 8 via the ``max_connection`` argument of the softAP method.
 
 softAPdisconnect
 ^^^^^^^^^^^^^^^^

libraries/ESP8266WiFi/src/ESP8266WiFiAP.cpp

@@ -89,7 +89,7 @@ static bool softap_config_equal(const softap_config& lhs, const softap_config& r
  * @param passphrase        (for WPA2 min 8 char, for open use NULL)
  * @param channel           WiFi channel number, 1 - 13.
  * @param ssid_hidden       Network cloaking (0 = broadcast SSID, 1 = hide SSID)
- * @param max_connection    Max simultaneous connected clients, 1 - 4.
+ * @param max_connection    Max simultaneous connected clients, 1 - 8. https://bbs.espressif.com/viewtopic.php?f=46&t=481&p=1832&hilit=max_connection#p1832
  */
 bool ESP8266WiFiAPClass::softAP(const char* ssid, const char* passphrase, int channel, int ssid_hidden, int max_connection) {