Update README.md

README.md

@@ -25,7 +25,7 @@ to adapt the wiring for other versions.
 ![ESP8266](/images/ESP8266-Pinout.png)
 
 Pin | Name  | Wire to
----------------------------------------
+----|-------|--------------------------
 1   | GND   | Ground
 2   | TX    | RX (serial input) of connected device
 3   | GPIO2 | --> LED --> 150+ Ohm Resistor --> Ground
@@ -35,6 +35,12 @@ Pin | Name  | Wire to
 7   | RX    | TX (serial output) of connected device
 8   | VCC   | +3.3V
 
+The LED on pin 3 (GPIO2) is not required but helpful since it displays the WiFi
+connection status: Off means "not connected", Blinking means "connecting", On means "connected".
+
+If you would like to be able to reset the module without turning off power then
+connect pin 6 (RESET) via a pushbutton to ground (keep the resistor though).
+
 ## Initial setup
 
 Initial setup (i.e. connecting to the WiFi network) is done via the serial connection.
@@ -46,3 +52,41 @@ After the information is entered, the module will attempt to connect to the netw
 and display its IP address if successful. The module is now fully active, using
 9600 baud 8N1 on the serial port. To change the serial parameters, connect to
 the module's web server (see below).
+
+## Changing the WiFi network connection
+
+Once the WiFi setup is completed, the module will automatically attempt to re-connect
+to the network when it boots up. The LED will blink while connecting. If a connection
+can not be established, the module automatically goes into network configuration mode
+(same as during initial setup).
+
+If you wish to re-configure the WiFi network (i.e. select a different network), send
+an ESC (27) character over the serial port while the module is attempting to connect.
+Doing so will cause the module to go into network configuration mode.
+
+Note that network configuration is ALWAYS done at 9600 baud, 8N1 regardless of what
+the WiFi parameters were set to before.
+
+## Configuring the serial connection
+
+By default the module uses 9600 baud 8N1 on its serial connection. To modify the serial
+parameter, the module provides a (minimal) web server on port 80. After the module
+connects to WiFi it will display its IP address on the serial port. Using a web
+browser, connect to that address (port 80).
+
+The following options can be configured:
+
+- Baud rate: a number of pre-defined baud rates are given. You can set a custom
+  rate by going to the following URL: http://[module-ip-address]/set?baud=[rate]
+  where "rate" is the desired baud rate.
+- Data bits (5-8)
+- Parity (none, even, odd)
+- Stop bits (1 or 2)
+- Show WiFi connection information: enable or disable whether or not the module
+  will send out it's IP address on the serial connection after booting up.
+- Telnet negotiation: the Telnet protocol includes a negotiation protocol to
+  agree on some terminal options. The module can either handle this for you
+  in a very basic way (will basically say "no" to any requested option) or pass
+  the negotiation through to the device connected on the serial port.
+  Not handling the Telnet negotiation may show some weird characters when connecting
+  some BBSs. Some may also stop communicating at all after connecting.