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Install Arduino 1.6.5 from the Arduino website.

Start Arduino and open Preferences window.
Enter http://arduino.esp8266.com/stable/package_esp8266com_index.json into Additional Board Manager URLs field. You can add multiple URLs, separating them with commas.
Open Boards Manager from Tools > Board menu and install esp8266 platform (and don't forget to select your ESP8266 board from Tools > Board menu after installation).

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ESP8266 AT Command Set
Function AT Command Response
Working AT OK
Restart AT+RST OK [System Ready, Vendor:www.ai-thinker.com]
Firmware version AT+GMR AT+GMR 0018000902 OK
List Access Points AT+CWLAP AT+CWLAP +CWLAP:(4,"RochefortSurLac",-
38,"70:62:b8:6f:6d:58",1)
+CWLAP:(4,"LiliPad2.4",-83,"f8:7b:8c:1e:7c:6d",1)
OK
Join Access Point AT+CWJAP?
AT+CWJAP="SSID","Password"
Query AT+CWJAP? +CWJAP:"RochefortSurLac" OK
Quit Access Point AT+CWQAP=?
AT+CWQAP
Query
OK
Get IP Address AT+CIFSR AT+CIFSR 192.168.0.105
OK
Set Parameters of
Access Point
AT+ CWSAP?
AT+ CWSAP= <ssid>,<pwd>,<chl>, <ecn>
Query
ssid, pwd
chl = channel, ecn = encryption
WiFi Mode AT+CWMODE?
AT+CWMODE=1
AT+CWMODE=2
AT+CWMODE=3
Query
STA
AP
BOTH
Set up TCP or UDP
connection
AT+CIPSTART=?
(CIPMUX=0) AT+CIPSTART =
<type>,<addr>,<port>
(CIPMUX=1) AT+CIPSTART=
<id><type>,<addr>, <port>
Query
id = 0-4, type = TCP/UDP, addr = IP address, port= port
TCP/UDP
Connections
AT+ CIPMUX?
AT+ CIPMUX=0
AT+ CIPMUX=1
Query
Single
Multiple
Check join devices' IP AT+CWLIF
TCP/IP Connection
Status
AT+CIPSTATUS AT+CIPSTATUS? no this fun
Send TCP/IP data (CIPMUX=0) AT+CIPSEND=<length>;
(CIPMUX=1) AT+CIPSEND= <id>,<length>
Close TCP / UDP
connection
AT+CIPCLOSE=<id> or AT+CIPCLOSE
Set as server AT+ CIPSERVER= <mode>[,<port>] mode 0 to close server mode; mode 1 to open; port = port
Set the server
timeout
AT+CIPSTO?
AT+CIPSTO=<time>
Query
<time>0~28800 in seconds
Baud Rate* AT+CIOBAUD?
Supported: 9600, 19200, 38400, 74880,
115200, 230400, 460800, 921600
Query AT+CIOBAUD? +CIOBAUD:9600 OK
Check IP address AT+CIFSR AT+CIFSR 192.168.0.106
OK
Firmware Upgrade
(from Cloud)
AT+CIUPDATE 1. +CIPUPDATE:1 found server
2. +CIPUPDATE:2 connect server
3. +CIPUPDATE:3 got edition
4. +CIPUPDATE:4 start update
Received data +IPD (CIPMUX=0): + IPD, <len>:
(CIPMUX=1): + IPD, <id>, <len>: <data>
Watchdog Enable* AT+CSYSWDTENABLE Watchdog, auto restart when program errors occur: enable
Watchdog Disable* AT+CSYSWDTDISABLE Watchdog, auto restart when program errors occur: disable
* New in V0.9.2.2 (from http://www.electrodragon.com/w/Wi07c)