AirM2M Communication Technology A6501 WIFI module User Manual Manual
Shanghai AirM2M Communication Technology Co., Ltd WIFI module Manual
Manual
1
AirM2M_ESP8266_WiFi module user's manual V2.3
A6501
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 2 of 48
Directory
1.1.Product introduction ................................................................................................................................... 5
1.1.1.Summary ............................................................................................................................................. 5
1.1.2Module PCB footprint ................................................................................................................. 6
1.1.3Module basic parameters ............................................................................................................ 7
1.2.Hardware introduction ........................................................................................................................ 8
1.2.1 A6501 ............................................................................................................................................ 8
1.3.Power consumption ........................................................................................................................... 11
1.4.Dimension ......................................................................................................................................... 12
1.5.WiFi antenna ..................................................................................................................................... 12
1.6.Recommended furnace temperature curve ........................................................................................ 13
2.Functional description ............................................................................................................................... 13
2.1.Main function .................................................................................................................................... 13
2.2.Operating mode ................................................................................................................................. 13
2.3.Application fields .............................................................................................................................. 14
2.4.AirM2M Cloud ................................................................................................................................. 14
3.EVB Introduction ...................................................................................................................................... 14
4.PC Configuration tool ............................................................................................................................... 15
4.1.Basic application methods ................................................................................................................ 15
4.2.IO/PWM function demonstration...................................................................................................... 20
5.AT Instructions Introduction ..................................................................................................................... 21
5.1.Basic AT instruction .......................................................................................................................... 21
5.1.1 Reboot module：AT+RST ............................................................................................................... 21
5.2.WiFi function AT instruction ............................................................................................................ 21
5.2.1Select WiFi application mode：AT+CWMODE ...................................................................... 21
5.2.2List current available access points: AT+CWLAP .................................................................... 22
5.2.3Add access point:AT+CWJAP .................................................................................................. 22
5.2.4Quit access point: AT+CWQAP ................................................................................................ 23
5.2.5Set parameter in AP mode: AT+CWSAP .................................................................................. 23
5.2.6Inquire MAC address: AT+AMMAC ....................................................................................... 23
5.2.7Start SMART LINK: AT+AMSL ........................................................................................ 24
5.3.TCPIP AT command ......................................................................................................................... 26
5.3.1set up TCP/UDP connection ：AT+CIPSTART ...................................................................... 26
5.3.2Get TCP/UDP connection mode ：AT+CIPSTATUS .............................................................. 26
5.3.3Start multi-connection：AT+CIPMUX .................................................................................... 29
5.3.4sending data：AT+CIPSEND ................................................................................................... 29
5.3.5Turn off TCP/UDP connection：AT+CIPCLOSE .................................................................... 30
5.3.6Obtain local IP address：AT+CIFSR ....................................................................................... 31
5.3.7Configure as server：AT+CIPSERVER ................................................................................... 31
5.3.8Module receives data from server：+IPD and+RECEIVE ...................................................... 32
5.3.9Select TCPIP application mode ：AT+CIPMODE .................................................................. 32
5.3.10Save transparent transmission configuration：AT+CIPSCON ................................................. 33
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 3 of 48
5.3.11Time-out time set for server disconnected automatically：AT+CIPSTO ................................. 34
5.3.12Set TE-TA Baud rate：AT+IPR ................................................................................................ 35
5.3.13Select non-transparent transmission data sending mode：AT+CIPQSEND ............................ 36
5.3.14Quit transparent transmission mode: + + + ............................................................................... 36
5.3.15Application example ................................................................................................................. 37
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 4 of 48
Table 1 Terms and abbreviations
Abbreviations Descriptions
WiFi Wireless Fidelity
UART Universal Asynchronous Receiver & Transmitter
DTIM Delivery Traffic Indication Message
SOC System On a Chip
P2P Point to Point
TCP Transmission Control Protocol
IP Internet Protocol
STBC Space-Time Block Coding
MIMO Multiple Input Multiple Output
MPDU MAC Protocol Data Unit
MSDU MAC Server Data Unit
IEEE Institute Of Electrical And Electronics Engineers
bps Bits Per Second
CCK Corporate Control Key
DQPSK Differential Quadrature Phase Shift Keying
DBPSK Differential Binary Phase Shift Keying
QAM Quadrature Amplitude Modulation
OFDM Orthogonal Frequency Division Multiplexing
WPA Wi-Fi Protected Access
WPS Wi-Fi Protected Setup
TKIP Temporal Key Integrity Protocol
WAPI Wlan Authentication And Privacy Infrastructure
WEP Wired Equivalent Privacy
CRC Cyclic Redundancy Check
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 5 of 48
1.1. Product introduction
1.1.1. Summary
Up to now Shanghai AirM2M Communication Technology Co., Ltd has released 3 kinds of ESP8266 WiFi
modules, including A6501、A6501S and A6502. There will be more kinds coming to meet different PCB footprint
requirements of enterprise users and individual developers.
A650X series transparent transmission modules own competitive PCB footprint sizes in the industry and
ultralow energy consumption technology. They are designed for mobile devices and internet applications, which
can connect users’ physical devices to WiFi wireless network. So communications happen on internet or local area
network to make interconnection come true.
There are different kinds of PCB footprint sizes for A650X series transparent transmission modules. Some
models of antennas can even support onboard PCB antennas, IPEX interfaces and stamp hole interfaces.
A650X series transparent transmission modules can be widely used on smart power grids, intelligent
transportation, intelligent furniture, handheld devices, industrial control and so on.
For more details please refer to http://www.luam2m.com/
Product features
z Support 802.11 b/g/n wireless standard
z Support STA/AP/STA+AP 3 working modes
z Built-in TCP/IP protocol stack, support multipath TCP Client connections
z Support abundant Socket AT commands.
z Built-in 32 bit MCU, can be used as the application processor
z Support UART/GPIO data communication interfaces
z Support PWM output
z Support I2C interfaces
z Support WiFi configuration parameters
z Support Smart Link intelligent networking function
z Support remote firmware upgrade （OTA）
z 3.3V single power supply
z Support multiple power consumption modes like Active、Modem sleep、Light sleep、Deep sleep
z Ultralow power consumption, suitable for battery-powered applications
z ESP8266 software owns industry leading stability
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 6 of 48
1.1.2 Module PCB footprint
AirM2M ESP8266 A650X series transparent transmission modules support multiple PCB footprints, which
greatly enriches users’ choice. They can be easily applied to a variety of networking hardware terminal situation.
A6501
Picture 1 A6501 PCB footprint modes A plan view and a bottom view
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 7 of 48
1.1.3 Module basic parameters
Table 2 Module technical specifications
A650X Mater chip ESP8266
Wireless
parameters
wireless standard IEEE 802.11b/g/n
frequency range 2.412GHz-2.462GHz
transmitting power(PK)
802.11b: +16 +/-2dBm (@11Mbps)
802.11g: +14 +/-2dBm (@54Mbps)
802.11n: +13 +/-2dBm (@HT20, MCS7)
receiving sensitivity
802.11b: -91 dBm (@11Mbps ,CCK)
802.11g: -75dBm (@54Mbps, OFDM)
802.11n: -71dBm (@HT20, MCS7)
Hardware
parameters
hardware interface UART，IIC，PWM，GPIO，ADC
working voltage 3.0V--3.6V
GPIO drive capability Max：15ma
working current
Active State, normal mode: average value：~70mA, peak value:
215mA；
Modem Sleep, turnoff Modem，CPU work: average value： ~15mA；
Light Sleep，turnoff Modem and CPU， wake up while break off：
0.9mA；
Deep Sleep，turnoff Modem and CPU， no wake up while break off：
<15uA；
operating temperature -40℃~125℃
storage environment temperature：<40℃，relative humidity：<90%R.H.
dimension
A6501： PCB onboard PCB antenna：16*24*3.3mm； built-out
antenna：16*18.6*3.3mm；
A6501S： PCB onboard PCB antenna：16*32*3.3mm； built-out
antenna：16*24.6*3.3mm；
A6502： PCB onboard PCB antenna：11.8*24*3mm；
Serial
transmission
transmission rate 9600-460800bps
TCP Client 4
Software
parameters
wireless network types STA/AP/STA+AP
security mechanism WEP/WPA-PSK/WPA2-PSK
Encryption type WEP64/WEP128/TKIP/AES
firm upgrade local serial, OTA remote upgrade
networking protocol IPv4, TCP/UDP/FTP/HTTP
user configuration
AT+ instruction set
Web page + PC configuration tool
Android/iOS terminal Smart Link intelligent configuration APP
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 8 of 48
1.2. Hardware introduction
A650X series modules using ESP8266 SOC processor with abundant hardware interface can support UART，
IIC，PWM，GPIO，ADC, which can be widely used on different internet application situations.
1.2.1 A6501
Picture 2 A6501 pin configuration
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 9 of 48
A6501 Pin detailed descriptions:
Table 1 A6501 Pin definition
PIN Function Description
1 U1CTS
1）UART_CTS， send request；
2）General Purpose Input/Output：GPIO3；
3）U U0TXD，ESP8266 using UART to receive message special for download；
2 U1RTS
1）UART_RTS， allow sending；
2）General Purpose Input/Output：GPIO1；
3) U0TXD，ESP8266 using UART to send message special for download；
4）Must remain vacant (internal pull up)when boot on, no pull down
3 U1RI 1）UART_RI， low level wake up opposite terminal MCU；
2）General Purpose Input/Output：GPIO5；
4 U1DTR 1）UART_DTR， low level wake up A650X；
2）General Purpose Input/Output：GPIO14；
5 HeartBeat
1）Deep Sleep mode： heart signal，need connect HeartBeat to RESET；
2）General Purpose Input/Output：GPIO16；
3）High level output is defaulted when boot up；
6 RESET 1）Non deepsleep mode: external reset signal, low level is effective
2）Deep sleep mode: RESET connect to Heartbeat
7 GND GND
8 ENABLE 1)Module enable Pin, internal 10K ohm pull up, default power up for booting
2)Shutdown on low level, power consumption current is less than 5uA
9 VDD 3.3V，module power supply；
10 ANT WiFi Antenna
11 GND GND
12 MODE
1）Red LED: Indication light control signal in WiFI operating situation is defaulted.
2）General Purpose Input/Output：GPIO0；
3）mode selection：
vancant：Flash Boot， normal operating mode；
pull down：UART Download， serial download mode；
13 ADC ADC， input range：0V-1V；
14 U1RXD 1）UART_RXD， receive signal；
2）General Purpose Input/Output：GPIO13；
15 U1TXD
1）UART_TXD， sending signal；
2)General Purpose Input/Output：GPIO15；
3)Module internal pull down at 10K ohm, no hardware pull up when boot up.
16 nReload
1）nReload, input interrupt, restore factory default settings: AP mode
2）General Purpose Input/Output：GPIO2；
3）Debug_TXD， used on output debugging log；
4）It must be high level when boot up, no hardware pull down
17 GPIO4 General Purpose Input/Output：GPIO4；
18 GPIO12 1)Blue LED：TCP/UDP indication light control signal is defaulted.
2)General Purpose Input/output：GPIO12(need software to setup in addition)
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 10 of 48
Remarks
1)There are 3 serials of A6501. UART1（U1RXD、U1TXD、U1CTS、U1RTS、U1DTR、U1RI）are data serials,
using on transparent transmission. UART0（U0RXD、U0TXD）are download serials, using on firmware updated.
Debug_UART（Debug_TXD）are debugging serials, using on output debugging log.
UART0 and Debug_UART are marked by red and dark yellow respectively.
2) In order to avoid module cannot boot up or unstable phenomenon, close attention should be paid on request for
initialization level on relative pins when boot up as most pins of A6501 are Multifunctional.
Pins that request initialization level when boot up already marked by blue color.
3) Signal“MODE”is used on module mode selection. Need connect “MODE”to“GND”when upgrading firmware.
4) Default functions are recommend to used on Pins of“MODE”、“nReload”、“GPIO12”, which are marked by
purple.
5) Statements for“Red LED”和“Blue LED”：
Red LED：
TCP/UDP connect to indicator, blinks when connected, extinguishes when disconnect.
Blue LED：
（1）Boot constant is 2S,and then turn off；
（2）TCP/UDP data indicator blinks when transmitting, extinguishes when finish.
6) There are 3 GPIO pins of A6501which are completely unrestricted (no request on initialization level, no default
function or default function can be modified). They are marked by green. First using these pins is recommended.
7) Difference between new version A6501_A11 and A6501_A10 are ：
（1）Module defaults power on for booting, pull down “ENABLE” when turn off.
（2）Pins location of GPIO12 and GPIO5（U0RI）are exchanged. GPIO5 is defined as U0RI signal.
（3）Optimized pin naming, e.g. changed “DEFAULT”to“nReload”
（4）Redefine UART0、UART1 and Debug_UART；
8)Special reminding：
Please remember that after software version 《SW_V0003_A6501_WEB》 of ESP8266 WiFi module of
Shanghai AirM2M, firmware upgrading serial and data transparent transmission serial won’t use a same
physical pin.
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 11 of 48
1.3. Power consumption
All the following power consumption data gained basing on 3.3V, 25° (temperature).
[1] All the tests are completed at the antenna interface.
[2] All emit data gained at continuous emission mode, basing on 90% of duty ratio.
Mode Min Normal Max unit
transmit 802.11b，CCK 1Mbps，Pout=+19.5dBm 215 mA
transmit 802.11b，CCK 11Mbps，Pout=+18.5dBm 197 mA
transmit 802.11g，OFDM54 Mbps，Pout=+16dBm 145 mA
transmit 802.11n，MCS7，Pout=+14dBm 135 mA
receive 802.11b，package length is 1024 bytes，-80dBm 60 mA
receive 802.11g，package length is 1024 bytes，-70dBm 60 mA
receive 802.11n，package length is 1024 bytes，-65dBm 62 mA
System standby mode 0.9 mA
Deep sleep 10 μA
Energy-saving mode DTIM1 1.2 mA
Energy-saving mode DTIM3 0.86 mA
Shutdown 0.5 μA
Table 5 Power consumption data
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 12 of 48
1.4. Dimension
A6501
Picture 5 A6501 module Pin footprint
1.5. WiFi antenna
A650X series modules support 3 kinds of antenna interfaces. They are onboard PCB antenna, IPEX interface
and stamp hole interface. Customers can use onboard PCB antenna and IPEX interface directly without adding
any matching circuit. Customers can use A650X stamp hole antenna interface if they want to design antenna part
on big board. In this case, matching circuit should be reserved on big board for this design. For example:
Picture 6 WiFi radio frequency reference circuit
Note:
1、 Above dashed box parts need antenna matching. Should take actual electronic components’ (who match with
antenna) parameters as standard.
2、 Need 50 ohm resistance for RF wiring. 90 degree angle wiring is forbidden. No longer than 15mm.
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 13 of 48
1.6. Recommended furnace temperature curve
Refer to IPC/JEDEC standard；Peak Temperature : <250°C；Number of Times: ≤2 times；
Picture 7 Recommended back flow curve
2. Functional description
2.1. Main function
Main functions that A650X series modules can achieve include serial port transmission, PWM control and GPIO
control.
Serial port transmission: data transmission, good reliability, stability, can reach 11Kbyte at serial rate 115200kbps
PWM control: light-control, three-colour LED control, motor speed control
GPIO control: control switch, relay and so on.
2.2. Operating mode
A650X modules support STA/AP/STA+AP 3 operating modes.
♦ STA mode: A6501 modules can connect to the internet by router. So cell phone or computer can remote
control device by internet.
♦ AP mode: As hotspot, A6501 modules achieve that cell phone, computer can communicate with modules
directly, which makes local area network wireless controlled come true.
♦ STA+AP mode: Coexist mode of these two modes. Can achieve seamless switching by internet control.
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 14 of 48
2.3. Application fields
♦ RS232 serial change to Wi-Fi
♦ industry transparent transmission
♦ Wi-Fi remote control
♦ toy field
♦ color LED control
♦ fire protection, security and intelligent integrated management
♦ Intelligent card terminal, wireless POS machine, Wi-Fi camera, handheld device.
2.4. AirM2M Cloud
AirM2M Cloud is internet cloud platform service creative by Shanghai AirM2M（AirM2M）. Users can
monitor and manage device on the platform to realize huge data management and analyze, which make device
intelligent really come true.
AirM2M Cloud can accept customers’ customized requests, including Web Page Configuration, Android/iOS
platform and App.
3. EVB Introduction
AirM2M can offer special UART_WiFi_EVB developmwnt board for customers’ to debug A650X. By this
development board, traditional serial device or MCU device can easily connect to WiFi network to realize
managing and controlling device by network.
This development board can offer hardware demonstration programs like UART serial port data transmission
solution, RGB light-control and intelligent socket. At the same time, development board has reserved hardware
circuit on which our GSM/GPRS standard module A2350 works as main control, MCU and A6501 serial port
transmits data.
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 15 of 48
Picture 8 EVB front view
Notice：
Due to this EVB is compatible to different application by using module’s periphery pins. So it need jumper
cap or buttons for distinguishing.
1）Button “download”: Press this button before power up for download until downloading begins.
2）Jumper wire “boot”: when break over, turn on; when break, shutdown.
3）Button “reset”: Restore factory default settings: AP mode.
4)“Button “reboot”: module’s hardware reboot, software configuration parameter won’t change.
4. PC Configuration tool
4.1. Basic application methods
A650X support using PC tools: AirM2M_ESP8266_CONFIG_TOOL to configure relative parameters for
easy using.
Here we take to set multilink transparent transmission mode(module working as STA+CLIENT) for
example, introducing following configuration steps:
Step 1 A650X wireless module is at power-up operating mode, and at AP mode or AP+STATION (default is
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 16 of 48
AP+STATION mode).
Step 2 Using computer’s WIFI function, to search wireless module A650X (all SSID WiFi device of AirM2M
are named as “AirM2M+MAC” e.g. AirM2M_97F502) and click connect.
Step 3 Open configuration tool AirM2M_WiFi_Tool. Please add trust if intercepted by security software.
Step 4 Turn on Web Control to Click “SEARCH”, the searched module will be showed at the left-hand
display column. If the module not searched, we can repeatedly click the button “SEARCH”.(Note: do not
support SEARCH temperately)
Step 5 Click “READ” in the “BASE” option card. Read basic data of AirM2M WiFi device. And to
configure SSID and password for module connection in Station Setting, and then click “SET”.
Step 6 Click “Setting TCPUDP client-side” option page to configure link. It supports 4 links most at the same
time.
Every linking and configuring 4 parameters:
Local_port：local port
Port：server port
Protocol：TCP or UDP
Ip: server IP address
To configure links basing on need. Here take 2 for example and then click “POST”
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 17 of 48
Note: If user want single link transparent transmission only, to configure one link at this step is
enough.
Step 7 Click “set transparent transmission mode” option page to set transparent transmission mode.
Data_mode = 1 ，transparent transmission mode
Data_mode = 0 ，non-transparent transmission mode，that is AT command mode
Set data_mode=1 over here，then POST
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 18 of 48
Step 8 Reboot module. After rebooting, module will turn into transparent transmission state. Look from the
server side, there will be two links established
Step 9 Open AT option page, turn on interface, put in data in the input box at the left corner. Look from the
server side, two links all received data “qqqqq”.
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 19 of 48
Step 10 Quit transparent transmission mode and go back to AT command mode.
Click “set transparent transmission mode” option page to set data_mode=0，POST, then reboot
module will be OK.
Note:
There are 3 ways to quit under transparent transmission mode:
1) + + + quit transparent transmission, but it will go back to transparent transmission mode after rebooting.
2) + + +, then AT+CIPSCON=0, it will go back to transparent transmission mode after rebooting module.
3) At setting transparent transmission mode option page of AirM2M_ESP8266_CONFIG_TOOL ，WEB
CONTROL->, set to 0 and then POST. Enter non-transparent transmission mode after rebooting module.
There are 2 ways to enter transparent transmission mode:
1) AT+CIPMODE=1，AT+CIPSERVER to configure server or AT+CIPSTAR to configure client side.
AT+CIPSCON=1, reboot module and then enter transparent transmission, and automatically set up
connection according to last saved data AT+CIPSCON=1.
2) At setting transparent transmission mode option page of AirM2M_ESP8266_CONFIG_TOOL ，WEB
CONTROL->, set to 0 and then POST. At setting TCPUDP client side/server option page to
configure CLIENT/SERVER, and then POST, reboot module to enter transparent transmission and
automatically set up connection according to configuration.
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 20 of 48
4.2. IO/PWM function demonstration
Select “I/O PWM” option, access interface as picture 11 shows to control RBG tricolor light, and control
relay switch.
Click “READ” to read current RGB LED, click “SET” to configure new parameters. Thereinto, “Frequency”
is used to adjust PWM output frequency to control Brightness of RGB. Buttons of “RED”、“GREEN”、“BLUE”
are used to adjust Color temperature value of RGB tricolor light. The color temperature value of red-green-blue
light is the same as color palette of Windows’ drawing.
Click “PRESS” button on relay controller to budge relay’s on and off.
Note：
1）RGB LED and relay switch function can match our company’s development board UART_WiFi_EVB for
demonstration.
2）Standard AT software version does not support this function.
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 21 of 48
5. AT Instructions Introduction
5.1. Basic AT instruction
5.1.1 Reboot module：AT+RST
Grammatical rules：
command type grammar backward and instruction
execute command AT+RST OK
5.2. WiFi function AT instruction
5.2.1 Select WiFi application mode：AT+CWMODE
Grammatical rules：
command
type
grammar backward and instruction
Set
command AT+CWMODE = <mode>
OK
(AT+RST)Command will be in valid after reboot
check
command AT+CWMODE?
+CWMODE:<mode>
OK
What mode is currently in?
test
command AT+CWMODE = ?
+CWMODE:(<mode> value list)
OK
What mode it support currently?
Parameter definition：
parameter
definition
definition value value instruction
<mode> WiFi application
mode
1 Station mode
2 AP mode
3 AP+Station mode
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 22 of 48
5.2.2 List current available access points: AT+CWLAP
Grammatical rules：
command
type
grammar backward and instruction
execute
command AT+ CW LAP
+CWLAP: <ecn>,<ssid>,<rssi>[,<mode>]
OK
this command will go back to AP list
Parameter definition：
parameter definition value value instruction
<ecn> encryption way
0 OPEN
1 WEP
2 WPA_PSK
3 WPA2_PSK
4 WPA_WPA2_PSK
<ssid> access point name character string parameter
<rssi> signal strength
<mode> connect mode 0 manual connect
1 automatic connection
5.2.3 Add access point:AT+CWJAP
Grammatical rules：
command
type
Grammar Backward and instruction
Set
command
AT+CWJAP=<ssid>,<pwd>
OK or ERROR
Successfully join AP, go back to OK. If not, go back to
ERROR
check
command AT+ CW JAP ?
+CWJAP:<ssid>
OK
go back to current choice AP
Parameter definition：
parameter definition value value instruction
<ssid> access point name character string
<pwd> password character string, the longest is 64 byte, ASCII coding
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 23 of 48
5.2.4 Quit access point: AT+CWQAP
Grammatical rules：
command
type
grammar backward and instruction
execute
command AT+CWQAP
OK
means exit this AP successfully
test
command AT+CWQAP=?
OK
check whether this command support
5.2.5 Set parameter in AP mode: AT+CWSAP
Grammatical rules：
command
type
grammar backward and instruction
set
command AT+CWSAP=<ssid>,<pwd>,<chl>, <ecn>
OK
successfully set parameters
check
command AT+ CW SAP ?
OK
check current AP parameter
parameter definition：
parameter definition value value instruction
<ecn> encryption way
0 OPEN
1 WEP
2 WPA_PSK
3 WPA2_PSK
4 WPA_WPA2_PSK
<ssid> access point name character string parameter
<pwd> password character string, the longest is 64 byte, ASCII coding
<chl> channel number
5.2.6 Inquire MAC address: AT+AMMAC
Grammatical rules：
command
type
grammar backward and instruction
execute
command
AT+AMMAC
If CWMODE set as 1（STA mode）：
STATION_MAC: xx:xx:xx:xx:xx:xx
OK
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 24 of 48
If CWMODE set as 2（AP mode）：
AP_MAC: xx:xx:xx:xx:xx:xx
OK
If CWMODE set as 3（STA+AP mode）：
STATION_MAC: xx:xx:xx:xx:xx:xx
AP_MAC: xx:xx:xx:xx:xx:xx
OK
Successfully set up parameters
Example：
command
（→）
/backward
（←）
example explanation and instruction
→ AT+CWMODE? Inquire WIFI level working mode
← +CWMODE::3
OK
3：AP+STA mode
→ AT+AMMAC Inquire AC address
← STATION_MAC: 18:fe:34:9e:ab:e4
AP_MAC: 1a:fe:34:9e:ab:e4
OK
→ AT+CWMODE=2 Set working mode to 2，AP mode
← OK
→ AT+AMMAC Inquire MAC adress
← AP_MAC: 1a:fe:34:9e:ab:e4
OK
5.2.7 Start SMART LINK: AT+AMSL
Grammatical rules：
Comman
d type grammar Backward and instruction
Set up
command AT+AMSL=1
Go back：
+AMSL:<ssid>,<password>
OK
instruction：successfully configured SMART LINK
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 25 of 48
parameter definition：
parameter definition value Value instruction
<ssid> AP hotspot name
<password> AP hotspot password
example：
comman
d（→）
/backwar
d（←）
example Explanation and instruction
z Turn on cell phone’s WIFI function
and link to router that module can
search (name it A for easy
understanding).
z Turn on SMARTLINK Android App that
released by our company. Input name
and password of router that we want
module link to. And click below
SMARTLINK button. Keep running
state until configuration finish.
Note: A and B can be a same one router.
That is to say cell phone can directly link to
router B that we want module link to. And
configure router (that module links to) as
B in APP.
→ AT+CWMODE? Inquire WIFI level working mode
← +CWMODE:1
OK
Mode 1：STA mode
Mode 3：STA+AP mode
Mode 1 and 3，both can use SMART LINK
But mode 2(pure AP mode)cannot
configure SMARTLINK.
→ AT+AMSL=1 Start SMART LINK configuration.
← +AMSL: yh_taih,qin02666
OK
It means configuration is successful if
backward of “wait for a moment” occurs.
Ssid = yh_taih
Password = qin02666
→ AT+CWJAP? Inquire which hotspot module joins up
currently.
← +CWJAP:"yh_taih"
OK
means successfully joined up yh_taih
Click STOP，turn off APP
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 26 of 48
5.3. TCPIP AT command
5.3.1 set up TCP/UDP connection ：AT+CIPSTART
Grammatical rules：
command
type
grammar backward and instruction
set
command
when single way connection (+CIPMUX=0)：
AT+CIPSTART=<type>,<addr>,<port>,[local_p
ort]
When multichannel connection:
AT+CIPSTART=<id>,<type>,<addr>,<port>,[lo
cal_port]
And local port is optional parameters
if format is right, go back：
OK
otherwise go back：
+CME ERROR: invalid input value
successfully connect, go back：
CONNECT OK (CPIMUX=0)
<id>, CONNECT OK (CIPMUX=1)
If connection already exist, go back：
ALREADY CONNECT
connection fail, go back：
CONNECT FAIL (CIPMUX=0)
<id>, CONNECT FAIL (CIPMUX=1)
parameter definition：
parameter definition value value instruction
<id> Link No. 0~4
means connected serial number.
server / 0 connection can be connected by client or
server, other ID can use on remote server
connection only.
<type> connection type “TCP”/”UDP”
<addr> Remote server IP
address character string
<port> remoter service port
number
[local_port] local port number, can select parameters
5.3.2 Get TCP/UDP connection mode ：AT+CIPSTATUS
Grammatical rules：
command
type
grammar backward and instruction
execute
command AT+CIPSTATUS
If it is single way connection (AT+CIPMUX=0), go back to
OK
STATE: <sl_state>
C:<cid>, <TCP/UDP>, <IP address>, <port>, <client state>
Note: If it is single way connection, it uses following way for connection:
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 27 of 48
AT+CIPSTART=<type>,<addr>,<port>,[local_port] way, and one link can be set
up only. Occupied <cid> = 0
If it is multiway connection (AT+CIPMUX=1), go back toOK
STATE:<ml_state>
S: <sid>,<port>,<server state>
C:<cid>, <TCP/UDP>, <IP address>, <port>, <client state>
test command AT+CIPSTATUS=? backward：
OK
parameter definition：
parameter definition value value instruction
<sl_state>
single way connection
state
IP INITIAL initialization
IP STATUS obtain local IP status
TCP CONNECTING/UDP
CONNECTING TCP connecting/UDP port registering
CONNECT OK successfully connect setup
TCP CLOSING/UDP
CLOSING
Shutting down TCP connection, and logging out
UDP port.
<sid> server ID 0~1 value 0 and 1
<server state> server status
OPENING turning on
LISTENING monitoring
CLOSING turning off
<cid> customer’s ID 0~3 value as 0,1,2,3
<IP address> IP address - character string parameters(need quotation mark for
character string)
<port> server monitor port
number - integer type
<client state> customer’s status
INITIAL turn off state
CONNECTING connecting
CＯＮＮＥＣＴＥＤ connected
example：
Command
backward
（←）
example Explanation and instruction
→ AT + C W M O D E ? Inquire WIFI level working mode
← +CWMODE::3
OK
3：AP+STA mode
→ AT+CIPMUX?
← +CIPMUX:0
OK
Single way connection mode
→ AT +C IPSTAT US
← OK
STATE:IP STATUS
C:0,"","",,"INITIAL"
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 28 of 48
C:1,"","",,"INITIAL"
C:2,"","",,"INITIAL"
C:3,"","",,"INITIAL"
→ AT+CIPSTART="TCP","192.168.1.51",6800 Set up one connection
← OK
CONNECT OK
→ AT +C IPSTAT US
← OK
STATE:CONNECT OK
C:0,"TCP","192.168.1.51",6800,"CONNECTED"
C:1,"","",,"INITIAL"
C:2,"","",,"INITIAL"
C:3,"","",,"INITIAL"
→ AT+CIPSTART="TCP","192.168.1.51",7800 Want to set up one more connection
← OK
ALREADY CONNECT
Cannot set up.
→ AT +C IPSTAT US inquire status
← OK
STATE:CONNECT OK
C:0,"TCP","192.168.1.51",6800,"CONNECTED"
C:1,"","",,"INITIAL"
C:2,"","",,"INITIAL"
C:3,"","",,"INITIAL"
Same as before
→ AT +C IPCL OSE Turn off connection
← CLOSE OK
→ AT+CIPMUX=1 Must turn off all connection before configure
multiway connection
← OK
→ AT+CIPSTART=0,"TCP","192.168.1.51",7800
← OK
0,CONNECT OK
→ AT+CIPSTART=1,"TCP","192.168.1.51",6800
← OK
1,CONNECT OK
→ AT+CIPSERVER=1,6000
← OK
→ AT +C IPSTAT US
← OK
STATE:IP STATUS
S:0,6000,LISTENING
C:0,"TCP","192.168.1.51",7800,"CONNECTED"
C:1,"TCP","192.168.1.51",6800,"CONNECTED"
C:2,"","",,"INITIAL"
C:3,"","",,"INITIAL"
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 29 of 48
5.3.3 Start multi-connection：AT+CIPMUX
Grammatical rules：
command
type
grammar backward and instruction
set
command
AT+CIPMUX=<mode>
OK
If it is at multiway connection mode, go back to
+CME ERROR: The socket is already connected
That is when there is already connection for module, <mode> value
can not be modified. Only when all connection are turned off by
using AT+CIPCLOSE, <mode> can be modified.
Instruction: Start multi-connection successfully
check
command AT+CIPMUX?
+CIPMUX:<mode>
OK
Instruction: Check whether it is at multi-connection status or not.
parameter definition：
parameter definition value value instruction
<mode>
whether to boot
multi-connection
mode
0 Configure to single way connection mode
1 Configure to multi- way connection mode
5.3.4 sending data：AT+CIPSEND
Grammatical rues：
command
type
Grammar backward and instruction
set
command
When single way connect
(+CIPMUX=0)：
AT+CIPSEND=<length>
When multi-way connect
(+CIPMUX=1)：
AT+CIPSEND=<id>,<length>
response
When module receives command it will line feed
back to ”>” first, then start to receive serial port
data. Data will be sent when it is full length.
If connection is not setup or connection is
interrupt, go back to ERROR; If successfully send
data, go back to SEND OK.
module executes wrongly, go back to ：
parameter error：
+CME ERROR: invalid input value
no connection setup：
+CME ERROR: The socket is not connected
instructi
on send assigned length data
test
command AT+CIPSEND=? response
single way connection(AT+CIPMUX=0) back
to ：
+CIPSEND: <length>
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 30 of 48
OK
multi-way connection(AT+CIPMUX=1) back to ：
+CIPSEND: <0-7>,<length>
OK
execute
command AT+CIPSEND instructi
on
AT+CIPMODE=1 and as customer-side mode, to
access into transparent transmission mode(need
support hardware flow control, otherwise data will
be lost when there is mass data.)
When module receives command it will line feed
back to ”>” first, then start to send data which
received by serial port.
Parameter definition：
parameter definition value value instruction
<length> data length unit: byte
<id> Link No. 0~3 connect serial number
5.3.5 Turn off TCP/UDP connection：AT+CIPCLOSE
Grammatical rules：
command
type
grammar backward and instruction
set command
Single way connection
AT+CIPCLOSE=<id>
go back：
CLOSE OK
Multi-way connection
AT+CIPCLOSE=<n>[,<id>]
go back：
<n>,CLOSE OK
execute
command AT+CIPCLOSE
If shut down successfully, go back：
CLOSE OK
If shut down fail, go back：
ERROR
test command AT+CIPCLOSE=? go back：
OK
Items need
attention
z Executing command is effective to single way connection, it will go back to ERROR when multi-way
connection.
z When executing command AT+CIPCLOSE, connection will be shut down only when at TCP/UDP
CONNECTING or CONNECT OK status, otherwise it will take shut down for fail and go back to ERROR.
z Status after shutting down is IP CLOSE when at single way connection mode.
parameter definition：
parameter definition value value instruction
<id> shut down mode 0 slow shutdown(default value)
1 quit shutdown
<n> Link No. 0~3
integer type, means connected serial number
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 31 of 48
5.3.6 Obtain local IP address：AT+CIFSR
Grammatical rules：
command
type
grammar Response and instruction
Execute
command AT+CIFSR response
+ CIFSR:<IP address>
OK
or
ERROR
test
command AT+CIFSR=? response OK
parameter definition：
parameter definition value value instruction
<IP address> Local current IP
address(station)
5.3.7 Configure as server：AT+CIPSERVER
Grammatical rules：
command
type
grammar Response and instruction
instru
ction
Need execute AT+CIPMUX=1 first, turn on mux mode.
To monitor 2 ports at most, including TCP and UDP.
Execute
command AT+CIPSERVER=<mode>[,<port>] respo
nse
After start server, it will automatically set up monitor by
server.
OK
If there is client connect to the server of this module then
it will go back to ：
<linkid>,CONNECT OK
If number 0 connection is occupied then it goes back to
+CME ERROR: no change
Note: Need reboot if use AT+CIPSERVER=0 to shut
down server.
parameter definition：
parameter definition value value instruction
<mode> whether turn on server mode 0 turn off server mode
1 turn on server mode
<port> port number default value is 333
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 32 of 48
5.3.8 Module receives data from server：+IPD and+RECEIVE
The command URC（Unsolicited Result Code） is sent by module to serial port. When module receives network data it sends data
which uses +IPD and RECEIVE as header to serial port.
Grammatical rules：
command
type
grammar Response and instruction
When
non-transpar
ent
transmission
when single way connect
(+CIPMUX=0)
+IPD,<len>:<data>
When single way, received data will take +IPD as beginning.
when multi-way connect
(+CIPMUX=1)
+RECEIVE,<id>,<len>:
<data>
<data> is received data, there is one \r\n between it and +RECEIVE,
<n>,<length>:
Note: Colon is English colon.
When
transparent
transmission
<data>
There is no data head, data come up directly when it is transparent
transmission.
Note:
Transparent transmission ways for multiway connection are:
Every single data sent to module serial port will be automatically
sent to all connections under CONNECTED state by module.
Users can guarantee data’s pertinence by application layer’s
protocol.
Parameter definition：
parameter definition value value instruction
<id> Link No. 0~3 connected serial number
<len> <data> length
unit: byte
Note: The length is <data>’s length, not including data
head.
<data> burst
Example of data receiving(take data receiving “TEST123” for example：
Non-transparent transmission Transparent transmission
single way link +IPD,7:TEST123 TEST123
multilink +RECEIVE,1,7:
TEST123
TEST123(at every CONNECTED connection）
5.3.9 Select TCPIP application mode ：AT+CIPMODE
Grammatical rules：
command type grammar backward
set command AT+CIPMODE=<mode> OK
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 33 of 48
check command AT+CIPMODE? +CIPMODE: <mode>
OK
test command AT+CIPMODE=? +CIPMODE: (0-NORMAL MODE,1-TRANSPARENT MODE)
OK
parameter definition：
parameter definition value value instruction
<mode> TCPIP application mode 0 Non-transparent transmission mode, default mode.
1 transparent transmission mode
5.3.10 Save transparent transmission configuration：AT+CIPSCON
Grammatical rules：
command
type
grammar backward
set command AT+CIPSCON=<action> OK
check
command AT+CIPSCON
C:<id>,<protocol>,<ip>,<remotePort>,<localPort>
S:<id>,<localPort>,<timeout>
DATA_MODE:<mode>
OK
test command AT+CIPSCON=? +CIPSCON:(0,1)
OK
parameter definition：
parameter definition value value instruction
<action> Save/delete transparent
transmission parameter
1
Save transparent transmission parameter
Module enter transparent transmission after booting. Set up
connection according to data of C and monitor port according
to data of S.
0
delete transparent transmission parameter. Data of S and C is
deleted. Module quits transparent transmission mode at the
same time
<id> connection marking
<protocol> value instruction TCP
UDP
<ip> Ip address x.x.x.x
<remotePort> opposite port means server port
<localPort> local port To C, that is module’s local CLIENTport
To S，that is module’s loca SERVER port
<timeout> Server link to time-out
time 0~65535 Please refer to AT+CIPSTO. Default value is 180
<mode> Transparent transmission
mode
0 Common AT mode
1 Transparent transmission mode
example：
Command
（→）
/backward
example Explanation and instruction
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 34 of 48
（←）
→ AT + C W M O D E ?
← +CWMODE:1
OK
→ AT+CIPMODE=1
← OK
→ AT+CIPMUX=1
← OK
→ AT+CWJAP="ChinaNet-hXug","5qsqruiv"
← OK
→ AT+CIPSTART=0,"TCP","192.168.1.51",6800
← OK
0,CONNECT OK
→ AT+CIPSCON=1
← OK
→ AT+CIPSCON
← C:0,"TCP","192.168.1.51",6800,1793
C:1,"","", ,
C:2,"","", ,
C:3,"","", ,
S:0, ,
S:1, ,
DATA_MODE:1
OK
AT +C IPSTAT US
OK
STATE:IP STATUS
C:0,"TCP","192.168.1.51",6800,"CONNECTED"
C:1,"","",,"INITIAL"
C:2,"","",,"INITIAL"
C:3,"","",,"INITIAL"
Then reboot module.
Module will enter transparent transmission mode after reboot and automatically set up connection of
0,"TCP","192.168.1.51",6800,"CONNECTED"
5.3.11 Time-out time set for server disconnected automatically：AT+CIPSTO
command type grammar backward and instruction
set command AT+CIPSTO=<server timeout > OK
check command AT+CIPSTO? + CIPSTO:<server timeout>
OK
parameter definition：
parameter definition value value
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 35 of 48
<server timeout >
Use to set time-out time
for server automatically
disconnected.
0~65535
unit is 2s
Using this command to set up time-out time, server
will disconnect when times up.
0 is default value. Means initiatively disconnect.
Default value is 180.
5.3.12 Set TE-TA Baud rate：AT+IPR
Grammatical rules：
command
type
grammar backward and instruction
set
command AT+IPR=<rate> go back：
OK
check
command AT+IPR?
go back：
+IPR: <rate>
OK
test
command AT+IPR=?
go back：
+IPR: (<rate> value list)
OK
Items need
attention
When <rate> = 0, module self-adapt to baud rate. Two items need attention.
1. When main control serial port’s baud rate is set as non-115200, it needs input at least two ”AT” or ”at” at the
main control to boot the module. In this way module’s baud rate will be trained the same as main control. Only
when the main control ‘s serial port baud rate is the same as module’s, serial port can normally input output AT
command. There should be no more than 100ms between input “A” and “T”. There is no limitation between
two ”AT”.
2. When main control’ s serial port baud rate is set as 115200, input command AT directly will be responded as it is
at the self-adapted baud rate state.
parameter definition：
parameter definition value value instruction
< rate > Baud rate
unit: bps
0 self-adapt to baud rate
2400
4800
9600
14400
19200
28800
38400
57600
115200
230400
460800
921600
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 36 of 48
5.3.13 Select non-transparent transmission data sending mode：AT+CIPQSEND
Under non-transparent transmission data sending mode, there are two sending modes quick sending and slow sending also,
using +CIPQSEND to set up.
Grammatical rules：
command type grammar Backward
set command AT+CIPQSEND=<n> OK
check command AT+CIPQSEND?
+CIPQSEND: <n>
OK
test command AT+CIPQSEND=?
+CIPQSEND: (0,1)
OK
parameter definition：
parameter definition value value instruction
<n>
non-transparent
transmission
mode
0 Common mode, also called slow sending mode—when server receives TCP
data, module goes back to SEND OK.
1
Quick sending mode—when data sent to module, module goes back
single way link：DATA ACCEP:<length>
multilink：DATA ACCEPT:<id>,<length>
but not SEND OK
5.3.14 Quit transparent transmission mode: + + +
There are 3 ways to quit under transparent transmission mode:
1) + + + quit transparent transmission, but it will go back to transparent transmission mode after rebooting.
2) + + +, then AT+CIPSCON=0, it will go back to non-transparent transmission mode after rebooting
module.
3) At setting transparent transmission mode option page of AirM2M_ESP8266_CONFIG_TOOL ，WEB
CONTROL->, set to 0 and then POST. Enter non-transparent transmission mode after rebooting module.
There are 2 ways to enter transparent transmission mode:
1) AT+CIPMODE=1，AT+CIPSERVER to configure server or AT+CIPSTAR to configure client side.
AT+CIPSCON=1, reboot module and then enter transparent transmission, and automatically set up
connection according to last saved data AT+CIPSCON=1.
2) At setting transparent transmission mode option page of AirM2M_ESP8266_CONFIG_TOOL ，WEB
CONTROL->, set to 0 and then POST. At setting TCPUDP client side/server option page to configure
CLIENT/SERVER, and then POST, reboot module to enter transparent transmission and automatically
set up connection according to configuration.
Grammatical rules：
Command type grammar backward
execute
command +++ Attention：+++ no other character at front or back
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 37 of 48
5.3.15 Application example
Module can work as STATION on WIFI level, also can work as AP, and AP+ STATION. Module can work as SERVER on
transmission level. While on application level, it can work as non-transparent data transmission and transparent data
transmission also.
Examples：
command
（→） /
backward
（←）
example explanation and demonstration
1）Module works in STATION mode（mode=1）：
The following words in light blue are the same common premise steps in this mode：
→ AT+CWMODE? Step1: check WIFI level working mode
← +CWMODE::3
OK
Default mode is 3: AP+STA mode
→ AT+CWMODE=1 Step2: Set as Station mode
← OK
→ AT+RST Step3: Need reboot after setting operation
mode.
← OK
Note: Step2 and Step 3 can be ignored if
after booting AT+CWMODE? is already
Step 1.
→ AT+CWLAP Step 4: check current available access point
← +CWLAP:(3,"yh_taihdhad",-45,"54:e6:fc:52:36:e6",9)
+CWLAP:(4,"lemon",-86,"6c:e8:73:69:4b:76",10)
+CWLAP:(4,"Xiaomi_yu",-85,"8c:be:be:2c:46:ea",11)
OK
search result
→ AT+CWJAP="yh_taihdhad","UUU02339" Step 5: add into one AP
←
OK
Note: After finishing this step, it will
automatically save the original mode after
module reboot. It will be STA also if it is
STA mode before reboot, and
automatically add in hot spots of before
reboot.
1.1）Module work as CLIENT, single way connection, non-transparent transmission：
→ AT+CIPSTATUS Check current WIFI connected status
← OK
STATE:IP STATUS
Already joined up AP.
→ AT+CWJAP?
Check current joined AP.
← +CWJAP:"yh_taihdhad"
OK
→ AT+CIFSR Check current module IP address
← 172.168.1.114
→ AT+CIPSTART="TCP","172.168.1.119",4321 Set up one TCP link
← OK
← CONNECT OK Means connection success.
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 38 of 48
→ AT+CIPSEND=5
Set sending length to 5, module will
automatically send data after data up to 5
ones.
→ >hello
After > comes up, send 5 characters hello to
serial port, module will automatically send
data.
← SEND OK means sending is successful
← +IPD,14:hello,thisispc Module receives server’s data and send to
serial port directly.
→ AT+CIPCLOSE Turn off connection
← OK
1.2）Module work as CLIENT, single way connection, data transparent transmission：
→ AT+CIPMODE=1 set module to transparent transmission mode
← OK
→ AT+CIPSTART="TCP","172.168.1.119",4321 connect to one server
← OK
← CONNECT OK means connection is successful
→ AT+CIPSCON=1 Save parameter(link parameter and
transparent transmission mode)
← OK
→ AT+CIPSEND
Enter transparent transmission.
Enter transparent transmission directly
without reboot.
←
>
After enter AT+CIPSEND, it will go back
to >, then upper computer can send data to
module from serial port, module can
automatically send out data.
←
SSSSAAAAAAAA
After server sending “SSSSAAAAAAAA”,
module will display directly. Note: No data
head when received by transparent
transmission.
→
Reboot module
Module will enter transparent
transmission directly after reboot and
set up connection according to
"TCP","172.168.1.119",4321.
→
+++
quit transparent transmission state
Note: there should be no character in
front or behind +++.
→ AT+CIPSCON Inquire transparent transmission
parameter and state
← C:0,"TCP","172.168.1.119",4321,1793
C:1,"","", ,
C:2,"","", ,
C:3,"","", ,
S:0, ,
S:1, ,
DATA_MODE:1
OK
Inquire result is status and parameter of
the last time when AT+CIPSCON=1.
→ AT + C IP S TAT U S
← OK
STATE:CONNECT OK
C:0,"TCP","172.168.1.119",4321,"CONNECTED"
C:1,"","",,"INITIAL"
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 39 of 48
C:2,"","",,"INITIAL"
C:3,"","",,"INITIAL"
→ AT+CIPMODE=1
← OK
→ Reboot module. Reenter transparent transmission after reboot
and set up one connection automatically. Connection parameter
is the same as saved last time.
1.3）Module work as CLIENT, single way connection, data transparent transmission.
→ AT+CIPMUX=1 After CIPMUX=1, module can do
transparent transmits only.
← OK
→ AT+CIPMODE=1 Transparent transmission mode
← OK
→ AT+CIPSTART=0,"TCP","172.168.1.119",4321 This is outer net server.
← OK
CONNECT OK
→ AT+CIPSCON=1 Save parameter(connect parameter and
transparent transmission mode)
← OK
Reboot module. Reenter transparent transmission after reboot
and set up two connections automatically. Connection parameter
is the same as saved last time when +CIPSCON .
1.4) Module work as SERVER, multi-way connection, non-transparent transmission.
→ AT+CIPMUX=1
← OK
→ AT+CIPSERVER=1,8800 Module works as SERVER
← OK
configuration is successful,
Can monitor TCP and UDP link at the same
time
→ AT+CIPSTATUS
← OK
STATE:IP STATUS
S:0,8800,LISTENING
C:0,"","",,"INITIAL"
C:1,"","",,"INITIAL"
C:2,"","",,"INITIAL"
C:3,"","",,"INITIAL"
← 0,CONNECT OK CLIENT link to module (TCP)，linkid = 0
←
1,CONNECT OK
CLIENT link to module (UDP)，linkid = 1
Note: No matter TCP or UDP, 4 links can
be set up most.
→ AT+CIPSTATUS Inquire TCPIP level status
← OK
STATE:IP STATUS
S:0,8800,LISTENING
C:0,UDP,192.168.2.112,65074,CONNECTED
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 40 of 48
C:1,TCP,192.168.2.112,50114,CONNECTED
C:2,"","",,"INITIAL"
C:3,"","",,"INITIAL"
← +RECEIVE,0,10：
0123456789
Receive data from CLIENT，content is：
0123456789
→ AT+CIPSEND=0,6
← > Now data can be input. Input 6 characters,
data will send initiatively.
← 0,SEND OK Data sending successfully.
← 0,CLOSE OK Opposite terminal （CLIENT ） break
connection initiatively.
→ AT+CIPSERVER=0
← OK
we must restart
Need reboot module after shut down server.
1.5）Module works as SERVER, single way and multi-way connection, data transparent transmission.
→ AT+CIPMUX=1
← OK
→ AT+CIPSERVER=1,8800 Module works as SERVER
← OK
Configuration is successful.
can monitor TCP and UDP connection at the
same time
→ AT+CIPMODE=1
← OK
→ AT+CIPSCON=1
← OK
Enter transparent transmission mode after reboot. And wait for
setting up CLIENT connection. There will be nothing reminder
after connection set up successfully. Now data can be two-way
transmitted.
模块作为SERVER可最多同时监听4条链接
（TCP+UDP)
2）Module operates in AP mode：
The following words in light blue are the same common premise steps in this mode:
→ AT+CWMODE? Step 1: check WIFI level operation mode
← +CWMODE::3
OK
Default mode is 3: AP+STA mode +CWMODE:
OK
→ AT+CWMODE=2 Ste[ 2: Set as AP mode
← OK
→ AT+RST Step 3: Need reboot after setting mode.
←
OK
Note: Step2 and Step 3 can be ignored
if after booting AT+CWMODE it is
already Step 1.
→ AT+CWSAP="aptest","123456",1,0 Step4: Set mode to AP and configure AP
parameters.
←
OK
Note: After finishing this step, it will
automatically save the original mode after
module reboot. It will be AP also if it is AP
mode before reboot, and keeps the same
AP parameters (SSID, password and so on)
as before reboot.
STATION join uo aptest AP
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 41 of 48
2.1）CLIENT，single way connection, non-transparent transmission data：
Please refer to 1.1) partial examples
2.2）CLIENT，single way connection, transparent transmission data：
Please refer to 1.2) partial examples
2.3）SERVER，multi-way connection, non-transparent transmission data：
Please refer to 1.3) partial examples, different part is all
connections are internet connection under this application.
2.4) SERVER，multi-way connection, non-transparent transmission data：
Please refer to 1.4) partial examples
2.5) SERVER，single way and multi-way connection, transparent transmission data：
Please refer to 1.5) partial examples
3）Module work in AP+STATION mode ：
The following words in light blue are the same common premise steps in this mode：：
→ AT+CWMODE=3 Set as AP + STA mode
← OK
→ AT+RST Need reboot after configuring mode.
← OK
→ AT+CWJAP="yh_taihdhad","UUU02339" Add into one AP which is a router can access
outer net.
← OK
→ AT+CWSAP="aptest","123456",1,0 Configure module as （name as aptest），and
configure AP parameter
← OK
There is one computer(name as user) using WIFI to join this
aptest AP.
→ AT+CIPMUX=1 Start multi-way connection mode
← OK
→ AT+CIPSTART=1,"TCP","120.209.197.145",8000 Set up TCP connection with one SERVER of
outer net. Connection number is 1.
← OK
1,CONNECT OK
Successfully connect to outer net SERVER.
3.1) Module works as CLIENT to link local server, meanwhile works as CLIENT to link outer net server.
→ AT+CIFSR
← 192.168.4.1
192.168.2.110
OK
192.168.2.110 is the allocated IP address
when joins router which can surf outer net.
192.168.4.1 is the IP address and module
works as AP itself.
→ AT+CIPSTART=2,"TCP","192.168.4.100",7777 To set up one connection with USER’s
server, connection number is 2.
← OK
2,CONNECT OK
← +RECEIVE,2,11：
hhhhhhfdddd
receive one pack of data from USER
→ AT+CIPSEND=1，11 Receive data from USER’s server (link 2) and
send to outer net’s server (link 1)
← > input hhhhhhfdddd
← 1,SEND OK When character’s number is up to 11, it will
send out by itself.
3.2）Besides linking to outer net’s server, module also works as CLIENT to link local server, service including: multi-way
link and transparent transmission.
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 42 of 48
→ AT+CIPSTART=2,"TCP","192.168.4.100",7777 To set up one connection with USER’s
server, connection number is 2.
← OK
2,CONNECT OK
→ AT+CIPMODE=1
← OK
→ AT+CIPSCON=1
← OK
Reboot module. Module will enter transparent transmission after
reboot and automatically sets up 1 and 2 connections at the same
time.
→ +++
→ AT+CIPSTATUS Linking status can be checked after quiting
transparent transmission mode
← STATE:IP STATUS
C:0,"","",,"INITIAL"
C:1,"TCP","120.209.197.145",8000,"CONNECTED"
C:2,"TCP","192.168.4.100",7777,"CONNECTED"
C:3,"","",,"INITIAL"
3.3 Besides linking to outer net’s server, module also works as server to monitor local connection, service including:
multi-way link and non- transparent transmission.
→ AT+CIPSERVER=1,3366
← OK
← 0,CONNECT OK
Working as CLIENT, USER set up one UDP
connection joining up module’s AP,
linking number is 0.
← 2,CONNECT OK
Working as CLIENT, USER set up one TCP
connection joining up module’s AP, linking
number is 1.
→ AT+CIPSEND=0,8
← > After input 12345678, then data can send out
by itself.
← 0，SEND OK
→ AT+CIPSTATUS
Inquire TCPIP status
← OK
STATE:IP STATUS
S:0,3366,LISTENING
C:0,UDP,192.168.4.100,51733,CONNECTED
C:1,TCP,120.209.197.156,8000,CONNECTED
C:2,TCP,192.168.4.100,57957,CONNECTED
3.4）Besides linking to outer net’s server, module also works as server to monitor local connection , service including:
multi-way link and transparent transmission.
→ AT+CIPSERVER=1,3366
← OK
→ AT+CIPMODE=1
← OK
→ AT+CIPSCON=1
← OK
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 43 of 48
Reboot module. It will enter transparent transmission mode
automatically and set up connection
1,"TCP","120.209.197.145",8000. Module works as SERVER at
the same time to monitor port 3366, waiting for setting up
connection.
FCC Caution: Any changes or modifications not expressly
approved by the party responsible for compliance could void the user's
authority to operate this equipment.
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions: (1) This device may not
cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
This device and its antenna(s) must not be co-located or operating in conjunction
with any other antenna or transmitter.
This equipment should be installed and operated with minimum distance 20cm
between the radiator and your body.
15.105 Information to the user.
(b) For a Class B digital device or peripheral, the instructions furnished the
user shall include the following or similar statement, placed in a prominent
location in the text of the manual:
Note: This equipment has been tested and found to comply
with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses and
can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
—Reorient or relocate the receiving antenna.
—Increase the separation between the equipment and receiver.
—Connect the equipment into an outlet on a circuit different from that to which
the receiver is connected.
—Consult the dealer or an experienced radio/TV technician for help.
AirM2M_ESP8266_WiFi module user's manual V2.3
Shanghai AirM2M Communication Technology Co., Ltd http://www.airm2m.com Page 44 of 48
Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an
uncontrolled environment.
This transmitter must not be co-located or operating in conjunction with any other
antenna or transmitter.
The availability of some specific channels and/or operational frequency bands
are country dependent and are firmware programmed at the factory to match
the intended destination.
The firmware setting is not accessible by the end user.
The final end product must be labelled in a visible area with the following:
“Contains Transmitter Module 2AEGGA6501”
”