Ebyte E103-W03 User manual

E103-W03 Instruction Manual
CC3220R 2.4GHz WiFi serial port module

Chengdu Ebyte Electronic Technology Co., Ltd. E103-W03 _User Manual _EN_V1.1
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd.
CONTENTS
CHAPTER 1 OVERVIEW ............................................................................................................................. 1
1.1 INTRODUCTION .......................................................................................................................................................................................1
1.2 FEATURES .................................................................................................................................................................................................1
CHAPTER 2 SPECIFICATIONS ................................................................................................................... 3
2.1 LIMIT PARAMETERS............................................................................................................................................................................... 3
2.2 WORKING PARAMETERS ....................................................................................................................................................................... 3
2.3 ELECTRICAL PARAMETERS...................................................................................................................................................................3
2.4 ELECTRICAL CHARACTERISTICS ......................................................................................................................................................... 4
CHAPTER 3 MECHANICAL DIMENSIONS AND PIN DEFINITIONS ...................................................... 5
CHAPTER 4 RECOMMENDED CONNECTION DIAGRAM ...................................................................... 7
CHAPTER 5 FUNCTION DESCRIPTION .................................................................................................... 8
5.1 JOB ROLES ............................................................................................................................................................................................... 8
5.1.1 Access Point (AP mode) .............................................................................................................................................................. 8
5.1.2 Station (STA mode) ....................................................................................................................................................................... 8
5.1.3 WiFi Direct (P2P mode) ..............................................................................................................................................................8
5.2 TRANSMISSION MODE ........................................................................................................................................................................... 8
5.2.1 Transparent transmission ............................................................................................................................................................9
5.2.2 Protocol Transmission ................................................................................................................................................................. 9
5.3 SERVICE MODE .................................................................................................................................................................................... 10
5.3.1 TCP server ....................................................................................................................................................................................10
5.3.2 TCP client .....................................................................................................................................................................................10
5.3.3 UDP ............................................................................................................................................................................................... 10
5.3.4 MQTT ............................................................................................................................................................................................ 11
5.3.5 HTTP Client .................................................................................................................................................................................11
5.3.6 WebSocket .....................................................................................................................................................................................11
5.4 PARAMETER CONFIGURATION ........................................................................................................................................................... 12
5.4.1 Serial port AT configuration ....................................................................................................................................................12
5.4.2 UDP remote configuration .......................................................................................................................................................12
5.4.3 Browser-based web page configuration ................................................................................................................................12
5.5 STATUS INDICATION .............................................................................................................................................................................12
5.6 LOW POWER CONSUMPTION ..............................................................................................................................................................13
5.7 SERIAL PORT 3M HIGH-SPEED SENDING ......................................................................................................................................... 13
5.8 HEARTBEAT PACKAGE,REGISTRATION PACKAGE ..........................................................................................................................13
5.9 MODBUS PROTOCOL ........................................................................................................................................................................... 13
5.10 STATIC IP.............................................................................................................................................................................................14
5.11 RESTORE FACTORY PARAMETERS OF PINS ....................................................................................................................................14
5.12 SCAN NEARBY AP INFORMATION .................................................................................................................................................. 14
5.13 DEFAULT PARAMETERS .................................................................................................................................................................... 14
CHAPTER 6 TUTORIAL .............................................................................................................................16
6.1 BASIC TCP/UDP DATA TRANSMISSION .......................................................................................................................................... 16
6.1.1 Communication with PC ...........................................................................................................................................................16
6.1.2 Communication between modules ..........................................................................................................................................23
6.2 NETWORK COMMUNICATION .............................................................................................................................................................28

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6.2.1 MQTT ............................................................................................................................................................................................ 28
6.2.2 HTTP Client .................................................................................................................................................................................31
6.2.3 WebSocket .....................................................................................................................................................................................32
6.3 PARAMETER CONFIGURATION ........................................................................................................................................................... 32
6.3.1 Serial port AT command configuration .................................................................................................................................32
6.3.2 UDP remote configuration .......................................................................................................................................................33
6.3.3 Web page configuration ............................................................................................................................................................ 33
6.4MODBUS USAGE ....................................................................................................................................................................................34
6.5 STATIC IP USAGE ..................................................................................................................................................................................35
CHAPTER 7 REVISION HISTORY ............................................................................................................ 35
ABOUT US ................................................................................................................................................... 35

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1
Chapter 1 Overview
1.1 Introduction
E103-W03 is an ultra-low power serial port to Wi-Fi module, SMD small-volume
package, PCB antenna, working in the 2.4~2.484GHz frequency band. The module
can use the serial port to send and receive data, lowering the threshold of wireless
applications.
The E103-W03 module is developed by Chengdu Ebyte Electronic Technology Co.,
Ltd. based on TI's CC3220R chip. The module integrates the transparent
transmission function, which can be used out of the box and supports the serial port
AT command set. Users can use the network access function through the serial port. It is widely used in wearable devices,
home automation, home security, personal health care, smart home appliances, accessories and remote controls,
automotive, lighting, industrial Internet and other fields.
E103-W03 module supports standard IEEE802.11b/g/n protocol and complete TCP/IP protocol stack, supports STA/AP
network role, supports multiple network working modes, supports SmartConfig, serial port transparent transmission,
power-on transparent transmission and other functions , after a simple configuration, the network access function can be
realized very conveniently, minimizing the developer's work and project development time.
1.2 Features
Support IEEE802.11 b/g/n standard;
Support AP, STA, WIFI Direct 3 working modes
Support WEP/WPA/WPA2 multiple WIFI security authentication methods;
Support TCP/UDP/HTTP/MQTT multiple network communication protocols;
Support TSL/SSL secure transmission mode;
Support up to 4 Socket connections;
AP access point supports 4-way STA device connection;
Support mDNS, DNS-SD, DHCP network service package;
Support WEB page parameter configuration;
Support NTP network time acquisition (under the premise of Internet access);
Support disconnection automatic reconnection;
Support high-speed transmission, the highest support serial port 3M baud rate transmission;
Support multiple power consumption mode switching;
Support WIFI idle connection (LDPS);
Support MQTT network protocol (Alibaba Cloud, Baidu Cloud, OneNet)
Support WebSocket connection;
Support HTTP Client

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Support TCP SERVER, TCP CLIENT, UDP communication mode;
Support custom registration package, custom heartbeat package function;
Support socket distribution protocol;
AT command configuration;
Support remote command configuration;
Support Smartconfig fast distribution network;
Support transparent multi-channel protocol transmission and broadcast transmission;
Support pins to restore default parameters
Support modebus protocol conversion (RTU and TCP)
Support static IPv4 address allocation
Support scanning nearby AP information

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Chapter 2 Specifications
2.1 Limit parameters
Main Parameters
Performance
Remark
Min. Value
Max. Value
Power supply voltage (V)
0
3.6
Exceeding 3.6V will permanently burn the module
Blocking power (dBm)
-
10
Less chance of burning when used at close range
Working temperature (℃)
-40
+85
Industrial Grade
2.2 Working parameters
Main Parameters
Performance
Remark
Min.
Typic
al
Max.
Working voltage (V)
2.3
3.3
3.6
Recommended 3.3V power supply
Communication level (V)
3.3
-
Working temperature (℃)
-40
-
+85
Industrial Design
Working frequency band (Hz)
2.412
G
2.442
G
2.472
G
2.4G frequency band
Power
Consumpti
on
Maximum transmit power
(dBm)
17
18
18.5
Test 2.412GHz
Maximum emission current
(mA)
257m
A
260m
A
268m
A
Instantaneous power consumption, DSSS 1Mbps, 3.3V
power supply
Receive current (mA)
-
78mA
-
Received average power consumption (2.412GHz)
Sleep current (μA)
-
12uA
-
Sleep. SOP1 floating or pulled low
2.3 Electrical parameters
No.
Parameter Name
Parameter Value
Note
1
RF chip
CC3220R
TI
2
Module Size
27 * 19 * 2.7mm
3
Average Weight
2.2g
4
PCB technology
4 layers
Impedance debugging
5
Working frequency
2.4 ~ 2.484 GHz
6
Production Process
Lead-free process,
machine-mounted
Wireless products must be machine-attached to ensure batch consistency
and reliability
7
Interface
1.27mm
SMD
8
Supply Voltage
2.3 ~ 3.6V DC
Note: Voltage higher than 3.6V will cause permanent damage to the

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module
9
communication level
maximum 3.6
Recommended to be less than 0.3V from supply voltage to reduce power
consumption
10
Measured distance
160m
Module to module communication, clear and open, maximum power,
height 2m, PCB antenna
180m
The module communicates with the mobile phone, clear and open,
maximum power, height 2m, PCB antenna
11
Transmit power
18dBm
about 100mW
12
AT support
Built-in intelligent
processing
Configuration parameters can be set or read through AT commands
13
Wi-Fi version
802.11 b/g/n
14
Communication Interface
UART serial port
15
Antenna form
PCB Onboard
Antenna/IPX Socket
50Ω characteristic impedance, can be changed by yourself
16
Operating temperature
-40 ~ +85℃
Industrial grade (chip range, please modify according to crystal
parameters)
17
Working humidity
10% ~ 90%
relative humidity, non-condensing
18
Storage temperature
-40 ~ +85℃
Industrial grade
2.4 Electrical characteristics
Parameter
Min. Value
Typical value
Max. Value
Unit
Storage temperature range
-40
normal
temperature
85
℃
working voltage
2.3
3.3
3.6
V
Any IO
VIL/VIH
-0.5/0.65VDD
-
0.35VDD/VDD+0.5
V
VOL/VOH
N/2.4
-
0.4/N
IMAX
-
-
3.5
mA

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Chapter 3 Mechanical Dimensions and Pin Definitions
Pin number
Pin definition
I/O
Function and Instructions
1、8、9、11、12、13、
16、17、28、29、44
GND
power ground
2
GPIO26
IO
Common IO port
3
GPIO27
IO
Common IO port
4
RST
I
Module reset pin, low level reset, low level duration greater than or equal
to 2ms.
5
SOP2
I
Programming emulation mode selection. The SOP2 pin has a built-in
2.4K pull-down resistor; when in use, an external pull-up resistor 100R is
required to pull the pin level high. Normal operation is low.
6
SOP1
I
Programming emulation mode selection. When in use, an external
pull-up resistor 1M is required to pull the pin level high. Normal
operation is low.
7
SOP0
I
Programming emulation mode selection. The SOP0 pin has a built-in
100K pull-down resistor; when in use, an external pull-up resistor 10K is
required to pull the pin level high. Normal operation is low.
10
VCC
Device power supply VDC: 2.4V~3.6V (above 300mA)

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14
GPIO31
IO
Common IO port
15
GPIO0
IO
Common IO port
18
GPIO30
IO
Common IO port
19
GPIO1
O
UART serial port output pin, support AT command
20
GPIO2
I
UART serial port input pin, support AT command
21
GPIO3
IO
Common IO port
22
GPIO4
IO
Common IO port
23
GPIO5
IO
Common IO port
24
GPIO6
IO
Common IO port
25
GPIO7
IO
Common IO port
26
GPIO8
O
Abnormal indicator light INDICATE, abnormal output low, normal
output high.
27
GPIO9
O
Wifi connection status indicator, connected output is low, not connected
output is high.
30
GPIO10
O
Network connection status indicator, the connected output is low, and the
unconnected output is high
31
GPIO11
O
Smartconfig status indicator, low when entering the state, high when not
entering the state
32
GPIO12
I
Restore factory settings pin, active low. Keep low level for 3 seconds or
more when power on. No need to reboot again.
33
GPIO13
I
WAKEUP wakeup pin
34
GPIO14
IO
Common IO port
35
GPIO15
IO
Common IO port
36
GPIO16
IO
Common IO port
37
GPIO17
IO
Common IO port
38
GPIO22
IO
Common IO port
39
GPIO28
IO
Common IO port
40
TDI
I
JTAG emulation pin
41
TDO
O
JTAG emulation pin
42
TCK
I
JTAG emulation pin
43
TMS
IO
JTAG emulation pin

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Chapter 4 Recommended Connection Diagram
Notice:
1. The power supply must be guaranteed at 2.3V~3.6V. In order to ensure the stable operation of the module, the
RF transmission power will be affected by factors such as the response speed of the LDO. If there is a high requirement
for the communication distance, it is recommended to select an external LDO with a power supply capacity greater than
600mA powered by.
2. The RXD/TXD of E103-W03 are respectively connected to the MCU_TXD/MCU_RXD of the external MCU.
3. When powering on, the SOP1 pin needs to be connected to a 1M pull-up resistor, and SOP0 and SOP2 are
connected to a pull-down resistor (the module has already connected SOP0 and SOP2 to the pull-down resistor, so it will
not be processed here). Otherwise it will not work properly.
4. If secondary development is required, the connection mode of SOP0, SOP1, and SOP2 pins is also recommended
to be 010. For other modes, please refer to the relevant development manual of CC3220R and choose the mode by
yourself.
5. If there is a high requirement for low power consumption, it is recommended to cancel the pull-up of SOP1 and
connect it to the IO port of the microcontroller. It only needs to pull the module high at the moment of power-on, and pull
SOP1 low after the module works normally. At this time, the sleep current can be reduced by about 3.3uA when the
power consumption is low.

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Chapter 5 Function Description
The working mode of this module is divided into three levels: working role; transmission mode; service category.
From the perspective of the role of the WiFi layer, it can be divided into Access Point, which is commonly referred to as
an AP access point, Station, which is commonly referred to as a station, and WiFI-Direct is also called P2P or WiFi direct
connection;
In terms of transmission mode, it is divided into single-mode transparent transmission and protocol transmission;
From the service category, it is divided into TCP Server, TCP Client, UDP, MQTT, HTPP client.
5.1 Job roles
Job roles are defined based on the perspective of the WiFi physical layer.
5.1.1 Access Point (AP mode)
Access Point, referred to as AP mode, is similar to a router, allowing wireless devices to connect and establish server,
client, and UDP communications based on TCP/IP. In this mode, 4 stations are supported, and a maximum of 4 Tcp
socket transmissions are supported. The command AT+MODE=1,x,x sets the first bit to 1 to configure the module to
work in the role of AP.
5.1.2 Station (STA mode)
The Station mode is referred to as STA. The module under this role does not provide connection, but can only be
connected to Access Point or router. This module under the role of Station supports TCP server, TCP client, UDP, and
supports a maximum of 4 sockets. MQTT, WebSocket, HTTP clinet are also supported. The instruction AT+MODE=2,x,x
sets the first bit to 2, to configure the module to work in the STA role.
5.1.3 WiFi Direct (P2P mode)
WiFi Direct mode is a way to directly establish a point-to-point connection without routing, also called P2P, which is
similar to Bluetooth but the transmission rate is significantly higher than Bluetooth. The instruction AT+MODE=3,x,x
sets the first digit to 3 to configure the module to work in WiFi Direct mode.
There are two roles in P2P mode: Client; GroupOwner.
5.2 Transmission mode
To be precise, the transmission mode refers to the number of sockets supported by the module under the TCP/IP protocol.
When only one socket is supported, we define it as single-mode transparent transmission, and when it supports multiple
sockets, we define it as protocol transmission. It should be noted that the transmission mode parameter does not take

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effect for WiFi-Direct.
5.2.1 Transparent transmission
Transparent transmission means that when only one socket is supported, data from either the serial port or the network is
sent directly without any format. Instruction AT+MODE=x.1,x sets the second bit to 1 to configure the module to work in
transparent transmission mode.
5.2.2 Protocol Transmission
When multiple sockets are supported, in order to distinguish the source and destination of data, we define it as protocol
transmission, which includes designated sending and broadcast sending.
5.2.2.1 Specified sending
The specified sending means that the data packet input to the serial port contains a unique socked ID number, and the
module transmits the data to the corresponding socket connection according to this ID number.
Fixed head
Socket ID
Data
3 Byte
1Byte
N Byte
Fixed head：0xAA 0xFE 0x55
Socket ID：
0x00, representing the discovery of Socket 0 link
0x01, representing the discovery of Socket 1 link
0x02, representing the discovery of Socket 2 link
0x03, representing the discovery of Socket 3 link
Data：Application Payload
For example: AA FE 55 00 AA BB CC In protocol transmission mode, send AA BB CC to Socket 0 through the serial
port
5.2.2.2 Broadcast sending
When the Socket ID is 0xff, it means broadcasting. If 4-way connections are established, the data will be sent to the
4-way sockets at the same time, otherwise, the data will be sent to the established connections.
5.2.2.3 Protocol reception
Fixed head
Socket ID
Length
Data
3 Byte
1Byte
2Byte
N Byte

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Fixed head:
0xAA 0xFE 0x55
Socket ID：
0x00, representing the discovery of Socket 0 link
0x01, representing the discovery of Socket 1 link
0x02, representing the discovery of Socket 2 link
0x03, representing the discovery of Socket 3 link
Length：
Application data actual length value, range: 0~1000
Data：
Application Payload
For example: AA FE 55 00 00 03 11 22 33 In protocol mode, the 3-byte data received from Socket0 contains: 0x11
0x22 0x33
Use the command AT+MODE=x.2,x to set the second bit to configure the module to work in the protocol
transmission mode.
5.3 Service Mode
The service mode refers to the network protocol supported by the module and the role of the module under the network
protocol, that is, the server (server) and client (client), which are often referred to as server (server) and client (client).
Here, UDP, MQTT, HTTP client, WebSocket, etc. are all included to this mode. Note that the service mode has no effect
on the WiFi-Direct(P2P) role. Service mode includes the following.
5.3.1 TCP server
Let the module work as a TCP server. Use the command: AT+MODE=x,x,1 to set the third bit to configure the module to
work in TCP server mode.
5.3.2 TCP client
Let the module work as a TCP client. Use the command: AT+MODE=x,x,2 to set the third bit to configure the module to
work in TCP client mode.
5.3.3 UDP
In UDP mode, there is no distinction between server and client. Use the command: AT+MODE=x,x,3 to set the third bit
to configure the module to work in UDP mode. In addition, there is no concept of connection in UDP mode, so the
S_LINK pin will not be operated in the status indication.

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5.3.4 MQTT
In the MQTT mode, the module supports Alibaba Cloud, Baidu Cloud, OneNet and other IoT platforms. Enter the service
parameters created on the platform into the module to communicate.
5.3.4.1 Alibaba Cloud
For network communication based on the Alibaba Cloud platform, you need to log in to Alibaba Cloud to obtain relevant
parameters, which mainly include product key, device name, client ID and other information. For details, see Chapter 7
Alibaba Cloud Configuration Tutorial.
5.3.4.2 Baidu Cloud
For network communication based on Baidu Cloud platform, you need to log in to Baidu Cloud to obtain relevant
parameters, mainly including device name, user name, password, etc. For details, see Chapter 7 Baidu Cloud
Configuration Tutorial.
5.3.4.3 Onenet
For network communication based on the OneNet cloud platform, you need to log in to OneNet to obtain relevant
parameters, mainly including device ID, product ID, authentication information, etc. For details, see Chapter 7 OneNet
Configuration Tutorial.
5.3.5 HTTP Client
When using this function, you only need to configure the corresponding server resource symbol URL, and start a trigger
request to obtain the resource that the server responds to. You don't need to care about the complicated HTTP protocol
layer. For details, see Chapter 6 HTTP Client Configuration Tutorial.
5.3.6 WebSocket
The traditional HTTP transmission protocol is based on access and response. In this way, the server is always passive and
cannot be applied to the application where the web client and the WEB server frequently interact. The application of the
WebSocket function allows the E103-W03 module to communicate through the serial port. Real-time interaction with the
webpage saves the GET and POST request process initiated by the HTTP client during multiple interactions, improves
the response speed, and the module side can actively push data to the webpage. See Chapter 7 WebSocket Configuration
Tutorial for details.

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5.4 Parameter configuration
There are three ways to configure parameters: AT command configuration based on serial port, remote AT configuration
based on UDP, and web page configuration based on browser. For detailed operation, see Chapter 6 AT Command
Description and Chapter 7 Tutorial.
5.4.1 Serial port AT configuration
When you need to use the serial port AT command to configure parameters, first send "+++" to enter the AT mode, and
then operate according to the AT command in Chapter 6. After the configuration is completed, some commands will take
effect immediately, and some commands will take effect after restarting. According to the instructions in the AT
command chapter prevail. To exit AT mode, send command: AT+EXIT. Sending "+++" command at any time will enter
AT mode. But AT+EXIT can only be used in AT mode, otherwise it is used as transmission data.
5.4.2 UDP remote configuration
UDP remote configuration is parameter configuration performed under the same network using network debugging tools,
which can also be called air configuration. There are two ways to enter remote configuration: when the module is in AP
mode, the PC is connected to the module; when the module is in STA mode, the PC and the module are connected to the
same router. The module will always listen to a fixed UDP port 8009. When the module and the terminal are in the same
network, set the corresponding IP and port to configure parameters. Remote configuration must be in AP mode or STA
mode, after the network connection has been established. P2P mode does not support this function.
5.4.3 Browser-based web page configuration
The webpage configuration must ensure that the PC and the module are in the same LAN. There are two ways to enter
the webpage configuration: the module is connected to the module from the PC in AP mode; the module is in STA mode,
and the PC and the module are connected to a router. The PC accesses the IP address of the module through the browser,
and accesses the static web page for parameter configuration.
5.5 Status indication
Status indication is to display the working status of the module through serial port printing or pin output level status.
Serial port indication: print "Entered AT mode" when entering AT command, print "Exited AT mode" when exiting AT
command, print "ERR=x" when AT command is wrong, and return the set value if AT command is correct.
Pin indications include WiFi connection status indication, socket connection status indication and module abnormality
indication. When the WiFi connection is established, the W_LINK pin outputs a high level, and if the connection is
disconnected, the W_LINK pin outputs a low level. When the socket connection is established, S_LINK outputs a high
level, and if the connection is disconnected, S_LINK outputs a low level.
The INDICATE pin remains low when the module is working normally. If the INDICATE pin of the module outputs a
high level abnormally, the module needs to be restarted at this time.

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5.6 Low power consumption
The low power consumption of the module enables the module to enter the dormant state through command operation.
After entering dormancy, it can be woken up through the pin. The way of waking up is to give the WAKEUP pin (ie
GPIO_13) a rising edge, or the serial port receives data.
5.7 serial port 3M high-speed sending
Regarding high-speed transmission, you need to pay attention to the following issues:
1. The serial port chip must be a model that can support up to 3M baud rate. The test board of our company uses FT232
series
2. The serial port assistant software must be able to support up to 3M baud rate. The software used by our company for
testing is XCOM2.6
3. Try not to connect the module to the PC through the USB converter, but directly connect to the USB3.0 port of the
PC, otherwise it is easy to lose packets
4. The module can be connected with a computer or a mobile phone to achieve 3M speed transmission. However, when
the module is connected to the module, it may be necessary to reduce the baud rate of the sending end. The specific
reduction is limited by the influence of the connection distance and requires actual testing.
5.8 Heartbeat package, registration package
The heartbeat packet registration packet is a function only available in the TCP client mode. This module supports
custom heartbeat packet data and registration packet data content..
5.9 Modbus protocol
This module supports Modbus protocol, which can realize free conversion between RTU and TCP. When using it, you
only need to pass in data from the serial port, and the module will automatically recognize and convert it into data that
conforms to the Modbus specification, and upload it to the network. Or convert the received network end data into data
that conforms to the Modbus specification and output it from the serial port.
Note:
1. The Modbus supported by this module is only for data conversion and does not support actual functional
operation. If you need to use this part of the function, please cooperate with the actual PLC device.
2. If the Modbus function is turned on, the protocol transmission will be invalid, that is, the protocol transmission
is no longer data with a fixed format, and will be converted into data that conforms to the Modbus protocol
standard.
3. Only the TCP server, TCP client, UDP, MQTT, WebSocket and P2P modes support the Modbus protocol, and
the HTTP client does not support it. The reason is that the HTTP client is a short-connection communication
method, and the server cannot actively initiate data exchange.

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5.10 Static IP
In STA mode, it can support setting static IP, which is convenient for communication with fixed IP. It should be noted
that the static IP address must be in the same network segment as the target router or target AP, otherwise the IP cannot be
allocated and cannot work normally. For example, if the target AP address is 192.168.1.1, then the static IP address must
be set to 192.168.1.x. Otherwise, the IP address cannot be assigned normally, and the module cannot work. Static IP
related parameters can only be set or queried in STA mode, other modes do not support corresponding AT commands.
5.11 Restore factory parameters of pins
This module will only actively detect the level status of GPIO12 pin within 3 seconds when it is powered on, and if it is
low, the parameters will be restored to the factory default parameters. There is no need to restart when using it, and the
GPIO12 pin will be set to low level after the parameters are successfully restored.
5.12 Scan nearby AP information
When the module works in STA mode, you can use the AT command to scan the nearby AP information, if there is, print
the AP information through the serial port, the format is as follows:
Fixed head
SSID
MAC(BSSID)
channel
rssi
+scan:
Maximum 32
bytes
17 bytes
Maximum 3 bytes
Maximum 3 bytes
+scan:
TEST_ZW
14:AD:CA:AA:91:D6
4
-69
1. Scanning for nearby APs will only take effect in STA mode, when the connection mode is manual connection, and no
wifi connection is established, otherwise it will return ERR=-5, indicating that this operation is not supported in this
state.
2. Each parameter is separated by a comma ',' and ends with a carriage return (\r\n). MAC addresses (BSSID) are
separated by a semicolon ':'
3. The module can only scan the AP information in the 2.4G frequency band. The channel of 2.4G is [1,13].
4. A maximum of 30 AP information can be scanned at a time.
5.13 Default parameters
Parameter
category
Parameter name
Parameter value
Related instructions
Serial port
baud rate
115200
AT+UART
digit
8
stop bit
1
Parity
none
serial timeout
40（ms）
Serial frame length
1000
working frequency
2.4G

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RF
parameters
AT+RADIO
channel
1
transmit power level
0
CountryCode
CN
AP role
SSID
parameter
SSID
E103-W03
AT+SSID
Whether to hide SSID
0 (no)
encryption type
2（WPA2）
password
12345678
Operating
mode
job role
1
AT+MODE
transfer mode
1
service mode
1
Network IP
address
IP address
192.168.1.1
AT+NETIP
subnet mask
255.255.255.0
gateway address
192.168.1.1
server address
192.168.1.1
P2P
connection
parameters
P2P scanning gap
20
AT+P2PDEVINFO
P2P Role
0（client）
P2P local name
E103-W03WiFiDirectClient
P2P target name
E103-W03WiFiDirectGo
P2P socket
P2P port
4001
AT+P2PSOCKET
P2P address
192.168.1.1
STA
connection
parameters
Target SSID
E103-W03
AT+STACON
Encryption type
2
Password
ebyteW03
Connection Type
1
AT+CONTYPE
Local socket
parameters
Local port
4001
AT+SVRPORTIP
Local IP
192.168.1.1
Remote
socket
parameters
Socket1
Port
4001
AT+SOCKET
IP
192.168.1.1
Socket2
Port
4002
IP
192.168.1.1
Socket3
Port
4003
IP
192.168.1.1
Socket4
Port
4004
IP
192.168.1.1
Heartbeat
parameters
4
sockets
are the
same
Heartbeat type
0 (off)
AT+HEARTBT
Heartbeat
timeout
5 (unit: second)
Heartbeat data
type
1 (string)
Heartbeat data
CDEBYTE-E103-W03-STRHT
Registry
Package
Parameters
4
sockets
are the
Registry
package type
0 (off)
AT+REGISTER
Registry
1 (string)

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16
same
Packet Data
Type
Registry
Package Data
CDEBYTE-REGISTER-PACK-STR
NTP time
NTP time zone offset
480 (unit: minute) Beijing time
AT+NTPTIME
Modbus
Modbus enable
0 (Modbus off)
AT+MODBUS
Static IP
IP address
192.168.1.2
AT+IPSTATIC
subnet mask
255.255.255.0
Gateway address
192.168.1.1
Server address
192.168.1.1
Chapter 6 Tutorial
This module has many functions, and it needs to configure relevant parameters before using it, and then it can work
normally.
In the following tutorials, the operations marked with * are mandatory, and please set according to your own needs when
using other modes. Please refer to Chapter 6 for specific AT commands.
6.1 Basic TCP/UDP data transmission
Why is it called basic TCP/UDP data transmission, because this kind of data transmission is based on the transport layer
under the TCP/IP protocol, which is the most basic data transmission layer. The data at this layer is not like MQTT,
HTTP and other protocols. Complex network packets. For detailed instructions on this piece, please study by yourself.
Both the AP role and the STA role support data transmission, provided that the mandatory module and the target are
under the same LAN. There are some differences between AP mode and STA mode. For example, AP mode supports
multi-connection protocol transmission. In AP mode, there is no need to set the remote IP address in advance. This
tutorial is based on the AT command of the serial port. The operations with * in each step are necessary operations, and
the operations without * are non-essential operations that can be omitted. After opening the serial port debugging
assistant, operate.
Data transmission is further divided into: data transmission with PC and data transmission with modules.
6.1.1 Communication with PC
6.1.1.1 Communication with PC's TCP server under AP role
Here is just an example, the other two communication in TCP mode also refer to this example (TCP server, UDP), just set
different modes by AT+MODE command.
1. *Enter AT command mode
+++
2.*Set module role: AP, transmission mode: transparent transmission, service mode: TCP server;

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AT+MODE=1,1,1
3. Configure SSID related parameters (SSID is commonly known as WiFi name):
AT+SSID=0,E103-W03-TEST,2,12345678。
4. Set the port number:
AT+SVRPORTIP=4001
5. *After configuring the parameters, restart the module, find the SSID (WiFi hotspot name) set in the second step on the
PC side called E103-W03 WiFi, enter the secret connection
6. *After the connection is successful, query the local IP and local port:
AT+ SVRPORTIP?
The return is as follows: AT+SVRPORTIP=4001,192.168.1.1