Ebyte E103-W03 Specification sheet

E103-W03 Product Instruction Manual
CC3220R 2.4GHz WiFi Serial Port Module

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Content
DISCLAIMER................................................................................................................................................................................................................................4
1. OVERVIEW............................................................................................................................................................................................................................... 5
1.1 INTRODUCTION ........................................................................................................................................................................................5
1.2 FEATURES ................................................................................................................................................................................................. 5
2. SPECIFICATIONS...................................................................................................................................................................................................................6
2.1 LIMIT PARAMETERS................................................................................................................................................................................6
2.2 WORKING PARAMETERS........................................................................................................................................................................6
2.3 ELECTRICAL PARAMETERS ................................................................................................................................................................... 7
2.4 ELECTRICAL CHARACTERISTICS ......................................................................................................................................................... 8
3. MECHANICAL DIMENSIONS AND PIN DEFINITIONS ....................................................................................................................................... 8
4. RECOMMENDED WIRING DIAGRAM......................................................................................................................................................................10
5. FUNCTION DESCRIPTION ..............................................................................................................................................................................................12
5.1 ELECTRICAL CHARACTERISTICS .......................................................................................................................................................12
5.1.1Access Point (AP mode) ..............................................................................................................................................................12
5.1.2Station (STA mode) .......................................................................................................................................................................12
5.1.3 WiFi Direct (P2P mode) ............................................................................................................................................................ 12
5.2 TRANSMISSION MODE .........................................................................................................................................................................12
5.2.1 Transparent transmission .......................................................................................................................................................... 12
5.2.2 Protocol Transmission ................................................................................................................................................................13
5.3 SERVICE MODE .....................................................................................................................................................................................14
5.3.1 TCP server .....................................................................................................................................................................................14
5.3.2 TCP client ......................................................................................................................................................................................14
5.3.3 UDP ................................................................................................................................................................................................ 14
5.3.4 MQTT ............................................................................................................................................................................................. 14
5.3.5 HTTP Client ..................................................................................................................................................................................14
5.3.6 WebSocket ......................................................................................................................................................................................14
5.4 PARAMETER CONFIGURATION ............................................................................................................................................................15
5.4.1 Serial AT Configuration .............................................................................................................................................................15
5.4.2 UDP Remote Configuration ......................................................................................................................................................15
5.4.3 Browser-based web configuration ...........................................................................................................................................15
5.5 STATUS INDICATION ............................................................................................................................................................................. 15
5.6 LOW POWER CONSUMPTION .............................................................................................................................................................. 16
5.7 SERIAL PORT 3M HIGH-SPEED TRANSMISSION .............................................................................................................................. 16
5.8 HEARTBEAT PACKAGE,REGISTRATION PACKAGE .......................................................................................................................... 16
5.9 MODBUS PROTOCOL ........................................................................................................................................................................... 16
5.10 STATIC IP............................................................................................................................................................................................. 17
5.11 PIN RESTORE FACTORY PARAMETERS ............................................................................................................................................ 17
5.12 SCAN NEARBY AP INFORMATION ................................................................................................................................................... 17
5.13 DEFAULT PARAMETERS .....................................................................................................................................................................17
6. USING THE TUTORIAL ....................................................................................................................................................................................................19
6.1 BASIC TCP/UDP DATA TRANSFER ................................................................................................................................................... 19

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6.1.1 Communication with PC ............................................................................................................................................................19
6.1.2 Communication between modules ........................................................................................................................................... 26
6.2 NETWORK COMMUNICATION ............................................................................................................................................................ 30
6.2.1MQTT ...............................................................................................................................................................................................30
6.2.2HTTP Client ................................................................................................................................................................................... 32
6.2.3WebSocket .......................................................................................................................................................................................33
6.3 PARAMETER CONFIGURATION ............................................................................................................................................................34
6.3.1 Serial AT command configuration ...........................................................................................................................................34
6.3.2 UDP Remote Configuration ......................................................................................................................................................34
6.3.3 Web page configuration ............................................................................................................................................................. 35
6.4 MODBUS USAGE ................................................................................................................................................................................... 36
6.5 STATIC IP USAGE .................................................................................................................................................................................. 37
7.REVISION HISTORY........................................................................................................................................................................................................... 38
8. ABOUT US.............................................................................................................................................................................................................................. 38

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Disclaimer
EBYTE reserves all rights to this document and the information contained herein.
Products, names, logos and designs described herein may in whole or in part be
subject to intellectual property rights. Reproduction, use, modification or disclosure to
third parties of this document or any part thereof without the express permission of
EBYTE is strictly prohibited.
The information contained herein is provided “as is” and EBYTE assumes no
liability for the use of the information. No warranty, either express or implied, is given,
including but not limited, with respect to the accuracy, correctness, reliability and
fitness for a particular purpose of the information. This document may be revised by
EBYTE at any time. For most recent documents, visit www.ebyte.com.

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1. Overview
1.1 Introduction
E103-W03 is an ultra-low power serial port to Wi-Fi module, small size SMD
package, PCB antenna, working in the 2.4~2.484GHz frequency band. The module
can use the serial port to send and receive data, which reduces the threshold for
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 immediately. It supports the function of
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, it can be very convenient to realize
the network access function, and minimize 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;
Supports 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 and automatic reconnection;
Support high-speed transmission, up to serial port 3M baud rate transmission;
Support multiple power mode switching;
Support WIFI idle connection (LDPS);
Support MQTT network protocol (Alibaba Cloud, Baidu Cloud, OneNet)

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Support WebSocket connection;
Support HTTP Client
Support TCP SERVER, TCP CLIENT, UDP communication methods;
Support custom registration package, custom heartbeat package function;
Support socket distribution protocol;
AT command configuration;
Support remote command configuration;
Support Smartconfig quick network configuration;
Support transparent transmission of multiplex protocol transmission and broadcast transmission;
Support pin to restore default parameters
Support modebus protocol conversion (RTU and TCP)
Support static IPv4 address assignment
Support scanning nearby AP information
2. Specifications
2.1 Limit parameters
Main parameters
performance
Remark
Min
Max
Voltage (V)
0
3.6
Exceeding 3.6V will permanently burn the
module
blocking power（dBm）
-
10
The probability of burning at close range is
small
Operating temperature（℃）
-40
+85
Industrial grade
2.2 Working parameters
Main parameters
performance
Remark
Min
Typical
value
Max
Operating Voltage（V）
2.3
3.3
3.6
Recommended 3.3V power supply
communication level（V）
3.3
-
Operating temperature（℃）
-40
-
+85
Industrial grade design
Working frequency（Hz）
2.412
2.442G
2.472
2.4G frequency band

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G
G
Power
consump
tion
Maximum transmit power
（dBm）
17
18
18.5
Test 2.412GHz
Maximum emission
current（mA）
257
mA
260mA
268
mA
Instantaneous power consumption,DSSS
1Mbps，3.3V POWER
receive current（mA）
-
78mA
-
Average power consumption received
（2.412GHz）
sleep current（μA）
-
12uA
-
hibernate. SOP1 is left floating or pulled low
2.3 Electrical parameters
No.
Name
Value
Annotation
1
RF chip
CC3220R
TI
2
Module size
27 * 19 * 2.7mm
3
weight
2.2g
4
PCB process
4
Impedance tuning
5
Working
frequency
2.4 ~ 2.484 GHz
6
Production
Process
Lead-free process, machine
sticker
Wireless products must be machine-mounted to ensure batch
consistency and reliability
7
interface
1.27mm
SMD
8
Supply voltage
2.3 ~ 3.6V DC
Note: Voltages higher than 3.6V will cause permanent damage to
the module
9
communication
level
Max 3.6
It is recommended that the difference from the supply voltage be
less than 0.3V to reduce power consumption
10
Measured
distance
160m
Module-to-module communication, clear and open, maximum
power, height 2m, PCB antenna
180m
Module-to-module communication, 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

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Storage
temperature
-40 ~ +85℃
Industrial grade
2.4 Electrical Characteristics
Parameter
Min
Typical value
Max
Unit
Storage temperature range
-40
Normal
temperature
85
℃
Operating 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
3. Mechanical Dimensions and Pin Definitions
No.
Definition
I/O
Function and usage instructions

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1、8、9、11、
12、13、16、
17、28、29、
44
GND
power ground
2
GPIO26
IO
General IO port
3
GPIO27
IO
General IO port
4
RST
I
Module reset pin, low level reset, low level duration is greater
than or equal to 2ms.
5
SOP2
I
Burn emulation mode selection. The SOP2 pin has a built-in 2.4K
pull-down resistor; when using it, an external pull-up resistor
100R is required to pull the pin level high. Normal work is low.
6
SOP1
I
Burn emulation mode selection. The SOP1 pin has a built-in
100K pull-down resistor; when using, an external pull-up resistor
10K is required to pull the pin level high. Normal work is high.
7
SOP0
I
Burn emulation mode selection. The SOP0 pin has a built-in
100K pull-down resistor; when using it, an external pull-up
resistor of 10K is required to pull the pin level high. Normal work
is low.
10
VCC
Equipment power supply VDC: 2.4V~3.6V (above 300mA)
14
GPIO31
IO
General IO port
15
GPIO0
IO
General IO port
18
GPIO30
IO
General IO port
19
GPIO1
O
UART serial port output pin, support AT command
20
GPIO2
I
UART serial port output pin, support AT command
21
GPIO3
IO
General IO port
22
GPIO4
IO
General IO port
23
GPIO5
IO
General IO port
24
GPIO6
IO
General IO port
25
GPIO7
IO
General IO port
26
GPIO8
O
Abnormal indicator INDICATE, abnormal output is low, normal
output is high.
27
GPIO9
O
Wifi connection status indicator, connected output low,
unconnected output high
30
GPIO10
O
Network connection status indicator, connected output low,
unconnected output high
31
GPIO11
O
Smartconfig status indicator, low when entering the state, high
when not entering the state
32
GPIO12
I
Factory reset pin, active low. Stay low for 3 seconds or more at
power-up. No need to reboot again.
33
GPIO13
I
WAKEUP wakeup pin
34
GPIO14
IO
General IO port
35
GPIO15
IO
General IO port
36
GPIO16
IO
General IO port

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37
GPIO17
IO
General IO port
38
GPIO22
IO
General IO port
39
GPIO28
IO
General 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
4. Recommended Wiring Diagram
Notice:
1. The power supply must be guaranteed to be 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 higher 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 is connected to the MCU_TXD/MCU_RXD of the external MCU respectively.
3. When powering on, the SOP1 pin needs to be connected to a 10K 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, so it will not be

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dealt with here). Otherwise it will not work properly.
4. If secondary development is required, the connection method 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 select the
mode by yourself.
5. If there are high requirements 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.

5. Function Description
The working mode of this module is divided into three levels: working role; transmission mode; service category.
From the role of the WiFi layer, it can be divided into Access Point, commonly known as AP access point, Station,
commonly known as station, and WiFI-Direct, also known as 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 Electrical Characteristics
Job roles are defined from the perspective of the WiFi physical layer.
5.1.1Access Point (AP mode)
Access Point is referred to as AP mode, which is similar to a router, allowing wireless devices to connect and
establish TCP/IP-based server, client, and UDP communications. In this mode, 4 stations can be connected, and a
maximum of 4 Tcp socket transmissions are supported. Command AT+MODE=1,x,x set the first bit as: 1, to configure
the module to work in the AP role.
5.1.2Station (STA mode)
Station mode is referred to as STA. In this role, the module does not provide connection, but can only be connected
to an Access Point or a router. This module supports TCP server, TCP client, and UDP in the Station role, and supports a
maximum of 4 sockets. Also supports MQTT, WebSocket, HTTP clinet. The command AT+MODE=2,x,x sets the first bit
as: 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 known as P2P,
which is similar to Bluetooth but the transmission rate is significantly higher than that of Bluetooth. Command
AT+MODE=3,x,x to set the first bit as: 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 channels, we define it as protocol transmission. It should be noted that the transmission mode parameter does
not take effect on 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

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network is sent directly without any format. Command 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 supporting multiple sockets, in order to distinguish the source and destination of data, we define it as a
protocol transmission, which includes specified sending and broadcast sending.
5.2.2.1 Specify Send
Specifying to send means that the data packet input to the serial port contains a unique socketed ID label, 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, represents the discovery of Socket 0 link
0x01, represents the discovery of Socket 1 link
0x02, represents the discovery of Socket 2 link
0x03, represents the discovery of the 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 serial
port
5.2.2.2 Broadcast transmission
When the Socket ID is 0xff, it means broadcasting. If a 4-way connection is established, the data will be sent to the
4-way socket at the same time, otherwise, the data will be sent to the established connection.
5.2.2.3 Protocol reception
fixed head
Socket ID
length
Data
3 Byte
1Byte
2Byte
N Byte
fixed head：
0xAA 0xFE 0x55
Socket ID：
0x00, represents the discovery of Socket 0 link
0x01, represents the discovery of Socket 1 link
0x02, represents the discovery of Socket 2 link
0x03, represents the discovery of the Socket 3 link
length:
The actual length of the application data, 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, the content is: 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.

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5.3 Service Mode
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) that are often referred to. Here, UDP, MQTT, HTTP client,
WebSocket, etc. are all included. into this mode. Note that the service mode has no effect on the WiFi-Direct (P2P) role.
The service mode includes the following.
5.3.1 TCP server
Make 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
Make 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.
5.3.4 MQTT
The module supports Alibaba Cloud, Baidu Cloud, OneNet and other IoT platforms in MQTT mode. Enter the service
parameters created on the platform into the module to communicate.
5.3.4.1 Alibaba Cloud
For network communication based on Alibaba Cloud platform, you need to log in to Alibaba Cloud to obtain relevant
parameters, including product secret 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 and other confidence. For details, please refer to
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, 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 identifier URL, and start a
trigger request to get the resources responded by the server. You don't need to care about the complex 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

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cannot be used for applications where the web client and the web server frequently interact. The application of the
WebSocket function allows the E103-W03 module to pass the serial port. Real-time interaction with the web page 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 web page. For details, see Chapter 7 WebSocket Configuration
Tutorial
5.4 Parameter configuration
There are 3 ways to configure parameters: serial port-based AT command configuration, UDP-based remote AT
configuration, and browser-based web page configuration. For detailed operation, see Chapter 6 AT Command
Description and Chapter 7 Tutorial.
5.4.1 Serial AT Configuration
When you need to use serial AT commands to configure parameters, first send "+++" to enter the AT mode, and then
operate according to the AT commands 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 AT command chapter. prevail.
To exit AT mode, send the command: AT+EXIT. Anytime sending "+++" command 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 the parameter configuration performed under the same network using network debugging
tools, which can also be called over-the-air configuration. There are two ways to enter into the 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, the parameters can be configured by setting the corresponding IP and port. The
remote configuration must be in AP mode or STA mode and can only be performed after a network connection has been
established. This function is not supported in P2P mode.
5.4.3 Browser-based web configuration
The web configuration must ensure that the PC and the module are in the same local area network. There are two ways to
enter the web configuration: the module is in AP mode, and the PC is connected to the module; 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 a
browser, and accesses a 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 instruction: print "Entered AT mode" when entering the AT command, print "Exited AT mode" when exiting
the AT command, print "ERR=x" when the AT command is wrong, and return the set value if the AT command is correct.
The pin indication includes WiFi connection status indication, socket connection status indication and module abnormal
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.

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The INDICATE pin remains low when the module is working normally. If the module has an abnormal INDICATE pin
outputting a high level, the module needs to be restarted at this time.
5.6 Low power consumption
The low power consumption of the module enables the module to enter the sleep state through command operation. After
entering the sleep state, it can be woken up through the pin. The wake-up method is to give a rising edge to the WAKEUP
pin (ie GPIO_13), or the serial port receives data.
5.7 Serial port 3M high-speed transmission
Regarding high-speed transmission, the following issues need to be paid attention to:
1. The serial port chip must be a model that can support 3M baud rate. The company's test baseboard uses FT232 series
2. The serial port assistant software must be able to support 3M baud rate. The company's testing software is XCOM2.6
3. The connection between the module and the PC should not go 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 is connected to a computer or mobile phone, which can realize 3M transmission rate. However, when the
module is connected to the module, it may be necessary to reduce the baud rate of the transmitting end. The specific
amount to be reduced is limited by the influence of the connection distance and requires actual testing.
5.8 Heartbeat package, registration package
Heartbeat package registration package is a function only in TCP client mode. This module supports custom heartbeat
package data and registration package data content.
5.9 Modbus Protocol
This module supports Modbus protocol and can realize free conversion between RTU and TCP. When in use, you only
need to pass in the data from the serial port, the module will automatically identify and convert it into data that conforms
to the Modbus specification and upload it to the network. Or convert the received data on the network side into data that
conforms to the Modbus specification and output from the serial port.
requires attention:
1. The Modbus supported by this module is only for data conversion and does not support actual functional operations. If
you need to use this part of the function, please cooperate with the actual PLC equipment.
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, but the
HTTP client does not. The reason is that because the HTTP client is a short-connection communication method, 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 to realize the communication of 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
address cannot be assigned and it will not work properly. For example, 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, and corresponding AT commands are
not supported in other modes.
5.11 Pin restore factory parameters
This module will only actively detect the level state of the GPIO12 pin within 3 seconds when it is powered on. If it is
low, it will restore the parameters to the factory default parameters. There is no need to restart during use, and the
GPIO12 pin will be set to low level after the parameters are restored successfully.
5.12 Scan nearby AP information
When the module works in STA mode, you can use AT commands to scan the AP information nearby, if there is, the AP
information will be printed out through the serial port, the format is as follows:
fixed head
SSID
MAC(BSSID)
channel
rssi
+scan:
up to 32 bytes
17Bytes
up to 3 bytes
up to 3 bytes
+scan:
TEST_ZW
14:AD:CA:AA:91:D6
4
-69
1. Scanning for nearby APs can only take effect in STA mode, the connection mode is manual connection, and the wifi
connection has not been 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 terminated by a carriage return and line feed (\r\n). The MAC
addresses (BSSID) are separated by semicolon ':'
3. The module can only scan 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 in a single 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 port 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
work 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 local IP
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（close）
AT+HEARTBT
heartbeat
timeout
5（Unit: second）
Heartbeat data
type
1（string）
Heartbeat data
CDEBYTE-E103-W03-STRHT
Registration
package
parameters
4
sockets
are the
Registration
package type
0（close）
AT+REGISTER
Registration
1（string）

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same
package data
type
Registration
package data
CDEBYTE-REGISTER-PACK-STR
NTP time
NTP timezone offset
480 (unit: minutes) Beijing time
AT+NTPTIME
Modbus
Modbus enabled
0（colse Modbus）
AT+MODBUS
static IP
IP address
192.168.1.2
AT+IPSTATIC
subnet mask
255.255.255.0
gateway address
192.168.1.1
gateway address
192.168.1.1
6. Using the Tutorial
This module has many functions, you need to configure relevant parameters before using it, and then it can work
normally.
In the following tutorials, the operations added with * are the operations that must be performed. Please set them
according to your own needs when using other modes. Please refer to Chapter 6 for the specific AT command description.
6.1 Basic TCP/UDP data transfer
Why is it called basic TCP/UDP data transmission, because this 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 carried out by protocols
such as MQTT and HTTP. complex network packets. Please study on your own for detailed instructions on this piece.
Both the AP role and the STA role support data transmission, provided that the required selection ensures that the module
and the target are in the same local area network. There are only some differences between AP mode and STA mode. For
example, AP mode supports multi-connection protocol transmission. In AP mode, it is not necessary 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 those without * are unnecessary 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 the PC's TCP server in the AP role
This is just an example. The other two communications in TCP mode also refer to this example (TCP server, UDP), and
you can set different modes through the AT+MODE command.
1. *Enter AT command mode
+++
2. *Set the module role: AP, transmission mode: transparent transmission, service mode: TCP server;
AT+MODE=1,1,1
3. Configure SSID related parameters (SSID is commonly known as WiFi name):

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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 WiFi with the SSID (WiFi hotspot name) set in the
second step called E103-W03 on the PC side, and 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
7.*Open the TCP debugging assistant, because the module is a server, so create a client here, and enter the corresponding
IP and port information in step 7, as shown in the figure: