v2.1.0.0-rc1_esp32

ESP32-AT Release v2.1.0.0-rc1

Documentation for Release v2.1.0.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v2.1.0.0_esp32/

ESP32-AT v2.1.0.0-rc1 is a major update for ESP32-AT v2.0.0.0.

This is the list of changes since ESP32-AT releases v2.0.0.0.

SDK Update and Known issue

• It may wakeup fail from light sleep.

1.Feature

• ESP-IDF version update to release v4.0(e7ac221b).

1.1 Wi-Fi

• AT+CWCOUNTRY: configurate and query the WiFi country code.
• AT+CWSTAPROTO: set and query the 802.11 b/g/n protocol standard of station mode.
• AT+CWAPPROTO: set and query the 802.11 b/g/n protocol standard of SoftAP mode
• Support automatically connect to the previous AP when station mode is enabled again by AT+CWMODE.
• Support scan mode configuration in the command AT+CWJAP.

1.2 TCP/IP

• AT+CIPTCPOPT: configurate and query the TCP socket options, include SO_LINGER, TCP_NODELAY, SO_SNDTIMEO options.
• Support multicast address in the command AT+CIPSTART.

1.3 TLS

• AT+CIPSSLCCN: configurate and query SSL client common name(CN).
• AT+CIPSSLCSNI: configurate and query SSL client server name indication(SNI).
• AT+CIPSSLCALPN: configurate and query SSL client application layer protocol negotiation(ALPN).
• AT+CIPSSLCPSK: configurate and query SSL client pre-shared key(PSK).

1.4 BT & BLE

• Enable BLE HID commands by default.
• AT+BTCOD: Configure class of BT device.
• AT+BLUFI: start and stop BLUFI function(configure Wi-Fi information by BLE).
• AT+BLEADVDATAEX: set BLE advertising data automatically.
• Add query command of AT+BTSCANMODE, to query BT scan mode.
• Support multiple services in AT+BLEGATTSSRVCRE.
• Support scan filter in command AT+BLESCAN.
• Support discoverable but not connectable mode in command AT+BTSCANMODE.
• Support BT Pair Compare key.
• Support retransmission for BT SPP.
• Support store some BT and BLE parameters to flash.
• Support BLE connection callback for user to customize it.

1.5 MQTT

• Enable MQTT commands by default.
• AT+MQTTCLIENTID: set and query MQTT client ID
• AT+MQTTUSERNMAE: set and query MQTT username
• AT+MQTTPASSWORD: set and query MQTT password
• Add query command for AT+MQTTUSERCFG.
• Add query command for AT+MQTTCONNCFG.
• Add query command for AT+MQTTUSERNAME.
• Add query command for AT+MQTTCLIENDID.
• Add query command for AT+MQTTPASSWORD.
• Add MQTT authentication method configuration in menuconfig.

1.6 HTTP

• Enable HTTP commands by default.
• AT+HTTPGETSIZE: get HTTP resource size.
• Support custom request headers in the command AT+HTTPCLIENT.

1.7 System

• AT+SLEEPWKCFG: configurate the light-sleep wakeup source and awake GPIO.
• AT+SYSSTORE: to set whether store parameters into flash or not.
• Separate WPS, PING, SmartConfig and MDNS commands in menuconfig.
• Support cmake to compile esp-at project.
• Use ESP-TLS instead of openSSL when OTA via SSL.
• Add UART port configuration in the factory parameter binary.
• Change factory parameter version to v2.

1.8 Example

• Add STM32 example for SDIO SPI AT.
• Add STM32 SDIO host example.

2. Bugfix

2.1 Wi-Fi

• Fix AT+RFPOWER set fail when Wi-Fi commands are disabled.
• Fix AT+CWLAP scan fail while it is connecting Wi-Fi.
• Fix incorrect Wi-Fi state when AT+CWJAP failed.
• Fix the range of AT+CIPRECONNINTV to be [1, 36000].
• Add missing Wi-Fi status information if AT+CIPMODE=1.

2.3 UART

• Fix UART parity configuration error.

2.4 BT & BLE

• Fix crash issue when the BLE notification value is too long.
• Fix crash issue when re-create BLE services.
• Fix re-enter BLE SPP fail.
• Fix AT+BLESCAN incorrect parameter issue.
• Fix HID init fail.
• Fix data lost issue in BLE SPP.
• Fix exit from bluetooth throughput mode failed
• Optimize BLE service discovery in multiple connections status.

2.5 MQTT

• Fix MQTT crash issue.
• Fix a block issue of AT+MQTTPUB
• Fix MQTT can not automatically reconnect.
• Fix incorrect topic length if the received MQTT data is too long.
• Fix AT+MQTTPUB fail when Wi-Fi is reconnected.
• Fix the limited data length of AT+MQTTPUBRAW.
• Fix the incorrect state responded by AT+MQTTCONN? when Wi-Fi is reconnected.
• Fix AT+MQTTCONN fail when MQTT closes and re-builds the link.

2.6 HTTP

• Fix print error of HTTP-download data.
• Add check of http transport type in the command AT+HTTPCLIENT.
• Fix a crash issue of some special URL in the command AT+HTTPCLIENT.

2.7 System

• Fix probable busy issue after AT+CIPSEND returns OK.
• Fix incorrect information in the factory_parameter.log if module name is not defined.
• Fix an AT command response error.
• Fix incorrect AT+CIPSTATUS state when Wi-Fi disconnected.
• Add missing "+QUIT" message when quit transmission mode and AT+SYSMSG=1

2.8 DNS

• Fix an issue of incorrect last DNS configuration in command AT+CIPDNS.

2.9 PING

• Fix an error of AT+PING

Optimizations

• Optimize sockets process workflow.
• Optimize AT+CIPSTATUS command process.
• Optimize transmit terminal process.
• Check the default max TX power's validity.

v2.0.0.0_esp32

ESP32_AT_V2.0.0.0 Release Note

Documentation:
esp32_at_instruction_set_and_examples_en.pdf or
esp32_at_instruction_set_and_examples_cn.pdf.

Feature

• Update ESP-IDF to version 3.3(6ccb4cf5).

Base command

• AT+SYSROLLBACK: Roll back to the previous firmware.
• AT+SYSTIMESTAMP: Set local time stamp.

Wi-Fi command

• AT+CWHOSTNAME: Configures the host name of ESP station
• AT+CWQIF: Disconnect station from the ESP softAP.
• Update command AT+CWJAP, add a parameter of listen interval

TCPIP command

• AT+CIPSTARTEX: Establishes TCP connection, UDP transmission or SSL connection by auto assigning ID.
• AT+CIPSSLCCONF: Config SSL client.
• AT+CIPRECONNINTV: Set the interval of auto-reconnecting in Wi-Fi UART passthrough mode.
• AT+CIPRECVMODE: Set socket receive Mode.
• AT+CIPRECVDATA: Get socket data in passive receive mode.
• AT+CIPRECVLEN: Get socket data length in passive receive mode.
• AT+PING: Ping packets
• AT+CIPDNS: Configures Domain Name System. The configuration will be saved in flash
• Update command AT+CIUPDATE, support SSL OTA and version parameter

BLE command

• AT+BLESETKEY: Set BLE static pair key
• AT+BLEHIDINIT: BLE HID device profile initialization
• AT+BLEHIDKB: Send BLE HID Keyboard information
• AT+BLEHIDMUS: Send BLE HID mouse information
• AT+BLEHIDCONSUMER: Send BLE HID consumer information

Classic Bluetooth command

• AT+BTINIT : Classic Bluetooth initialization
• AT+BTNAME : Sets BT device's name
• AT+BTSCANMODE : Sets BT SCAN mode
• AT+BTSTARTDISC : Start BT discovery
• AT+BTSPPINIT : Classic Bluetooth SPP profile initialization
• AT+BTSPPCONN : Establishes SPP connection
• AT+BTSPPDISCONN : Ends SPP connection
• AT+BTSPPSTART : Start Classic Bluetooth SPP profile
• AT+BTSPPSEND : Sends data to remote bt spp device
• AT+BTA2DPINIT : Classic Bluetooth A2DP profile initialization
• AT+BTA2DPCONN : Establishes A2DP connection
• AT+BTA2DPDISCONN : Ends A2DP connection
• AT+BTA2DPSRC : Set or query the audio file URL
• AT+BTA2DPCTRL : control the audio play
• AT+BTSECPARAM :Set and query the Classic Bluetooth security parameters
• AT+BTKEYREPLY :Input the Simple Pair Key
• AT+BTPINREPLY :Input the Legacy Pair PIN Code
• AT+BTSECCFM: Reply the confirm value to the peer device in the legacy connection stage
• AT+BTENCDEV : Query BT encryption device list
• AT+BTENCCLEAR : Clear BT encryption device list

MQTT command

• AT+MQTTUSERCFG : Set MQTT User Config
• AT+MQTTCONNCFG : Set configuration of MQTT Connection
• AT+MQTTCONN : Connect to MQTT Broker
• AT+MQTTPUB : Publish MQTT Data in string
• AT+MQTTPUBRAW : Publish MQTT message in binary
• AT+MQTTSUB : Subscribe to MQTT Topic
• AT+MQTTUNSUB : Unsubscribe from MQTT Topic
• AT+MQTTCLEAN : Close the MQTT Connection

HTTP command

• AT+HTTPCLIENT - Send HTTP Client Request

Bugfix

• fix: It may crash if AT command ends without '\r\n'
• fix: Sometimes it may fail to quit from UART-WiFi passthrough mode
• fix: AT+CIPSTART does not work if just enable ethernet

Optimizations

• Add "\r\n" to the end of the +IPD for that MCU distinguishes the new command easily

v2.0.0.0_esp8266

ESP8266_AT_V2.0.0.0 Release Note

This is the first release of ESP8266 RTOS AT firmware, which supports AT commands through UART. Here is a list of AT commands. More details please refer to README.md

Basic AT Commands List.

• AT : Tests AT startup.
• AT+RST : Restarts a module.
• AT+GMR : Checks version information.
• AT+GSLP : Enters Deep-sleep mode.
• ATE : Configures echoing of AT commands.
• AT+RESTORE : Restores the factory default settings of the module.
• AT+UART_CUR : Current UART configuration.
• AT+UART_DEF : Default UART configuration, saved in flash.
• AT+SLEEP : Sets the sleep mode.
• AT+SYSRAM : Checks the remaining space of RAM.
• AT+SYSMSG : Set message format.
• AT+RFPOWER : Set RF TX Power.

Wi-Fi AT Commands List

• AT+CWMODE : Sets the Wi-Fi mode (STA/AP/STA+AP).
• AT+CWJAP : Connects to an AP.
• AT+CWLAPOPT : Sets the configuration of command AT+CWLAP.
• AT+CWLAP : Lists available APs.
• AT+CWQAP : Disconnects from the AP.
• AT+CWSAP : Sets the configuration of the ESP32 SoftAP.
• AT+CWLIF : Gets the Station IP to which the ESP32 SoftAP is connected.
• AT+CWDHCP : Enables/disables DHCP.
• AT+CWDHCPS : Sets the IP range of the ESP32 SoftAP DHCP server. Saves the setting in flash.
• AT+CWAUTOCONN : Connects to the AP automatically on power-up.
• AT+CIPSTAMAC : Sets the MAC address of ESP32 Station.
• AT+CIPAPMAC : Sets the MAC address of ESP32 SoftAP.
• AT+CIPSTA : Sets the IP address of ESP32 Station.
• AT+CIPAP : Sets the IP address of ESP32 SoftAP.
• AT+CWSTARTSMART : Starts SmartConfig.
• AT+CWSTOPSMART : Stops SmartConfig.
• AT+WPS : Enables the WPS function.
• AT+MDNS : Configurates the MDNS function

TCP/IP-Related AT Commands List

• AT+CIPSTATUS : Gets the connection status.
• AT+CIPDOMAIN : DNS function.
• AT+CIPSTART : Establishes TCP connection, UDP transmission or SSL connection.
• AT+CIPSEND : Sends data.
• AT+CIPSENDEX : Sends data when length of data is , or when \0 appears in the data.
• AT+CIPCLOSE : Closes TCP/UDP/SSL connection.
• AT+CIFSR : Gets the local IP address.
• AT+CIPMUX : Configures the multiple connections mode.
• AT+CIPSERVER : Deletes/Creates TCP or SSL server.
• AT+CIPSERVERMAXCONN : Set the Maximum Connections Allowed by Server.
• AT+CIPMODE : Configures the transmission mode.
• AT+SAVETRANSLINK : Saves the transparent transmission link in flash.
• AT+CIPSTO : Sets timeout when ESP32 runs as a TCP server.
• AT+CIPSNTPCFG : Configures the time domain and SNTP server.
• AT+CIPSNTPTIME : Queries the SNTP time.
• AT+CIUPDATE : Updates the software through Wi-Fi.
• AT+CIPDINFO : Shows remote IP and remote port with +IPD.

v1.2.0.0

ESP32 AT V1.2.0.0 Release Note

Documentation

• ESP32 AT Instruction Set and Examples
• ESP32 AT 指令集与使⽤示例

Features

• Update version number to ESP-IDF v3.2.0
• Solve an issue that an ESP device working in SoftAP may reboot unexpectedly under certain special environment.
• Support multiple BLE connections, with a maximum connection number of 3.

Bug fixes

• Fix a bug that an SSL connection is sometimes established even when the CA certificate is incorrect.
• Fix a bug that the auto connecting sometimes fails in the UART-WiFi throughput mode.
• Fix a bug that the URC message that indicates Wi-Fi is disconnected may get lost, when the Wi-Fi router is turned off unexpectedly.
• Fix a bug that the BLE sometimes fails to write Characteristic values, when this remote Characteristic supports multiple properties.
• Fix a bug that the BLE connection parameters sometimes are still inquired even when the BLE connection is ended already.
• Fix a bug that is related to setting the BLE scan parameters.
• Fix a bug that the command of establishing a BLE connection may get stuck.
• Revise the document for the description of the BLE security parameter.

v1.1.3.0

ESP32 AT V1.1.3.0 Release Note

Documentation:
esp32_at_instruction_set_and_examples_en.pdf or
esp32_at_instruction_set_and_examples_cn.pdf.

Features

• Update ESP-IDF to version 3.0.7, and solve the reboot issue of an ESP device when it's in softAP mode under certain special environment.
• Add factory parameter partition to adapt the AT firmware to different modules without recompilation.

Bug fixes

• Fix the bug of the possible system crash when TCP server is closed.

v1.1.2.0

ESP32 AT V1.1.2.0 Release Note

Documentation:
esp32_at_instruction_set_and_examples_en.pdf or
esp32_at_instruction_set_and_examples_cn.pdf.

Features

• Update ESP-IDF to version 3.0.3(054e82b4).

Bug fixes

• Fix an issue that system will crash if BLE scans too many devices.
• Fix an issue that system will crash if ‘\r\n’ is missed in AT command as an end mark.

v1.1.1.0

ESP32 AT V1.1.1.0 Release Note

Documentation:
esp32_at_instruction_set_and_examples_en.pdf or
esp32_at_instruction_set_and_examples_cn.pdf.

WiFi AT

Bug fixes

• Fix bug that ESP32-AT get crushed when been sent AT with 2 "\r\n"

v1.1.0.0

ESP32 AT V1.1.0.0 Release Note

Documentation:
esp32_at_instruction_set_and_examples_en.pdf or
esp32_at_instruction_set_and_examples_cn.pdf.

BLE AT

Features

AT+BLESPPCFG : Sets BLE spp parameters
AT+BLESPP : Enter BLE spp mode
AT+BLESECPARAM : Set BLE encryption parameters
AT+BLEENC : Initiate BLE encryption request
AT+BLEENCRSP : Grant security request access.
AT+BLEKEYREPLY : Reply the key value to the peer device in the lagecy connection stage.
AT+BLECONFREPLY : Reply the comfirm value to the peer device in the lagecy connection stage.
AT+BLEENCDEV : Query BLE encryption device list
AT+BLEENCCLEAR : Clear BLE encryption device list

Bug fixes

• Fix bug that gatt client exception after disconnect
• Fix gatt Server did not get correct write result code
• Fix gatt cmd will not report error when disconnected
• Fix ble incorrect optional parameter checking
• Fix ble incorrect param type checking
• Fix ble read/write to char/descriptor without permission did not return error
• Fix ble Set ATTR value fail
• Fix ble 128bit uuid crash
• Fix bug that when deinit the ble, do not free gatts list
• Fix ble autoconnect in passthrough mode

Optimizations

• support char write long and add param for multi connection
• support gatts initiate disconnect from client
• support multi conn for server
• update connection param command support gatt server

WiFi AT

Features

AT+RFPOWER : Set RF TX Power
AT+CIPSSLCCONF : Config SSL client

Bug fixes

• Fix bug that UDP packet loss is serious when transparent transmission
• Fix bug that print error log when startup
• Fix bug restart problem after boot-strap
• Fix bug that reconnect to TCP server twice in passthrough mode
• Fix bug the throughput is very low when uart baudrate is 2000000
• Fix bug that ssl connection doesn't reconnect to server when disconnected
• Fix bug the current is about 77uA after deep sleep
• Fix ping repeatedly cause reboot
• Fix bug It crashes when UART baudrate and mcu mismatch
• Fix bug tcp server will be closed when connections reach max
• Fix bug that crash if the parameter number of AT command is less than esp_at_get_para_as_digit parameter number
• Fix bug that it doesnot work when configure server max connection
• Fix bug that it print CLOSED after link disconnect when in transparent transmition
• Fix bug that remote port is incorrect.
• Fix bug the type of execution command parses error
• Fix Bug that it will reboot after restarting if setting AT+SAVETRANSLINK
• Fix Bug that works bad if delayed among each character when sending command
• Fix bug it crash when smartconfig,if SSID length is 32
• Fix connected UDP display wrong IP
• Fix bug that SSL server accepts fail
• Fix bug that Print 'CONNECT' when ssl connect fail
• Set the range of AT+CWLAPOPT
• Fix bug that Print wifi status when wifi status change
• Fix bug that Sometimes AT+CIPCLOSE cannot return
• Fix bug that TCP doesn't disconnect when WiFi station disconnected
• Fix bug that the static param conning_flag was not reset after deinit
• Fix bug that WiFi reconnect after AT+CWQAP
• Fix Delay time is incorrect
• Fix Dns servers change when connecting different AP

Optimizations

• Set Default uart is flow control,and add uart query cmd
• Add AT command line terminator
• Add esp_at_custom_net_ops_regist in esp_at.h to callback some status about socket
• add query cmd for blescanparam
• Add multi-ca support for ssl client
• Add save SSID when using WPS
• Add prefix in the string by AT+CWLIF responsed
• Optimize ssl memory in AT module

v1.0.0.0

ESP32 AT V1.0 Release Note

Documentation:
esp32_at_instruction_set_and_examples_en.pdf or
esp32_at_instruction_set_and_examples_cn.pdf.

BLE AT

• AT+BLEINIT : Bluetooth Low Energy (BLE) initialization
• AT+BLEADDR : Sets BLE device's address
• AT+BLENAME : Sets BLE device's name
• AT+BLESCANPARAM : Sets parameters of BLE scanning
• AT+BLESCAN : Enables BLE scanning
• AT+BLESCANRSPDATA : Sets BLE scan response
• AT+BLEADVPARAM : Sets parameters of BLE advertising
• AT+BLEADVDATA : Sets BLE advertising data
• AT+BLEADVSTART : Starts BLE advertising
• AT+BLEADVSTOP : Stops BLE advertising
• AT+BLECONN : Establishes BLE connection
• AT+BLEDISCONN : Ends BLE connection
• AT+BLEDATALEN : Sets BLE data length
• AT+BLECFGMTU : Sets BLE MTU length
• AT+BLEGATTSSRVCRE : Generic Attributes Server (GATTS) creates services
• AT+BLEGATTSSRVSTART : GATTS starts services
• AT+BLEGATTSSRV : GATTS discovers services
• AT+BLEGATTSCHAR : GATTS discovers characteristics
• AT+BLEGATTSNTFY : GATTS notifies of characteristics
• AT+BLEGATTSIND : GATTS indicates characteristics
• AT+BLEGATTSSETATTR : GATTS sets attributes
• AT+BLEGATTCPRIMSRV : Generic Attributes Client (GATTC) discovers primary services
• AT+BLEGATTCINCLSRV : GATTC discovers included services
• AT+BLEGATTCCHAR : GATTC discovers characteristics
• AT+BLEGATTCRD : GATTC reads characteristics
• AT+BLEGATTCWR : GATTC writes characteristics

System AT

Bug fixes

• Fix a bug that error log is printed when startup
• Fix restart problem after boot-strap
• Fix crash after use hardware AES driver

Optimizations

• AT+FS : fatfs is supported
• Add custom partitions table
• Rename at customize area and add command to operate partition
• Set frequency 80Mhz to reduce power consumption
• Add ESP32 AT custom partitions table
• Add firmware version in AT+GMR
• Change the configuration of UART flow control
• Enable ble in sdkconfig.defaults
• partition: Adjust partition table for ble
• Set xtal freq to be 40Mhz by default

WiFi AT

Bug fixes

• Fix a bug that fail to send UDP packet in some cases
• Fix wrong IP format
• Fix error server timeout
• Fix AT+CWQAP shows OK in ap mode
• Fix a bug that system may crash if the SSID length is 32 in smartconfig
• Fix a bug that server timeout does not work for SSL connection in some scenarios
• Fix a bug that "+IPD" is apart from data
• Fix a bug that sometimes AT+CIPCLOSE cannot return

Optimizations

• AT+CWSTARTSMART : Airkiss + ESP-TOUCH
• AT+PING : ping function
• AT+MDNS : mdns function
• AT+CIPSERVERMAXCONN : set the max connections allowed by server
• Add AT+CWMODE=0 to stop WiFi
• Add prefix in the string by AT+CWLIF responsed
• Modify the information of query server
• Support more ssl protocal version
• SSL client supports transparent transmission
• Support ssl server and add AT+CIPSERVER? command
• Optimize AT+CIUPDATE to support ssl update
• Add parameter for AT+CIUPDATE to specify ota version
• Configure six sockets by default
• Modify README of tools for AT, and provide ssl cert bin for testing
• Optimize UART-WiFi passthrough mode for autoconnection and UDP transmission
• Optimize smartconfig to save SSID and password into flash
• Optimize SSL connection.

Tools

• Add tool for PKI bin
• Add GATT service bin generation tool

v0.10.0.0

ESP32_AT_V0.10.0.0 Release Note

This is the first release of ESP32 AT firmware, which supports AT commands through UART.

Here is a list of AT commands. More details are in documentation esp32_at_instruction_set_and_examples_en.pdf or
esp32_at_instruction_set_and_examples_cn.pdf.

Basic AT Commands

• AT : Tests AT startup.
• AT+RST : Restarts a module.
• AT+GMR : Checks version information.
• AT+GSLP : Enters Deep-sleep mode.
• ATE : Configures echoing of AT commands.
• AT+RESTORE : Restores the factory default settings of the module.
• AT+UART : UART configuration.
• AT+UART_CUR : Current UART configuration.
• AT+UART_DEF : Default UART configuration, saved in flash.
• AT+SLEEP : Sets the sleep mode.
• AT+SYSRAM : Checks the remaining space of RAM.

Wi-Fi AT Commands

• AT+CWMODE : Sets the Wi-Fi mode (STA/AP/STA+AP).
• AT+CWJAP : Connects to an AP.
• AT+CWLAPOPT : Sets the configuration of command AT+CWLAP.
• AT+CWLAP : Lists available APs.
• AT+CWQAP : Disconnects from the AP.
• AT+CWSAP : Sets the configuration of the ESP32 SoftAP.
• AT+CWLIF : Gets the Station IP to which the ESP32 SoftAP is connected.
• AT+CWDHCP : Enables/disables DHCP.
• AT+CWDHCPS : Sets the IP range of the ESP32 SoftAP DHCP server. Saves the setting in flash.
• AT+CWAUTOCONN : Connects to the AP automatically on power-up.
• AT+CIPSTAMAC : Sets the MAC address of ESP32 Station.
• AT+CIPAPMAC : Sets the MAC address of ESP32 SoftAP.
• AT+CIPSTA : Sets the IP address of ESP32 Station.
• AT+CIPAP : Sets the IP address of ESP32 SoftAP.
• AT+CWSTARTSMART : Starts SmartConfig.
• AT+CWSTOPSMART : Stops SmartConfig.
• AT+WPS : Enables the WPS function.

TCP/IP-Related AT Commands

• AT+CIPSTATUS : Gets the connection status.
• AT+CIPDOMAIN : DNS function.
• AT+CIPSTART : Establishes TCP connection, UDP transmission or SSL connection.
• AT+CIPSEND : Sends data.
• AT+CIPSENDEX : Sends data when length of data is , or when \0 appears in the data.
• AT+CIPCLOSE : Closes TCP/UDP/SSL connection.
• AT+CIFSR : Gets the local IP address.
• AT+CIPMUX : Configures the multiple connections mode.
• AT+CIPSERVER : Deletes/Creates TCP server.
• AT+CIPMODE : Configures the transmission mode.
• AT+SAVETRANSLINK : Saves the transparent transmission link in flash.
• AT+CIPSTO : Sets timeout when ESP32 runs as a TCP server.
• AT+CIUPDATE : Updates the software through Wi-Fi.
• AT+CIPDINFO : Shows remote IP and remote port with +IPD.
• AT+CIPSNTPCFG : Configures the time domain and SNTP server.
• AT+CIPSNTPTIME : Queries the SNTP time.