ESP8266-AT Release v2.2.0.0

Documentation for v2.2.0.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v2.2.0.0_esp8266/
You can download the firmwares to use them, which support OTA from espressif‘s server.

ESP8266-IDF-AT_V2.2.0.0.zip

ESP8266-AT v2.2.0.0 is a major update for ESP8266-AT v2.1.0.0.

Changelog

This is the list of changes since release v2.1.0.0:

Breaking Changes

• ESP8266_RTOS_SDK version updated to release v3.4 (967752e)
• Compiler upgraded from v5.2.0 to v8.4.0
• AT+CIPDOMAIN: Double quotation marks are added to the string parameters in the response
• Added WROOM-02-N, WROOM-S2, WROOM_5V2L, ESP8266_1MB module support
• AT commands supports IPv6 network now
• ESP8266 SPI AT does not support any more (ESP32-C3 recommended)
• AT+CWJAP command cannot connect to the open AP any more when given non-null password parameter

Known Issue

• AT+CWJAP: listen_interval parameter is wrong in the query command response

1. Feature

1.1 Wi-Fi

• AT+CWRECONNCFG: Support to configure Wi-Fi reconnect interval and maximum retry times
• AT+CWLAPOPT: Support to filter the scanned result by rssi and authmode
• AT+CWJAP: Limit the range of listen interval to [1, 100]
• AT+WPS: Support authmode floor configuration
• AT+CWSMARTSTART: Support authmode floor configuration
• AT+CWLAP: Support the information of 802.11 b/g/n in the response
• AT+CWJAP: Support to configure timeout and pmf, and connect the last recorded AP
• AT+CWSTATE: New Command to query Wi-Fi state

1.2 TCP/IP

• AT+SYSMSG: Extended BIT2 parameter for passthrough mode

• AT+CIUPDATE: Support to upgrade custom partitions and asynchronous OTA

• AT+PING: Added an error message TIMEOUT for incorrect DNS

• Modified tcp mss and wnd to improve compatibility

  • Modified tcp mss, from 1460 to 1440
  • Modified tcp wnd, from 5840 to 5760
  • Modified tcp snd buf, from 2920 to 2880

• Replaced wolfSSL with mbedTLS in SSL connection

• Disabled setting AT+CIPSSLCCN, AT+CIPSSLCSNI, AT+CIPSSLCALPN, AT+CIPSSLCPSK if the link is already connected

• AT+CIPSERVER: Added close_all_clients parameter to close all connectiones which connected the server created by AT+CIPSERVER

• The following AT commands supports IPv6 since v2.2.0.0

  • AT+CIPV6
  • AT+CIPSTATUS
  • AT+CIPDOMAIN
  • AT+CIPSTART
  • AT+CIPSTARTEX
  • AT+CIPSERVER
  • AT+SAVETRANSLINK
  • AT+PING
  • AT+CIPDNS
  • AT+CIPSTA
  • AT+CIPAP
  • AT+CIFSR

1.3 Application Layer

• AT+CIPSNTPCFG: Support to configure half timezone offset
• AT+MQTTCONNCFG, AT+MQTTPUB, AT+MQTTPUBRAW, AT+MQTTPUB, AT+MQTTUNSUB command supports 128 bytes topic
• AT+WEBSERVER: New command to support Wi-Fi provisioning via SoftAP and Captive Portal
• AT+HTTPCLIENT: Support chunked data
• AT+HTTPCPOST: New command to support long data post

1.4 System

• AT+CMD: New command to query the supported AT commands list
• AT+USERRAM: New command to alloc ram for host mcu to use it
• AT+SYSREG: New command to read and write registers
• AT+SYSRAM: Support to query the minimum heap size
• AT+GMR: Added chip platform information in the response

2. Bugfix

2.1 Wi-Fi

• Fixed AT+CWLAP issues
  • Fixed AT+CWLAP returned ERROR when total active scan time is more than 15 seconds
  • Fixed AT+CWLAP did not return ap in the response sometimes
  • Fixed AT+CWLAP blocked more the 10 seconds sometimes
  • Fixed AT+CWLAP rssi filter parameter could not work sometimes
  • Fixed AT+CWLAP could not scan valid ap by ssid and bssid
• Fixed the issue that AT+CWMODE=1,1 could not auto-connect to AP when Wi-Fi mode switched from WIFI_MODE_NULL
• Fixed the issue that AT+CWJAP may return wrong error number
• Fixed AT+WPS failed on multiple ap credentials case
• Fixed AT+CIPSTA/AT+CIPAP could set wrong IP address due to the lack of rigorous address check

2.2 TCP/IP

• Fixed wrong state of AT+CIPSTATUS command
• Fixed data error in passthrough mode with 2Mbps baud rate
• Fixed AT+CIPRECONNINTV did not work immediately
• Fixed that the received data was incomplete if the data was too large in softAP mode
• Fixed AT+CIPSENDEX data was truncated in advance
• Fixed AT+CIPSEND returned ERROR sometimes
• Fixed crash when link id < 0
• Fixed AT+CIPMUX=0 set error when all connections closed
• Fixed SSL link may not disconnect when IP address changed
• Fixed potential blocking when hardware flow control enabled
• Fixed an issue of mistakenly printing "CLOSED" or "+LINK_CONN"
• Fixed tcp server could not work again if the link closed and opened repeatedly
• Fixed AT+SAVETRANSLINK could not work sometimes
• Fixed AT+CIPSERVER could set mode to 2
• Fixed AT+CIPSTART SSL connect failed if disabled ALPN by AT+CIPSSLCALPN=1,0
• Fixed tcp send data lost in passthrough mode

2.3 Application Layer

• Fixed AT+MQTTCONN returned ERROR when checking common name
• Fixed AT+MQTTUSERCFG? crash after MQTT connected
• Fixed AT+CIPSSLCALPN query command caused to reboot due to memory coverage
• Fixed AT+MQTTCONN may cause wdt reset when input some special hostname
• Fixed the issue that AT+HTTPCLIENT url failed to be omitted

2.4 System

• Fixed AT+GSLP did not return OK sometimes
• Fixed AT+GSLP may return ERROR when setting a long deep sleep time
• Fixed wrong uart pins disabled before deep-sleep
• Fixed AT+SLEEPWKCFG did not check GPIO configuration issue
• Fixed the crash when sending command with one redundant character "" before "\r\n"
• Fixed AT+SLEEP=2 returned OK in softap mode
• Fixed silence firmware crash sometimes
• Fixed build fail when disable customized partition
• Fixed sdio read data error when length bigger than sdio list

3. Optimization

• Added build.py script to simplify the compilation process and supported windows OS compilation
• Refactored application directory
• Removed deprecated GNU make
• Supported spi & sdio example cmake
• Removed at_http_webserver example