ESP32-C3 AT Release v2.3.0.0

Documentation for Release v2.3.0.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v2.3.0.0_esp32c3/

ESP32-C3 AT v2.3.0.0 is a major update for ESP32-C3 AT v2.2.0.0.

The firmwares:
ESP32-C3-MINI-1_AT_Bin_V2.3.0.0.zip

Changelog

This is the list of changes since release v2.2.0.0:

Breaking Changes

• esp-idf version updated to release v4.3 (98d34e5).

Known Issue

• AT+WPS=1 cannot join the AP if you press the WPS button first and then set the AT+WPS=1 command.

1. Feature

1.1 Wi-Fi

• Added AT+CWSTATE command to query Wi-Fi state
• AT+CWSTARTSMART: Added ESP-Touch v2 support

1.2 TCP/IP

• Enlarged AT+CIPSEND command send size to 8 KiB
• Added AT+CIPSTATE command to query connection state
• Added AT+CIPSENDL and AT+CIPSENDLCFG command to support long data send
• Added passthrough mode support when AT as server but only have one connection

1.3 Application Layer

• Added AT+MQTTALPN command to support MQTT ALPN
• Added AT+HTTPURLCFG command to configure long URL
• Added AT+HTTPCGET command to support HTTP GET request
• AT+HTTPCLIENT: <content-type> parameter can be omitted
• Added AT+CIPSNTPINTV command to configure SNTP sync interval
• Added AT+USEROTA command to support the upgrade of custom URL
• Added fallback DNS server, AT has two DNS servers ("208.67.222.222" and "8.8.8.8") by default

1.4 System

• Added AT+SLEEP query command
• Configured external 32 KHz crystal to support light sleep
• Modified ESP32-C3 partition for silence mode to accommodate larger firmware

1.6 Bluetooth

Added the following Bluetooth® Low Energy AT Commands. If you upgraded to v2.3.0.0 from v2.2.0.0, please update ble_data partition according the guide before you use Bluetooth LE.

• AT+RFPOWER command added BLE power set.
• AT+BLEINIT: Bluetooth LE initialization.
• AT+BLEADDR: Query/Set Bluetooth LE device address.
• AT+BLENAME: Query/Set Bluetooth LE device name.
• AT+BLESCANPARAM: Query/Set parameters of Bluetooth LE scanning.
• AT+BLESCAN: Enable Bluetooth LE scanning.
• AT+BLESCANRSPDATA: Set Bluetooth LE scan response.
• AT+BLEADVPARAM: Query/Set parameters of Bluetooth LE advertising.
• AT+BLEADVDATA: Set Bluetooth LE advertising data.
• AT+BLEADVDATAEX: Automatically set Bluetooth LE advertising data.
• AT+BLEADVSTART: Start Bluetooth LE advertising.
• AT+BLEADVSTOP: Stop Bluetooth LE advertising.
• AT+BLECONN: Establish Bluetooth LE connection.
• AT+BLECONNPARAM: Query/Update parameters of Bluetooth LE connection.
• AT+BLEDISCONN: End Bluetooth LE connection.
• AT+BLEDATALEN: Set Bluetooth LE data packet length.
• AT+BLECFGMTU: Set Bluetooth LE MTU length.
• AT+BLEGATTSSRVCRE: Generic Attributes Server (GATTS) creates services.
• AT+BLEGATTSSRVSTART: GATTS starts services.
• AT+BLEGATTSSRVSTOP: GATTS Stops Services.
• AT+BLEGATTSSRV: GATTS discovers services.
• AT+BLEGATTSCHAR: GATTS discovers characteristics.
• AT+BLEGATTSNTFY: Notify a client of the value of a characteristic value from the server.
• AT+BLEGATTSIND: Indicate the characteristic value from the server to a client.
• AT+BLEGATTSSETATTR: GATTS sets characteristics.
• 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.
• AT+BLESPPCFG: Query/Set Bluetooth LE SPP parameters.
• AT+BLESPP: Enter Bluetooth LE SPP mode.
• AT+BLESECPARAM: Query/Set Bluetooth LE encryption parameters.
• AT+BLEENC: Initiate Bluetooth LE encryption request.
• AT+BLEENCRSP: Respond to the pairing request from the peer device.
• AT+BLEKEYREPLY: Reply the key value to the peer device.
• AT+BLECONFREPLY: Reply the confirm value to the peer device in the legacy connection stage.
• AT+BLEENCDEV: Query bonded Bluetooth LE encryption device list.
• AT+BLEENCCLEAR: Clear Bluetooth LE encryption device list.
• AT+BLESETKEY: Set Bluetooth LE static pair key.
• AT+BLEHIDINIT: Bluetooth LE Human Interface Device (HID) profile initialization.
• AT+BLEHIDKB: Send Bluetooth LE HID keyboard information.
• AT+BLEHIDMUS: Send Bluetooth LE HID mouse information.
• AT+BLEHIDCONSUMER: Send Bluetooth LE HID consumer information.
• AT+BLUFI: Start or Stop BluFi.
• AT+BLUFINAME: Query/Set BluFi device name.

2. Bugfix

2.1 Wi-Fi

• Fixed that AT+CWLAP returned ERROR sometimes.
• Fixed that AT+CWJAP returned wrong error sometimes.
• Fixed an issue of auto connecting to WPA2 Enterprise AP. Users should always use AT+CWJEAP to connect to a WPA2 Enterprise AP.
• Fixed a potential crash when the length of SSID is 32 bytes or password is 64 bytes.

2.2 TCP/IP

• Fixed that AT+CIPSERVER=0,1 should only close clients connected to ESP TCP server.
• Fixed that active write TCP data in passive mode.
• Fixed occasional crash in passthrough mode due to socket close.
• Fixed that OK and > responses are interrupted by other data.
• Fixed that setup AT+CIPSERVER=5 returned "Have 255 Connections".
• Fixed that AT+CIPTCPOPT send timeout parameter cannot work sometimes.
• AT+CIUPDATE: Fixed the failure to do non-blocking OTA due to omitted parameters.

2.3 Application Layer

• AT+HTTPCPOST: Fixed that the new content-type did not take effect due to the default content-type was set incorrectly.
• Removed extra space in AT+HTTPCLIENT HEAD response.
• Fixed that AT+CIPDNS query command returned wrong config.
• Fixed the crash caused by setting wrong URLs in AT+HTTPCLIENT.

2.4 System

• Fixed a potential "busy p" issue.
• Fixed the issue of high power consumption after power on when set AT+CWMODE=0.

2.5 Tools

• Fixed the GitHub Actions compilation failure due to required python packages.

3. Optimization

• Added parameters check for AT+WPS command.
• Added parameters check for AT+CIPSERVER command.
• Added parameters check for AT+CIPTCPOPT command.
• Reduced potential NVS write at startup when NVS read the dirty data.
• Use esp-netif and esp-event to layer instead of tcpip adapter.