Espressif Systems ESP - 5.3 Hardware design

Chapter 4. Software framework
4.10.60 I’m scanning Wi-Fi on an ESP32 device using release/v3.3 version of ESP-IDF.
When there are some identical SSIDs, same SSID names will show in the Wi-Fi
list repeatedly. Is there an API to lter such repeated names?
• No, same SSID names cannot be 󰝘ltered out since identical SSID names may not mean identical servers. Their
BSSID may not be the same.
4.10.61 Does ESP8266 support EDCF (AC) scheme?
The master version of ESP8266-RTOS-SDK supports EDCF (AC) applications, but no application ex-
amples are provided for now. You can enable Wi-Fi QoS con󰝘guration in menuconfig -> Com-
ponent config -> Wi-Fi to get support.
4.10.62 I’m using the master version of ESP8266-RTOS-SDK to open the WiFi Qos
application to get EDCF support. How does ESP8266 decide which data packet
should be allocated to the EDCF AC category?
• It can be determined by setting IPH_TOS_SET(iphdr, tos).
4.10.63 Using ESP32, how to congure the maximum Wi-Fi transmission speed and sta-
bility without considering memory and power consumption?
• To con󰝘gure the maximum Wi-Fi transmission speed and stability, please refer to How to improve Wi-Fi
performance in ESP-IDF programming guide and set the relevant con󰝘guration parameters in menuconfig.
The option path can be found by searching “/”in the menuconfig interface. The optimal con󰝘guration
parameters need to be tested according to the actual environment.
4.10.64 In Wi-Fi SoftAP mode, how many Station devices can ESP8266 be connected at
most?
• ESP8266 supports up to 8 Station device connections.
4.10.65 How to get CSI data when using ESP32 device in Station mode?
• CSI data can be obtained by calling ‘esp_wi󰝘_set_csi_rx_cb()’. See description in API.
• For speci󰝘c steps, please refer to Espressif CSI examples.
4.10.66 In AP + STA mode, after an ESP32 is connected to Wi-Fi, will the Wi-Fi con-
nection be aected if I enable or disable its AP mode?
• After an ESP32 is connected to Wi-Fi in AP + STA dual mode, AP mode can be enabled or disabled at will
without a󰝗ecting Wi-Fi connection.
Espressif Systems 138
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