Espressif Systems ESP - Page 142

Chapter 4. Software framework
4.10 Wi-Fi
4.10.1 Do ESP32 and ESP8266 support Chinese SSID for Wi-Fi?
Both ESP32 and ESP8266 support Chinese SSID, but you need to use corresponding libraries and im-
plement some settings. It should be noted you need to make special con󰝘gurations when using Chinese
SSID as Chinese characters occupy di󰝗erent numbers of bytes.
For ESP32, you can use the Wi-Fi related API provided by ESP-IDF. When connecting AP, you can use
the fuction esp_wi󰝘_set_con󰝘g() to set Wi-Fi. The SSID parameter can be set to Chinese characters.
For example,
wifi_config_t wifi_config = {
.sta = {
.ssid = "你好，世界",
.password = "password123",
},
};
ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config));
4.10.2 How much time does an ESP32 scan take?
The total time for scanning depends on:
• Active scan (by default) or passive scan.
• The time spent on each channel is 120 ms for active scanning and 360 ms for passive scanning.
• The country code and con󰝘gured channel range from 1~13 channels (by default).
• Fast scan (by default) or full-channel scan.
• Station mode or Station-AP mode, and if any active connections are currently maintained.
By default, channels 1 to 11 use active scans, and channels 12 to 13 use passive scans.
• In the absence of connection in Station mode, the total time for a full-channel scan is: 11*120 +
2*360 = 2040 ms.
• With active connections in Station mode or Station-AP mode, the total time for a full-channel scan
is: 11*120 + 2*360 + 13*30 = 2430 ms.
4.10.3 [Scan] Do Espressif’s products support boundary scans?
No, they don’t.
4.10.4 What is the denition for Wi-Fi channel? Can I select any channel of my choice?
• A Wi-Fi channel is a frequency range used for wireless communication. Di󰝗erent countries and regions have
regulations on the available Wi-Fi channels. For example, in North America, the Wi-Fi channel ranges from
1 to 11, while in Europe, the Wi-Fi channel ranges from 1 to 13. For more details, please refer to ESP8266
Wi-Fi Channel Selection Guidelines.
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