4.9.16 While using mobile’s hotpot for an ESP32 to download the OTA rmware, after a few
seconds when turning of the hotspot and restarts ESP32, the program sticks in the OTA
operation (the same situation for plugging and unplugging the wan port network cable when
using a router), why? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
4.9.17 Which GPIOs can be used to wake up ESP32-C3 from Deep-Sleep mode? . . . . . . . . 119
4.9.18 When using the ESP-WROOM-02D module with a battery for power supply, are there any
risks in frequently formatted reading and writing ash as the battery is low (the module
barely starts up)? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
4.9.19 How to check the maximum stack size used by a thread for ESP32? . . . . . . . . . . . . 120
4.9.20 What is the meaning of the ”SW_CPU_RESET”log when using ESP32? . . . . . . . . 120
4.9.21 For ESP32 products, when testing NVS separately, I found it occupies a lot of memory.
What is the reason? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
4.9.22 How do I change the system time of a module ? . . . . . . . . . . . . . . . . . . . . . . 121
4.9.23 During the OTA upgrade process, an ESP_ERR_OTA_VALIDATE_FAILED error oc-
curred after calling esp_ota_end, how to troubleshoot such issue? . . . . . . . . . . . . . 121
4.9.24 How does ESP8266-RTOS-SDK store data to RTC memory? . . . . . . . . . . . . . . . 121
4.9.25 After waking up from Deep-sleep mode, where does ESP8266 start boot? . . . . . . . . . 121
4.9.26 When will the RTC clock be reset? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
4.9.27 After using the AT+GSLP command to enter Deep-sleep mode for ESP32, can it be awak-
ened by pulling down the EN pin? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
4.9.28 When multiple threads want to use the watchdog of ESP32, should each thread enable the
watchdog individually? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
4.9.29 When using the release/v3.3 version of ESP8266-RTOS-SDK, how to enter Light-sleep
mode? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
4.9.30 How to wake up ESP8266 in Deep sleep mode? . . . . . . . . . . . . . . . . . . . . . . 122
4.9.31 When using the ESP32-WROVER module, there is a problem of battery jitter or abnormal
power-o and power-on, causing the system to crash and fail to wake up. What is the reason?122
4.9.32 How to ash a customized mac address? . . . . . . . . . . . . . . . . . . . . . . . . . . 122
4.9.33 When ESP32 uses esp_timer, network communication or Bluetooth communication is ab-
normal. What is the reason? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
4.9.34 With ESP32, are there any return instructions if I skip to a function using the jump in-
struction in ULP？ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
4.9.35 How to adjust the warning level for project build? . . . . . . . . . . . . . . . . . . . . . . 123
4.9.36 The rmware compiled based on the ESP-IDF SDK varies as it contains the information
about IDF_PATH and compilation time. How to remove that information? . . . . . . . . 123
4.9.37 When I downloaded the ocial application hello_world using ESP32-S3-DevKitM-1, the
following error occurred. What is the reason for that? . . . . . . . . . . . . . . . . . . . 123
4.9.38 What is the accuracy of the internal 150 kHz RTC of ESP32 series chips? . . . . . . . . . 124
4.9.39 What versions of esp-idf SDK are supported by ESP32-D0WDR2-V3 chip? . . . . . . . 124
4.9.40 When I test OTA applications based on the ESP32 chip, can I delete the default factory
partition in the partition table and set the address of the OTA_0 partition to 0x10000? . . 124
4.9.41 Why can I not burn data to BLOCK3 of ESP32-C3 eFuse with espefuse.py
burn_key? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
4.9.42 Why do dierent ESP32 modules have dierent ash erase time? . . . . . . . . . . . . . 124
4.9.43 Why I encountered the following error after I run the rmware based on the esp-idf SDK? 124
4.10 Wi-Fi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
4.10.1 Do ESP32 and ESP8266 support Chinese SSID for Wi-Fi? . . . . . . . . . . . . . . . . 125
4.10.2 How much time does an ESP32 scan take? . . . . . . . . . . . . . . . . . . . . . . . . . 125
4.10.3 [Scan] Do Espressif’s products support boundary scans? . . . . . . . . . . . . . . . . . 125
4.10.4 What is the denition for Wi-Fi channel? Can I select any channel of my choice? . . . . . 125
4.10.5 [LWIP] With ESP-IDF v4.1, how to congure ESP32’s IP address when it is in SoftAP
mode? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
4.10.6 [LWIP] How to congure ESP32’s static IP when it is in Station mode？ . . . . . . . . 126
4.10.7 [LWIP] How to congure the Option contents of DHCP Server in ESP-IDF? . . . . . . . 126
4.10.8 [Performance] How to test the bit rate of Wi-Fi modules? . . . . . . . . . . . . . . . . . 127
4.10.9 [LWIP] What is the default IP address of ESP8266 SoftAP? . . . . . . . . . . . . . . . . 127
4.10.10 [Connect] How many devices is ESP8266 able to connect in SoftAP mode? . . . . . . . . 127
4.10.11 Do ESP8266/ESP32/ESP32-S2/S3/C2/C3 support web/SoftAP provisioning? . . . . . . . 128
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