Chapter 4. Software framework
4.10.71 How to test ESP32’s Wi-Fi transmission distance?
• You can use the iperf example and congure the ESP32 device to iperf UDP mode. Then, you can distance
the device continuously to see at which point the Wi-Fi data transmission rate will drop to 0.
4.10.72 What is the maximum length of Wi-Fi MTU for an ESP32 and how to change it?
• The maximum Wi-Fi MTU length for ESP32 is 1500. You can change this value in the LwIP component by
netif > mtu. However, it is not recommended to change this value.
4.10.73 During the on-hook test for an ESP32 device, the following log shows. What does
it mean?
log：
[21-01-27_14:53:56]I (81447377) wifi:new:<7,0>, old:<7,2>, ap:<255,255>,␣
,→sta:<7,0>, prof:1
[21-01-27_14:53:57]I (81448397) wifi:new:<7,2>, old:<7,0>, ap:<255,255>,␣
,→sta:<7,2>, prof:1
[21-01-27_14:53:58]I (81449417) wifi:new:<7,0>, old:<7,2>, ap:<255,255>,␣
,→sta:<7,0>, prof:1
[21-01-27_14:53:59]I (81450337) wifi:new:<7,2>, old:<7,0>, ap:<255,255>,␣
,→sta:<7,2>, prof:1
• The value after new represents the current primary and secondary channel; the value after old
represents the last primary and secondary channel; and the value after ap represents the primary
and secondary channel of the current ESP32 AP, which will be 255 if softAP is not enabled; the
value after sta represents primary and secondary channel of the current ESP32 sta; and prof is
the channel of ESP32’s softAP stored in NVS.
• For the meaning of secondary channel values, please refer to wi_second_chan_t.
• The above log indicates that router is switching between HT20 and HT40 minus. You can check
the Wi-Fi bandwidth setting of the router.
4.10.74 How to disable AP mode when ESP32 is in AP + STA mode?
• This can be done through the conguration of esp_wifi_set_mode(wifi_mode_t mode); function.
• Just call esp_wifi_set_mode(WIFI_MODE_STA);.
4.10.75 After ESP32 used the Wi-Fi function, are all ADC2 channels unavailable?
• When an ESP32 device is using Wi-Fi function, the ADC2 pins that are not occupied by Wi-Fi can be used as
normal GPIOs. You can refer to the ocial ADC Description.
Espressif Systems 140
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