ESP32 Forum

areguy wrote: ↑

Sun Mar 17, 2019 11:01 am

As I known, esp-idf has supported (CSI) channel state information.

I just follow the WiFi documentation wifi.rst in esp-idf directory to modify the given example "station" to get channel state information.
It works well, but it could not receive any CSI from my another chip, to which I upload another example "softAP".

In the example "softAP", I have tried hard to do something to make it better(maybe,i dont konw)
For example, select Wi-Fi CSI enble in menuconfig or add 'esp_wifi_set_csi(true)', even 'esp_wifi_set_promiscuous(true)'
However, these methods make on sense

Also, I search related questions in the Internet and read the ESP-IDF Programming Guide over and ever again, but can't find the solution.

I'm really a newbie on this field,and it's my first time to post question here.
HOPE SOMEONE CAN HELP ME! THANKS

The CSI is extracted from received packet.

esp_err_tesp_wifi_80211_tx(wifi_interface_tifx, const void *buffer, int len, bool en_sys_seq)

areguy wrote: ↑

Mon Mar 18, 2019 8:17 am

The CSI is extracted from received packet.

First,thank you for your reply!

I think that's exactly the key of my question.
Now, I think i'd better receive CSI in the softAP, and use another chip as station to connect to this AP.
In this way, I can send UDP data from my station to my softAP, which may let me able to contral the speed of CSI update.

BUT, I dont know the default ip address of the softAP(maybe 192.168.4.1? I've tried,not work), or which port i should should send to.
By the way, whether the function

Code: Select all

esp_err_tesp_wifi_80211_tx(wifi_interface_tifx, const void *buffer, int len, bool en_sys_seq)

can also satisfy my need?If so, I'm supposed to learn the format of raw ieee80211 data.SAD!