How can I send empty mqtt message to broker to delete some retained message?
I tried following but it is not working:

Attaching a 0.1 micro farad non polar capacitor between GPIO and sensor made a lot of difference. Can someone please lead me to industrial moisture sensor circuit resources? Reading while moisture sensor in air: eFuse Two Point: NOT supported eFuse Vref: Supported Characterized using eFuse Vref Raw ...

Thanks for reply. Yes, I want to know why it is changing so wildly when the condition of moisture sensor is static.
Shouldn't it give same value ideally?

I am using example of adc in asp idf 3.2, as given here https://github.com/espressif/esp-idf/tree/release/v3.2/examples/peripherals/adc . I am using Esp32 devkit v1 and my moisture sensor is identical to this https://www.aliexpress.com/item/Free-Shipping-Soil-Hygrometer-Humidity-Detection-Module-Moi...

Thanks ESP_Angus. For the benefit of any one following this thread, I copy lines from pages you referred. If a required feature is not yet available in a stable release, but you don’t want to use the master branch, it is possible to check out a pre-release version or a release branch. In stability t...

Thank you. Any tentative date for release of 3.2?

Thanks a lot for your quick response ESP_cermak. I think I will use 3.2 branch as I hope it will be released sometime soon :? . Is 3.2 is the same as master branch? I hope at the time of release, it will have full working MQTT, HTTP SERVER and all that is available in arduino environment and we are ...

I was surprised to find out that MQTT is not available in current stable version 3.1.2 (or 3.1.3) of ESP-IDF , though it is available in latest version. When we can expect to have MQTT in stable version? What are prerelease versions? Can I use them safely in production? I used MQTT in ARDUINO enviro...

I also started with Arduino, and I consider myself as beginner. I would say , if you are planning to go all the way then go for ESP IDF from the start. You will have to be proficient with C language and FreeRTOS. You can learn these as you go.

Thank you.