It mainly depends on the product quality, there are many brands and types of esp32 from different suppliers. We have tested the old version ESP8266 in the indoor environment and its connectivity range was less than 20 meters.

Dear Bidyut Saha ,

There are some experiments implemented to see the range for indoor and outdoor according to bellow links, for outdoor without walls it could be 150 meters and indoor with one wall between after 15 meter it is decreased incredibility :

https://blog.honzamrazek.cz/2017/08/testing-the-wifi-range-of-esp32/

https://www.instructables.com/ESP32-8266-WiFi-Signal-Strength/

I hope it could be useful,

Best.

For non-line of sight it depends on a lot of factors eg, the number of walls, materials used for the walls, reflection indexes and absorption indexes, even weather, humidity, placement of equipment and the receiver characteristics. In short, it is very difficult to have a perfect answer to your question. if you can provide a bit of information on the set up then it will be much better. The frequency band also determines the skin depth of the signal.

The WiFi coverage range of ESP32 mainly depends on product quality. There are many brands and types of ESP32 from different suppliers. According to the documents, it says in special protocol it can send data over 1 km in line of sight.

50m -200m depending on the antennas.

I have built many applications using NodeMcu. please take a look at the following papers:

1. A. Abusukhon, A. Al-Fuqaha, B. Hawashin, A Novel Technique for Detecting Underground Water Pipeline Leakage Using the Internet of Things. Journal of Universal Computer Science (JUCS).

2. A. Abusukhon, IOT Bracelets for Guiding Blind People in an Indoor Environment, in Journal of Communications Software and Systems, vol. 19, no. 2, pp. 114-125, April 2023, doi: 10.24138/jcomss-2022-0160.

3. Ahmad Abusukhon, Bilal Hawashin and Mohammad Lafi (2021) An Efficient Algorithm for Reducing the Power Consumption in Offices Using the Internet of Things, International Journal of Advances in Soft Computing and its Applications (IJASCA). http://ijasca.zuj.edu.jo/Volumes.aspx

4. A. Abusukhon (2021) Towards Achieving a Balance between the User Satisfaction and the Power Conservation in the Internet of Things, IEEE Internet of Things Journal, doi: 10.1109/JIOT.2021.3051764. impact factor 9.936. Published by IEEE. https://ieeexplore.ieee.org/document/9326414. [Science Citation Index].

Hope this is helpful