Modbus Sniffer

Some devices, such as energy meters, solar inverters, and semi-industrial equipment, incorporate Modbus communication.
Modbus is the protocol, and RS485 is the wiring.
In this video, we'll connect to this communication to detect the data being exchanged between these devices.
If we have the register table of a specific slave device, we can see the order of requests and interpret the data. Even without this table, we can likely deduce much of the data through reverse engineering.
We've created a program in the Arduino IDE for the ESP8266.
This program creates a Wi-Fi network that, when connected, reads the data exchanged and displays it on a web page. We can also download it in .csv format.
We're using a TTL to RS485 board and an ESP01_Relay, which consists of a board with the ESP8266 microcontroller, a 3.3V voltage regulator, and a relay.
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Video showing the physical connection:
https://youtu.be/Iaa7PQ1VivY

Electrical connection diagrams:
https://drive.google.com/file/d/1oFz0J4mWLr2H1VECVSnjvalcG8O57d0a/view?usp=sharing

Here is the link to the mounting bracket:
https://www.thingiverse.com/thing:6207450
This version of the bracket has a space for an electronic board to house the connections and the DS18B20 temperature probe resistor.

The code to paste into the Arduino IDE:
https://drive.google.com/file/d/1KSmqzDXGoaskVogRPoElFh9FtZI2oEIp/view?usp=sharing

Additional Boards URLs: Paste into Arduino IDE, Preferences, Additional Boards URLs:
http://arduino.esp8266.com/stable/package_esp8266com_index.json

Libraries required for the Arduino IDE:
https://github.com/ESP32Async/ESPAsyncTCP
https://github.com/ESP32Async/ESPAsyncWebServer

Link to video CAN bus Sniffer with Home Assistant ESPHome:
https://youtu.be/28cLxNDFxuw
"Modbus RTU" "tutorial" "RS485" "ESP8266" "ESP01" "Relay" "RS485 to TTL" "TTL to RS485" "Arduino IDE" "snooper"

Видео Modbus Sniffer канала Progs Pont