The Espressif ESP-Modbus Library (esp-modbus) supports Modbus communication in the networks based on RS485, Wi-Fi, Ethernet interfaces. The ESP-IDF component freemodbus has been moved from ESP-IDF since version v5.0 to a separate repository:

Hosted Documentation

The documentation can be found on the link below:

Application Example

The examples below demonstrate the ESP-Modbus library of serial, TCP ports for slave and master implementations accordingly.

Please refer to the specific example for details.

Protocol References

  • Modbus Organization with protocol specifications.