ESP32 Forum

Posted: **Wed Oct 11, 2017 11:27 am**

Hello, I tried to add libmodbus as component to ESP-IDF environment, but compilation throws me this errors:

$ make all
CC build/modbus/modbus-tcp.o
C:/msys32/opt/esp/esp-idf/components/modbus/modbus-tcp.c:31:24: fatal error: sys/ioctl.h: No such file or directory
compilation terminated.
make[1]: *** [/opt/esp/esp-idf/make/component_wrapper.mk:243: modbus-tcp.o] Error 1
make: *** [C:/msys32/opt/esp/esp-idf/make/project.mk:421: component-modbus-build] Error 2

How it can be fixed or maybe another esp32-friendly lib is present?

Posted: **Wed Nov 08, 2017 5:42 pm**

Hello Playmean,
Did you have a success with libmodbus? I'm looking for a Modbus library that people have successfully used with esp32.
Please share your experience.
Thanks in advance.

Posted: **Thu Nov 30, 2017 8:08 pm**

I'm also interested in this.

I've used libmodbus a bunch in a linux environment, but it needs some non-trivial tweaks to get it to work on the esp32. Unfortunately some of the basic libraries are not yet implemented, so its either a case of heavily modifying libmodbus to workaround these missing components, or implementing the underlying libraries for the architecture.

Posted: **Mon Mar 05, 2018 6:18 pm**

Hello,

Did anyone get this working? We're also in need of such library for ESP32 ESP-IDF platform.

Thanks!

Posted: **Sat Aug 17, 2024 6:49 pm**

Hi,

working on it.
seems reasonable effort to port libmodbus to ESP-IDF.

i will publish once running.

Posted: **Sun Aug 18, 2024 9:12 pm**

running.

https://github.com/stephane/libmodbus/issues/767

Example for modbus-tcp: https://github.com/Fliegl-Agrartechnik- ... modbus-tcp

Example for modbus-rtu: https://github.com/Fliegl-Agrartechnik- ... modbus-rtu

ESP32 Forum

ESP-IDF libmodbus compatibility

ESP-IDF libmodbus compatibility

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