I2C Slave Library Not Working

[matt-s-SNAP]

I'm trying to set up an Olimex-POE module to work as an I2C slave. The docs provide an example of an I2C slave programme (https://docs.espressif.com/projects/ard ... eslave-ino). However, when I try to compile it it gives me the error:

Code: Select all

'class TwoWire' has no member named 'slaveWrite'

If I comment that line out, it also gives me the compilation error

Code: Select all

sketch/Olimex_Module.ino.cpp.o:(.literal._Z5setupv+0x1c): undefined reference to `TwoWire::onReceive(void (*)(int))'
sketch/Olimex_Module.ino.cpp.o:(.literal._Z5setupv+0x20): undefined reference to `TwoWire::onRequest(void (*)())'
sketch/Olimex_Module.ino.cpp.o: In function `setup()':
<my sketch path>/Olimex_Module/Olimex_Module.ino:38: undefined reference to `TwoWire::onReceive(void (*)(int))'
<my sketch path>/Olimex_Module/Olimex_Module.ino:38: undefined reference to `TwoWire::onRequest(void (*)())'
collect2: error: ld returned 1 exit status
exit status 1
Error compiling for board OLIMEX ESP32-PoE.

Given that this is example code, I'm not sure how it could be failing. Maybe it's not reading the ESP32 wire library correctly?
Any help would be greatly appreciated.

[aahmed7]

You need to install the latest development branch for this to work.

Check the following:
https://docs.espressif.com/projects/ard ... rduino-ide

You need to add the Development release link in the arduino ide boards.json and install the release 2.0.1-rc1 or later as these methods were added in this release. check the tag here:

https://github.com/espressif/arduino-es ... 041acce830