Wire do not work in a multimaster i2c bus
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Description
I am using Wemos D1 mini with arduino uno (avr 328P) configured as multimaster i2c.
While two avr mcu work as expected, with esp8266 when esp8266 start communication as master seems that it starts regardless of the i2c status or arbitration crashing communication.
I use the last git version with arduino 1.8.8 in a Linux Fedora workstation.
I can check communication with a logic analyzer in a specific situation if required.
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