You should define a pin for a sensor first. It is the SDA pin. Then you should define the SCL pin. For example, output 4 – BME280, and output 5 – I2C SCL.

I2C configuration for a sensor

If you connect several sensors on one bus (pin) you may define the SCL pin only once.

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I2C configuration for sensors on one bus

Zigbee: Accepts the “read” and “write” commands on the endpoint for the SDA pin.

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