First of all, you must specify a pin for a sensor. It is the SDA pin. Then it would help if you defined the SCL pin. For example, output 4 – BME280, and output 5 – I2C SCL.
If you connect several sensors on one bus (pin), you may define the SCL pin only once.
Zigbee: Accepts the “read” and “write” commands on the endpoint for the SDA pin.