Hi,
when I was playing with esp8266, I used I2C scanner for checking occupied I2C addresses (eg. https://gist.github.com/tfeldmann/5411375). I hope you can use same method here.
From source code, you can see that LCD is connected to I2C address 0x3c (https://github.com/bigclownlabs/bcf-sdk/blob/8d8f067a96217205999e267a7af19464c57fbe18/bcl/src/bc_module_lcd.c#L317). But there is probably no list of all devices with their address.
I don’t have any code, compatible with BC now, but maybe in the future…