In order for the PCA9548 in the Opisthenar not to clash with the address on the central Hub you have to assign a different address to it. By setting
Right now they are configured as in the main hub, giving you the address
You can, for example, pull the MSB (
A2) to VCC to obtain
Only one branch from the central hub is open at any given time, so both hands won't clash between each other.
Let me know If I answered your question this time.
PS: In this project the complicated names for the different components are already the norm, but where does Opisthenar come from?