At first im only using 1 NFC PN532 and libnfc as the library, but when im trying to connect it to 2 same devices, it still gives the same address which is 0x24(because of libnfc). Since controlling it need unique address, i tried to find a way to change it. And i come to final answer which it is fixed address(hard code in the chip), to solve it i can only use raspberry gpio as additional bus but it only make the device connected to it limited. So i use another option that is to use I2C expander/multiplexer, the mux i use is TCA9548A. But now im wondering how to do this, any advice what should i do and how to do it? And when using i2cdetect it only detects mux address, is it normal?