@pizzaprogram/mcp-pcf-aio
Node-Red node for multiple MCP23017 chips (each 16 input or output) + PCF8574(A) (8 I/O). The I2C Bus number can be specified too.
homebridge-mcp-contact-sensor
a homebridge(https://github.com/nfarina/homebridge) plugin for a contact sensor and motion sensor via mcp23017 i2c port for Raspberry Pi.