ORSSerialPort
Serial port library for Objective-C and Swift macOS apps
...It is useful for programmers writing Objective-C or Swift Mac apps that communicate with external devices through a serial port (most commonly RS-232). You can use ORSSerialPort to write apps that connect to Arduino projects, robots, data acquisition devices, ham radios, and all kinds of other devices. Using ORSSerialPort to open a port and send data can be very simple. ORSSerialPort is released under an MIT license, meaning you're free to use it in both closed and open-source projects. However, even in a closed-source project, you must include a publicly-accessible copy of ORSSerialPort's copyright notice, which you can find in the LICENSE file. ...