Hi, Ive read your project description and also read the data sheet of MSP430FR6989 its a very useful controller with all those features, I am a mechatronics engineer expert in embedded systems and IOT application design with vast experience working with ESPressif chips(01,12E,8266,nodeMCU,32) and arduino IDE.
I have done many projects in the domain of IOT making things wireless and establishing the infrastructure.
Mainly its AT/AT+ commands using serial or we can even use libraries to make things better or SPI for direct programming.
My experience can really help you in completing this project.
Feel free to contact me for further discussions.