I have a problem at work where I need to perform series of sequential tasks on different devices. These devices do not need to interact with each other and also each of the sequential tasks can be performed on each of the devices independently.

Assuming I have Tasks (A->B->C->D)(Ex: End of A triggers B and end of B triggers C and so on), Devices(dev1, dev2) can execute these tasks independent of each other.

How can I design a centralized system that executes each task on each device. I cannot use Threading or Multiprocessing due to Infra limitations.
I'm looking for some design suggestions(Classes) and How I can go about designing it.
First approach I thought about was brute force where I blindly use loops to loop over devices and perform each task.
Second approach I was reading about State Design Pattern and I was not sure how I can implement it.

EDIT: I have implemented the answer I have provided below. However I would like to know the correct way to transfer information between states. I know states needs to be mutually exclusive but each task needs to access certain resources that are common amongst all the resources. How can I structure this ?