System modes help you control how the device manages the connection with the cloud.
By default, the device connects to the Cloud and processes messages automatically. However there are many cases where a user will want to take control over that connection. There are three available system modes:
MANUAL. These modes describe how connectivity is handled.
These system modes describe how connectivity is handled and when user code is run.
System modes must be called before the setup() function. By default, the device is always in