📅Update: 2020/09/18
Dwell pauses the command queue and waits for a period of time.
If both S and P are included, S takes precedence.
G4 [P<time in ms>] [S<time in sec>]
[P<time in ms>] Amount of time to dwell
[S<time in sec>] Amount of time to dwell
G4 P500 ; Dwell for 1/2 second