Make SendableChooser dashboard widget have priority over robot

[bradamiller]

Make SendableChooser dashboard widget have priority over robot

[AustinShalit]

Could we flag the selected value as persistent to achieve the result?

[ThadHouse]

Persistent values wouldn't work for this in certain cases. For instance, if the persistent value is set to mode 2, but the SmartDashboard selects mode 3 for the next match, mode 2 would be the one selected. This is because when a client connects to a server it overwrites any client entries with ones the server has.

One way to solve this would be to use SetDefault on the RobRio side to set the value at startup, and then a change in the NetworkTables protocol to allow certain values to be flagged as client override, where if the server is sending a value on initial connection that exists on the client already, the client ignores it, and sends the proper value back to the server.

@PeterJohnson what do you think?

[bradamiller]

I was thinking that if the user explicitly set the value in the UI in the dashboard, they meant it to have that value and it shouldn't get overridden by the default value that is in the robot on startup.

[AustinShalit]

Closes with wpilibsuite/SmartDashboard#6

[PeterJohnson]

wpilibsuite/SmartDashboard#6 has been merged.