[examples] Enable NT Flush in Field2d examples (#3013)

wpilibcExamples/src/main/cpp/examples/SimpleDifferentialDriveSimulation/cpp/Robot.cpp

@@ -14,6 +14,10 @@
 class Robot : public frc::TimedRobot {
  public:
   void RobotInit() override {
+    // Flush NetworkTables every loop. This ensures that robot pose and other
+    // values are sent during every iteration.
+    SetNetworkTablesFlushEnabled(true);
+
     m_trajectory = frc::TrajectoryGenerator::GenerateTrajectory(
         frc::Pose2d(2_m, 2_m, 0_rad), {}, frc::Pose2d(6_m, 4_m, 0_rad),
         frc::TrajectoryConfig(2_mps, 2_mps_sq));

wpilibcExamples/src/main/cpp/examples/StateSpaceDifferentialDriveSimulation/cpp/Robot.cpp

@@ -9,7 +9,11 @@
 #include <frc/smartdashboard/SmartDashboard.h>
 #include <frc2/command/CommandScheduler.h>
 
-void Robot::RobotInit() {}
+void Robot::RobotInit() {
+  // Flush NetworkTables every loop. This ensures that robot pose and other
+  // values are sent during every iteration.
+  SetNetworkTablesFlushEnabled(true);
+}
 
 /**
  * This function is called every robot packet, no matter the mode. Use

wpilibjExamples/src/main/java/edu/wpi/first/wpilibj/examples/simpledifferentialdrivesimulation/Robot.java

@@ -33,6 +33,10 @@ public class Robot extends TimedRobot {
 
   @Override
   public void robotInit() {
+    // Flush NetworkTables every loop. This ensures that robot pose and other values
+    // are sent during every iteration.
+    setNetworkTablesFlushEnabled(true);
+
     m_trajectory =
         TrajectoryGenerator.generateTrajectory(
             new Pose2d(2, 2, new Rotation2d()),

wpilibjExamples/src/main/java/edu/wpi/first/wpilibj/examples/statespacedifferentialdrivesimulation/Robot.java

@@ -26,6 +26,10 @@ public class Robot extends TimedRobot {
     // Instantiate our RobotContainer.  This will perform all our button bindings, and put our
     // autonomous chooser on the dashboard.
     m_robotContainer = new RobotContainer();
+
+    // Flush NetworkTables every loop. This ensures that robot pose and other values
+    // are sent during every loop iteration.
+    setNetworkTablesFlushEnabled(true);
   }
 
   @Override