View scheduler in SmartDashboard

[grantf]

@jwakeman

I am experiencing the same symptom you are. It seems that any interaction with the SmartDashboard results in a robot crash. I have confirmed that the code I have works as expected (no watchdog issues) when SmartDashboard is not involved, but results in the dreaded "Watchdog Not Fed" symptom when even the simplest of lines is added (I went 1 level deeper to avoid using any of the code in the scheduler, just in case that was the problem - CommandBase::asp_accumulatorSubsystem is a sub-class of Subsystem and is therefore a subclass of SmartDashboardNamedData, so it fits the PutData() method signature):

void
WsRobot::RobotInit(void)
{
    this->GetWatchdog().SetExpiration(1.0);
    this->GetWatchdog().SetEnabled(true);
    SmartDashboard::GetInstance()->PutData(CommandBase::asp_accumulatorSubsystem);
}

TeleopPeriodic()
{
    this->GetWatchdog().Feed();
}

As soon as I push even 1 button that causes the Accumulator subsystem to activate, the code crashes. Here are the errors I get on the Driver Station Diagnostics window (it appears that the errors are to be read from the bottom up):

ERROR: A timeout has been exceeded: NetworkTables watchdog expired... disconnecting ...in WatchdogTaskRun() in C:/WindRiver/workspace/WPILib/NetworkTables/Connection.cpp at line 567
ERROR: A timeout has been exceeded: NetworkTables watchdog expired... disconnecting ...in WatchdogTaskRun() in C:/WindRiver/workspace/WPILib/NetworkTables/Connection.cpp at line 567
ERROR: Task error: Task already deleted.: FRC_NetworkTablesWriteTask ...in HandleError() in C:/WindRiver/workspace/WPILib/Task.cpp at line 190
ERROR: Error reading NetworkTables socket: errno=54 ...in Read() in C:/WindRiver/workspace/WPILib/NetworkTables/Reader.cpp at line 70
ERROR: NetworkTables data stream is corrupt: Unexpected ID ...in GetTable() in C:/WindRiver/workspace/WPILib/NetworkTables/Connection.cpp at line 534

Then it seems like the timeout error occurs repeatedly - because the Robot Task is dead due to the watchdog issue.

I posted a FIRST-Forge bug/artifact here: