@spec execute(t()) ::
  {:event, new_state :: t(),
   BACnet.Protocol.NotificationParameters.FloatingLimit.t()}
  | {:delayed_event | :no_event, new_state :: t()}

Calculates the new state for the current state and parameters. Prior to this function invocation, the state should have been updated with update/2, if any of the properties has changed.

Please note that the actual setpoint needs to be set through update/2, as no lookup will occur (and can not), so the actual active setpoint as float, needs to be set in the state.

:delayed_event helps identifying whether the algorithm needs to be called periodically in order to overcome the time_delay and trigger a state change. As soon as :event or :no_event is given as flag, it means the caller can go back to event orientated calling.

The status_flags field of the notifications parameters is updated from the state with the correct in_alarm state, however to ensure the Status Flags have an overall correct status, the user has to make sure all bits are correctly.

ASHRAE 135:

The conditions evaluated by this event algorithm are:

(a) If pCurrentState is NORMAL, and pMonitoredValue is greater than (pSetpoint + pHighDiffLimit) for pTimeDelay, then indicate a transition to the HIGH_LIMIT event state.

(b) If pCurrentState is NORMAL, and pMonitoredValue is less than (pSetpoint - pLowDiffLimit) for pTimeDelay, then indicate a transition to the LOW_LIMIT event state.

(c) Optional: If pCurrentState is HIGH_LIMIT, and pMonitoredValue is less than (pSetpoint - pLowDiffLimit) for pTimeDelay, then indicate a transition to the LOW_LIMIT event state.

(d) If pCurrentState is HIGH_LIMIT, and pMonitoredValue is less than (pSetpoint + pHighDiffLimit - pDeadband) for pTimeDelayNormal, then indicate a transition to the NORMAL event state.

(e) Optional: If pCurrentState is LOW_LIMIT, and pMonitoredValue is greater than (pSetpoint + pHighDiffLimit) for pTimeDelay, then indicate a transition to the HIGH_LIMIT event state.

(f) If pCurrentState is LOW_LIMIT, and pMonitoredValue is greater than (pSetpoint - pLowDiffLimit + pDeadband) for pTimeDelayNormal, then indicate a transition to the NORMAL event state.

@spec new(float(), BACnet.Protocol.EventParameters.FloatingLimit.t()) :: t()

Creates a new algorithm state.

@spec update(t(), Keyword.t()) :: t()

Updates the state using the given parameters (monitored_value, parameters, setpoint, status_flags).