Function pamoja_controller_setpoint 

#[unsafe(no_mangle)]
pub extern "C" fn pamoja_controller_setpoint(
    setpoint: f32,
    hysteresis: f32,
    cooling: bool,
    safe_band: f32,
) -> *mut PamojaController

Creates a controller that holds a reading near a setpoint.

Arguments

• setpoint - the target reading.
• hysteresis - half the deadband width, which stops the output chattering.
• cooling - whether the output cools rather than heats.
• safe_band - how far the reading may stray before an alert.

Returns

A handle the caller must release with pamoja_controller_free.