HomeMonitor/Weather/SerialReader/Controllers/HealthController.cs

using Microsoft.AspNetCore.Mvc;
using System;

namespace ChrisKaczor.HomeMonitor.Weather.SerialReader.Controllers;

[Route("[controller]")]
[ApiController]
public class HealthController : ControllerBase
{
    private readonly TimeSpan _checkTimeSpan = TimeSpan.FromSeconds(5);

    [HttpGet("ready")]
    public IActionResult Ready()
    {
        return SerialReader.BoardStarted ? Ok() : Conflict();
    }

    [HttpGet("health")]
    public IActionResult Health()
    {
        var lastReading = SerialReader.LastReading;
        var timeSinceLastReading = DateTimeOffset.UtcNow - lastReading;

        return SerialReader.BoardStarted && timeSinceLastReading <= _checkTimeSpan ? Ok(lastReading) : BadRequest(lastReading);
    }
}