FloatingPointData.cs

using System;
using System.Text;
using System.Threading.Tasks;
using Waher.Content;
using Waher.Networking;
using Waher.Networking.MQTT;
using Waher.Runtime.Inventory;
using Waher.Runtime.Language;
using Waher.Things.ControlParameters;
using Waher.Things.SensorData;
 
namespace Waher.Things.Mqtt.Model.Encapsulations
{
    public class FloatingPointData : MqttData
    {
        private double value;
        private byte nrDecimals;
 
        public FloatingPointData()
            : base()
        {
        }
 
        public FloatingPointData(MqttTopic Topic, double Value, byte NrDecimals)
            : base(Topic)
        {
            this.value = Value;
            this.nrDecimals = NrDecimals;
        }
 
        public override Task<DataProcessingResult> DataReported(MqttTopic Topic, MqttContent Content)
        {
            if (CommonTypes.TryParse(Content.DataString, out double x, out byte NrDecimals))
            {
                this.value = x;
                this.nrDecimals = NrDecimals;
                this.Timestamp = DateTime.UtcNow;
                this.QoS = Content.Header.QualityOfService;
                this.Retain = Content.Header.Retain;
 
                return Task.FromResult(DataProcessingResult.ProcessedNewMomentaryValues);
            }
            else
                return Task.FromResult(DataProcessingResult.Incompatible);
        }
 
        public override Task<string> GetTypeName(Language Language)
        {
            return Language.GetStringAsync(typeof(MqttTopicNode), 35, "Floating-point");
        }
 
        public override Task StartReadout(ThingReference ThingReference, ISensorReadout Request, string Prefix, bool Last)
        {
            Request.ReportFields(Last, new QuantityField(ThingReference, this.Timestamp, this.Append(Prefix, "Value"), 
                this.value, this.nrDecimals, string.Empty, FieldType.Momentary, FieldQoS.AutomaticReadout));
        
            return Task.CompletedTask;
        }
 
        public override bool IsControllable => true;
 
        public override ControlParameter[] GetControlParameters()
        {
            return new ControlParameter[]
            {
                new DoubleControlParameter("Value", "Publish", "Value:", "Floating-point value of topic.",
                    (n) => Task.FromResult<double?>(this.value),
                    (n, v) =>
                    {
                        this.value = v;
                        this.Topic.MqttClient.PUBLISH(this.Topic.FullTopic, this.QoS, this.Retain, Encoding.UTF8.GetBytes(CommonTypes.Encode(v, this.nrDecimals)));
                        return Task.CompletedTask;
                    })
            };
        }
 
        public override void SnifferOutput(ICommunicationLayer Output)
        {
            this.Information(Output, this.value.ToString());
        }
 
        public override Grade DefaultSupport => Grade.Excellent;
 
        public override IMqttData CreateNew(MqttTopic Topic, MqttContent Content)
        {
            IMqttData Result = new FloatingPointData(Topic, default, default);
            Result.DataReported(Topic, Content);
            return Result;
        }
    }
}