Weighing: Differentiate between scale and terminal

Elwig/Helpers/Weighing/SysTecITScale.cs

@@ -8,15 +8,14 @@ namespace Elwig.Helpers.Weighing {
     public class SysTecITScale : Scale, ICommandScale {
 
         public string Manufacturer => "SysTec";
-        public int InternalScaleNr => 1;
         public string Model { get; private set; }
-        public string ScaleId { get; private set; }
+        public string ScaleTerminalId { get; private set; }
         public bool IsReady { get; private set; }
         public bool HasFillingClearance { get; private set; }
 
         public SysTecITScale(string id, string model, string cnx, string? empty = null, string? filling = null, int? limit = null, string? log = null) :
             base(cnx, empty, filling, limit, log) {
-            ScaleId = id;
+            ScaleTerminalId = id;
             Model = model;
             IsReady = true;
             HasFillingClearance = false;
@@ -74,15 +73,15 @@ namespace Elwig.Helpers.Weighing {
             return line[1..^3];
         }
 
-        protected async Task<WeighingResult> Weigh(bool incIdentNr, bool retry = true) {
+        protected async Task<WeighingResult> Weigh(int internalScalNr, bool incIdentNr, bool retry = true) {
             string record;
             try {
-                await SendCommand(incIdentNr ? $"RN{InternalScaleNr}" : $"RM{InternalScaleNr}");
+                await SendCommand(incIdentNr ? $"RN{internalScalNr}" : $"RM{internalScalNr}");
                 record = await ReceiveResponse();
             } catch (IOException) {
                 if (!retry || Tcp == null) throw;
                 ReconnectTcp();
-                return await Weigh(incIdentNr, false);
+                return await Weigh(internalScalNr, incIdentNr, false);
             }
             if (record.Length != 62)
                 throw new FormatException("Invalid response from scale: Received record has invalid size");
@@ -114,6 +113,7 @@ namespace Elwig.Helpers.Weighing {
                 GrossWeight = int.Parse(brutto),
                 TareWeight = int.Parse(tara),
                 NetWeight = int.Parse(netto),
+                ScaleId = scaleNr,
                 WeighingId = identNr,
                 FullWeighingId = identNr != null ? $"{parsedDate:yyyy-MM-dd}/{identNr}" : null,
                 Date = parsedDate,
@@ -121,12 +121,12 @@ namespace Elwig.Helpers.Weighing {
             };
         }
 
-        public async Task<WeighingResult> Weigh() {
-            return await Weigh(true);
+        public async Task<WeighingResult> Weigh(int? scaleNr = 1) {
+            return await Weigh(scaleNr ?? 1, true);
         }
 
-        public async Task<WeighingResult> GetCurrentWeight() {
-            return await Weigh(false);
+        public async Task<WeighingResult> GetCurrentWeight(int? scaleNr = 1) {
+            return await Weigh(scaleNr ?? 1, false);
         }
 
         public async Task Empty() {