Auto: abcip-3.1 — configurable CIP connection size per device

Closes #235

src/ZB.MOM.WW.OtOpcUa.Driver.AbCip/AbCipConnectionSize.cs

@@ -0,0 +1,29 @@
+namespace ZB.MOM.WW.OtOpcUa.Driver.AbCip;
+
+/// <summary>
+///     PR abcip-3.1 — bounds + magic numbers for the per-device CIP <c>ConnectionSize</c>
+///     override. Pulled into a single place so config validation, the legacy-firmware warning,
+///     and the docs stay in sync.
+/// </summary>
+public static class AbCipConnectionSize
+{
+    /// <summary>
+    ///     Minimum supported CIP Forward Open buffer size, in bytes. Matches the lower bound of
+    ///     Kepware's connection-size slider for ControlLogix drivers + the libplctag native
+    ///     floor that still leaves headroom for the CIP MR header.
+    /// </summary>
+    public const int Min = 500;
+
+    /// <summary>
+    ///     Maximum supported CIP Forward Open buffer size, in bytes. Matches the upper bound of
+    ///     Kepware's slider + the Large Forward Open ceiling on FW20+ ControlLogix.
+    /// </summary>
+    public const int Max = 4002;
+
+    /// <summary>
+    ///     Soft cap above which legacy ControlLogix firmware (v19 and earlier) rejects the
+    ///     Forward Open. CompactLogix L1/L2/L3 narrow-cap parts (5069-L1/L2/L3) and Micro800
+    ///     hard-cap below this too. Used as the threshold for the legacy-firmware warning.
+    /// </summary>
+    public const int LegacyFirmwareCap = 511;
+}