Fix setLightParms() dispatch for Gen2 RGBW PM; fix brightness=0 not turning off

- setLightParms() was missing return after RGBW.Set, throwing for all
  callers; now dispatches: rgbw->RGBW.Set, inColor->RGB.Set,
  cctx2->CCT.Set, light->Light.Set
- Add ct field to Shelly2RpcRequestParams for CCT.Set
- Skip brightness=0 in Gen2 params; on=false handles turn-off (#18215)

Signed-off-by: Markus Michels <markus7017@gmail.com>

Author: markus7017

bundles/org.openhab.binding.shelly/src/main/java/org/openhab/binding/shelly/internal/api2/Shelly2ApiJsonDTO.java

@@ -1108,6 +1108,7 @@ public static class Shelly2RpcRequestParams {
 
             // Dimmer / Light
             public Integer brightness;
+            public Integer ct; // color temperature in Kelvin (CCT.Set)
             @SerializedName("toggle_after")
             public Integer toggleAfter;
             public Integer white;

bundles/org.openhab.binding.shelly/src/main/java/org/openhab/binding/shelly/internal/api2/Shelly2ApiRpc.java

@@ -1031,12 +1031,24 @@ public void setLightParm(int lightIndex, String parm, String value) throws Shell
 
     @Override
     public void setLightParms(int lightIndex, Map<String, String> parameters) throws ShellyApiException {
+        ShellyDeviceProfile profile = getProfile();
         Shelly2RpcRequestParams params = new Shelly2RpcRequestParams();
-        if (getProfile().isRGBW2) {
-            String brightness = parameters.get(SHELLY_COLOR_BRIGHTNESS);
-            if (brightness != null) {
-                params.brightness = Integer.parseInt(brightness);
+        params.id = lightIndex;
+
+        if (parameters.containsKey(SHELLY_LIGHT_TURN)) {
+            params.on = SHELLY_API_ON.equals(parameters.get(SHELLY_LIGHT_TURN));
+        }
+        // Gen2 firmware rejects brightness=0; on=false handles turn-off
+        String brightnessStr = parameters.get(SHELLY_COLOR_BRIGHTNESS);
+        if (brightnessStr != null) {
+            int b = Integer.parseInt(brightnessStr);
+            if (b > 0) {
+                params.brightness = b;
             }
+        }
+
+        String rawProfile = getString(profile.device.profile);
+        if (SHELLY2_PROFILE_RGBW.equals(rawProfile)) {
             String red = parameters.get(SHELLY_COLOR_RED);
             String green = parameters.get(SHELLY_COLOR_GREEN);
             String blue = parameters.get(SHELLY_COLOR_BLUE);
@@ -1047,14 +1059,24 @@ public void setLightParms(int lightIndex, Map<String, String> parameters) throws
             if (white != null) {
                 params.white = Integer.parseInt(white);
             }
-            if (parameters.containsKey(SHELLY_LIGHT_TURN)) {
-                params.on = SHELLY_API_ON.equals(parameters.get(SHELLY_LIGHT_TURN));
-            }
-            params.id = lightIndex;
-
             apiRequest(SHELLYRPC_METHOD_RGBW_SET, params, String.class);
+        } else if (profile.inColor) {
+            String red = parameters.get(SHELLY_COLOR_RED);
+            String green = parameters.get(SHELLY_COLOR_GREEN);
+            String blue = parameters.get(SHELLY_COLOR_BLUE);
+            if (red != null && green != null && blue != null) {
+                params.rgb = new Integer[] { Integer.parseInt(red), Integer.parseInt(green), Integer.parseInt(blue) };
+            }
+            apiRequest(SHELLYRPC_METHOD_RGB_SET, params, String.class);
+        } else if (SHELLY2_PROFILE_CCTX2.equals(rawProfile)) {
+            String ct = parameters.get(SHELLY_COLOR_TEMP);
+            if (ct != null) {
+                params.ct = Integer.parseInt(ct);
+            }
+            apiRequest(SHELLYRPC_METHOD_CCT_SET, params, String.class);
+        } else {
+            apiRequest(SHELLYRPC_METHOD_LIGHT_SET, params, String.class);
         }
-        throw new ShellyApiException("API call not implemented");
     }
 
     @Override