Support refresh command for signalStrength items. (openhab#11944)

Fixes openhab#11942

Signed-off-by: Jacob Laursen <jacob-github@vindvejr.dk>
Signed-off-by: Andras Uhrin <andras.uhrin@gmail.com>

bundles/org.openhab.binding.hdpowerview/README.md

@@ -166,6 +166,7 @@ For single shades the refresh takes the item's channel into consideration:
 | lowBattery     | Battery           |
 | batteryLevel   | Battery           |
 | batteryVoltage | Battery           |
+| signalStrength | Survey            |
 
 ## Full Example
 

bundles/org.openhab.binding.hdpowerview/src/main/java/org/openhab/binding/hdpowerview/internal/HDPowerViewWebTargets.java

@@ -33,6 +33,7 @@
 import org.openhab.binding.hdpowerview.internal.api.responses.ScheduledEvents;
 import org.openhab.binding.hdpowerview.internal.api.responses.Shade;
 import org.openhab.binding.hdpowerview.internal.api.responses.Shades;
+import org.openhab.binding.hdpowerview.internal.api.responses.Survey;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -46,7 +47,7 @@
  *
  * @author Andy Lintner - Initial contribution
  * @author Andrew Fiddian-Green - Added support for secondary rail positions
- * @author Jacob Laursen - Add support for scene groups and automations
+ * @author Jacob Laursen - Added support for scene groups and automations
  */
 @NonNullByDefault
 public class HDPowerViewWebTargets {
@@ -325,6 +326,25 @@ private synchronized String invoke(HttpMethod method, String url, @Nullable Quer
         return gson.fromJson(json, Shade.class);
     }
 
+    /**
+     * Instructs the hub to do a hard refresh (discovery on the hubs RF network) on
+     * a specific shade's survey data, which will also refresh signal strength;
+     * fetches a JSON package that describes that survey, and wraps it in a Survey
+     * class instance
+     *
+     * @param shadeId id of the shade to be surveyed
+     * @return Survey class instance
+     * @throws JsonParseException if there is a JSON parsing error
+     * @throws HubProcessingException if there is any processing error
+     * @throws HubMaintenanceException if the hub is down for maintenance
+     */
+    public @Nullable Survey getShadeSurvey(int shadeId)
+            throws JsonParseException, HubProcessingException, HubMaintenanceException {
+        String json = invoke(HttpMethod.GET, shades + Integer.toString(shadeId),
+                Query.of("survey", Boolean.toString(true)), null);
+        return gson.fromJson(json, Survey.class);
+    }
+
     /**
      * Instructs the hub to do a hard refresh (discovery on the hubs RF network) on
      * a specific shade's battery level; fetches a JSON package that describes that shade,

bundles/org.openhab.binding.hdpowerview/src/main/java/org/openhab/binding/hdpowerview/internal/api/responses/Survey.java

@@ -0,0 +1,51 @@
+/**
+ * Copyright (c) 2010-2021 Contributors to the openHAB project
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package org.openhab.binding.hdpowerview.internal.api.responses;
+
+import java.util.List;
+import java.util.StringJoiner;
+
+import com.google.gson.annotations.SerializedName;
+
+/**
+ * Survey data of a single Shade, as returned by an HD PowerView hub
+ *
+ * @author Jacob Laursen - Initial contribution
+ */
+public class Survey {
+    @SerializedName("shade_id")
+    public int shadeId;
+    @SerializedName("survey")
+    public List<SurveyData> surveyData;
+
+    public static class SurveyData {
+        @SerializedName("neighbor_id")
+        public int neighborId;
+        public int rssi;
+
+        @Override
+        public String toString() {
+            return String.format("{neighbor id:%d, rssi:%d}", neighborId, rssi);
+        }
+    }
+
+    @Override
+    public String toString() {
+        if (surveyData == null) {
+            return "{}";
+        }
+        StringJoiner joiner = new StringJoiner(", ");
+        surveyData.forEach(data -> joiner.add(data.toString()));
+        return joiner.toString();
+    }
+}

bundles/org.openhab.binding.hdpowerview/src/main/java/org/openhab/binding/hdpowerview/internal/handler/HDPowerViewShadeHandler.java

@@ -31,6 +31,7 @@
 import org.openhab.binding.hdpowerview.internal.api.ShadePosition;
 import org.openhab.binding.hdpowerview.internal.api.responses.Shade;
 import org.openhab.binding.hdpowerview.internal.api.responses.Shades.ShadeData;
+import org.openhab.binding.hdpowerview.internal.api.responses.Survey;
 import org.openhab.binding.hdpowerview.internal.config.HDPowerViewShadeConfiguration;
 import org.openhab.core.library.types.DecimalType;
 import org.openhab.core.library.types.OnOffType;
@@ -62,13 +63,15 @@ public class HDPowerViewShadeHandler extends AbstractHubbedThingHandler {
 
     private enum RefreshKind {
         POSITION,
+        SURVEY,
         BATTERY_LEVEL
     }
 
     private final Logger logger = LoggerFactory.getLogger(HDPowerViewShadeHandler.class);
 
     private static final int REFRESH_DELAY_SEC = 10;
     private @Nullable ScheduledFuture<?> refreshPositionFuture = null;
+    private @Nullable ScheduledFuture<?> refreshSignalFuture = null;
     private @Nullable ScheduledFuture<?> refreshBatteryLevelFuture = null;
 
     public HDPowerViewShadeHandler(Thing thing) {
@@ -118,6 +121,9 @@ public void handleCommand(ChannelUID channelUID, Command command) {
                 case CHANNEL_SHADE_BATTERY_VOLTAGE:
                     requestRefreshShadeBatteryLevel();
                     break;
+                case CHANNEL_SHADE_SIGNAL_STRENGTH:
+                    requestRefreshShadeSurvey();
+                    break;
             }
             return;
         }
@@ -300,6 +306,15 @@ protected synchronized void requestRefreshShadePosition() {
         }
     }
 
+    /**
+     * Request that the shade shall undergo a 'hard' refresh for querying its survey data
+     */
+    protected synchronized void requestRefreshShadeSurvey() {
+        if (refreshSignalFuture == null) {
+            refreshSignalFuture = scheduler.schedule(this::doRefreshShadeSignal, REFRESH_DELAY_SEC, TimeUnit.SECONDS);
+        }
+    }
+
     /**
      * Request that the shade shall undergo a 'hard' refresh for querying its battery level state
      */
@@ -315,6 +330,11 @@ private void doRefreshShadePosition() {
         refreshPositionFuture = null;
     }
 
+    private void doRefreshShadeSignal() {
+        this.doRefreshShade(RefreshKind.SURVEY);
+        refreshSignalFuture = null;
+    }
+
     private void doRefreshShadeBatteryLevel() {
         this.doRefreshShade(RefreshKind.BATTERY_LEVEL);
         refreshBatteryLevelFuture = null;
@@ -336,6 +356,14 @@ private void doRefreshShade(RefreshKind kind) {
                 case POSITION:
                     shade = webTargets.refreshShadePosition(shadeId);
                     break;
+                case SURVEY:
+                    Survey survey = webTargets.getShadeSurvey(shadeId);
+                    if (survey != null && survey.surveyData != null) {
+                        logger.debug("Survey response for shade {}: {}", survey.shadeId, survey.toString());
+                    } else {
+                        logger.warn("No response from shade {} survey", shadeId);
+                    }
+                    return;
                 case BATTERY_LEVEL:
                     shade = webTargets.refreshShadeBatteryLevel(shadeId);
                     break;