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   1 /**
   2  * Copyright (c) 2010-2023 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.homematic.internal.communicator.virtual;
  14
  15 import static org.openhab.binding.homematic.internal.misc.HomematicConstants.VIRTUAL_DATAPOINT_NAME_SIGNAL_STRENGTH;
  16
  17 import org.openhab.binding.homematic.internal.model.HmChannel;
  18 import org.openhab.binding.homematic.internal.model.HmDatapoint;
  19 import org.openhab.binding.homematic.internal.model.HmDevice;
  20 import org.openhab.binding.homematic.internal.model.HmValueType;
  21
  22 /**
  23  * A virtual datapoint that represents signal strength of a device as a number with values 0, 1, 2, 3 or 4, 0 being
  24  * worst strength and 4 being best strength.
  25  *
  26  * @author Gerhard Riegler - Initial contribution
  27  */
  28
  29 public class SignalStrengthVirtualDatapointHandler extends RssiVirtualDatapointHandler {
  30     private static final int RSSI_START = 40;
  31     private static final int RSSI_STEP = 25;
  32     private static final int RSSI_UNITS = 4;
  33
  34     @Override
  35     public String getName() {
  36         return VIRTUAL_DATAPOINT_NAME_SIGNAL_STRENGTH;
  37     }
  38
  39     @Override
  40     public void initialize(HmDevice device) {
  41         if (isWirelessDevice(device)) {
  42             addDatapoint(device, 0, getName(), HmValueType.INTEGER, getRssiValue(device.getChannel(0)), true);
  43         }
  44     }
  45
  46     @Override
  47     public void handleEvent(VirtualGateway gateway, HmDatapoint dp) {
  48         HmChannel channel = dp.getChannel();
  49         Integer value = getRssiValue(channel);
  50
  51         if (value != null) {
  52             Integer strength = Math.max(Math.abs(value), RSSI_START);
  53             strength = strength > RSSI_START + RSSI_STEP * RSSI_UNITS ? 0
  54                     : RSSI_UNITS - ((strength - RSSI_START) / RSSI_STEP);
  55
  56             HmDatapoint vdpRssi = getVirtualDatapoint(channel);
  57             vdpRssi.setValue(strength);
  58         }
  59     }
  60 }