com.digi.xbee.api.packet.raw.RX64Packet Maven / Gradle / Ivy
/**
* Copyright 2017, Digi International Inc.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at http://mozilla.org/MPL/2.0/.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package com.digi.xbee.api.packet.raw;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;
import java.util.LinkedHashMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.digi.xbee.api.models.XBee64BitAddress;
import com.digi.xbee.api.packet.XBeeAPIPacket;
import com.digi.xbee.api.packet.APIFrameType;
import com.digi.xbee.api.utils.ByteUtils;
import com.digi.xbee.api.utils.HexUtils;
/**
* This class represents an RX (Receive) 64 Request packet. Packet is built
* using the parameters of the constructor or providing a valid API payload.
*
* When the module receives an RF packet, it is sent out the UART using
* this message type.
*
* This packet is the response to TX (transmit) 64 Request packets.
*
* @see TX64Packet
* @see com.digi.xbee.api.packet.XBeeAPIPacket
*
*/
public class RX64Packet extends XBeeAPIPacket {
// Constants.
private static final int MIN_API_PAYLOAD_LENGTH = 11; // 1 (Frame type) + 8 (64-bit address) + 1 (signal strength) + 1 (receive options)
// Variables.
private final XBee64BitAddress sourceAddress64;
private final int rssi;
private final int receiveOptions;
private byte[] rfData;
private Logger logger;
/**
* Creates a new {@code RX64Packet} object from the given payload.
*
* @param payload The API frame payload. It must start with the frame type
* corresponding to a RX64 packet ({@code 0x80}).
* The byte array must be in {@code OperatingMode.API} mode.
*
* @return Parsed RX 64 packet.
*
* @throws IllegalArgumentException if {@code payload[0] != APIFrameType.RX_64.getValue()} or
* if {@code payload.length < }{@value #MIN_API_PAYLOAD_LENGTH} or
* if {@code rssi < 0} or
* if {@code rssi > 100} or
* if {@code receiveOptions < 0} or
* if {@code receiveOptions > 255}.
* @throws NullPointerException if {@code payload == null}.
*/
public static RX64Packet createPacket(byte[] payload) {
if (payload == null)
throw new NullPointerException("RX64 packet payload cannot be null.");
// 1 (Frame type) + 8 (64-bit address) + 1 (signal strength) + 1 (receive options)
if (payload.length < MIN_API_PAYLOAD_LENGTH)
throw new IllegalArgumentException("Incomplete RX64 packet.");
if ((payload[0] & 0xFF) != APIFrameType.RX_64.getValue())
throw new IllegalArgumentException("Payload is not a RX64 packet.");
// payload[0] is the frame type.
int index = 1;
// 8 bytes of 64-bit address.
XBee64BitAddress sourceAddress64 = new XBee64BitAddress(Arrays.copyOfRange(payload, index, index + 8));
index = index + 8;
// Signal strength byte.
int signalStrength = payload[index] & 0xFF;
index = index + 1;
// Receive options byte.
int receiveOptions = payload[index] & 0xFF;
index = index + 1;
// Get data.
byte[] data = null;
if (index < payload.length)
data = Arrays.copyOfRange(payload, index, payload.length);
return new RX64Packet(sourceAddress64, signalStrength, receiveOptions, data);
}
/**
* Class constructor. Instantiates a new {@code RX64Packet} object with
* the given parameters.
*
* @param sourceAddress64 64-bit address of the sender.
* @param rssi Received signal strength indicator.
* @param receiveOptions Bitfield indicating the receive options.
* @param rfData Received RF data.
*
* @throws IllegalArgumentException if {@code rssi < 0} or
* if {@code rssi > 100} or
* if {@code receiveOptions < 0} or
* if {@code receiveOptions > 255}.
* @throws NullPointerException if {@code sourceAddress64 == null}.
*
* @see com.digi.xbee.api.models.XBeeReceiveOptions
* @see com.digi.xbee.api.models.XBee64BitAddress
*/
public RX64Packet(XBee64BitAddress sourceAddress64, int rssi, int receiveOptions, byte[] rfData) {
super(APIFrameType.RX_64);
if (sourceAddress64 == null)
throw new NullPointerException("64-bit source address cannot be null.");
if (rssi < 0 || rssi > 100)
throw new IllegalArgumentException("RSSI value must be between 0 and 100.");
if (receiveOptions < 0 || receiveOptions > 255)
throw new IllegalArgumentException("Receive options value must be between 0 and 255.");
this.sourceAddress64 = sourceAddress64;
this.rssi = rssi;
this.receiveOptions = receiveOptions;
this.rfData = rfData;
this.logger = LoggerFactory.getLogger(RX64Packet.class);
}
/*
* (non-Javadoc)
* @see com.digi.xbee.api.packet.XBeeAPIPacket#getAPIPacketSpecificData()
*/
@Override
protected byte[] getAPIPacketSpecificData() {
ByteArrayOutputStream os = new ByteArrayOutputStream();
try {
os.write(sourceAddress64.getValue());
os.write(rssi);
os.write(receiveOptions);
if (rfData != null)
os.write(rfData);
} catch (IOException e) {
logger.error(e.getMessage(), e);
}
return os.toByteArray();
}
/*
* (non-Javadoc)
* @see com.digi.xbee.api.packet.XBeeAPIPacket#needsAPIFrameID()
*/
@Override
public boolean needsAPIFrameID() {
return false;
}
/*
* (non-Javadoc)
* @see com.digi.xbee.api.packet.XBeeAPIPacket#isBroadcast()
*/
@Override
public boolean isBroadcast() {
return ByteUtils.isBitEnabled(getReceiveOptions(), 1)
|| ByteUtils.isBitEnabled(getReceiveOptions(), 2);
}
/**
* Returns the 64-bit sender/source address.
*
* @return The 64-bit sender/source address.
*
* @see com.digi.xbee.api.models.XBee64BitAddress
*/
public XBee64BitAddress get64bitSourceAddress() {
return sourceAddress64;
}
/**
* Returns the Received Signal Strength Indicator (RSSI).
*
* @return The Received Signal Strength Indicator (RSSI).
*/
public int getRSSI() {
return rssi;
}
/**
* Returns the receive options bitfield.
*
* @return Receive options bitfield.
*
* @see com.digi.xbee.api.models.XBeeReceiveOptions
*/
public int getReceiveOptions() {
return receiveOptions;
}
/**
* Sets the received RF data.
*
* @param rfData Received RF data.
*/
public void setRFData(byte[] rfData) {
if (rfData == null)
this.rfData = null;
else
this.rfData = Arrays.copyOf(rfData, rfData.length);
}
/**
* Returns the received RF data.
*
* @return Received RF data.
*/
public byte[] getRFData() {
if (rfData == null)
return null;
return Arrays.copyOf(rfData, rfData.length);
}
/*
* (non-Javadoc)
* @see com.digi.xbee.api.packet.XBeeAPIPacket#getAPIPacketParameters()
*/
@Override
public LinkedHashMap getAPIPacketParameters() {
LinkedHashMap parameters = new LinkedHashMap();
parameters.put("64-bit source address", HexUtils.prettyHexString(sourceAddress64.toString()));
parameters.put("RSSI", HexUtils.prettyHexString(HexUtils.integerToHexString(rssi, 1)));
parameters.put("Options", HexUtils.prettyHexString(HexUtils.integerToHexString(receiveOptions, 1)));
if (rfData != null)
parameters.put("RF data", HexUtils.prettyHexString(HexUtils.byteArrayToHexString(rfData)));
return parameters;
}
}
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