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LowpanBeaconInfo

public class LowpanBeaconInfo
extends Object

java.lang.Object
   ↳ com.google.android.things.lowpan.LowpanBeaconInfo


Describes a LoWPAN Beacon.

LowpanBeaconInfo objects are emitted by the LowpanScanner class when performing a network scan. They contain a LowpanIdentity object along with the originating hardware address, RSSI, and (if available) LQI of the received network beacon.

Summary

Constants

int FLAG_CAN_ASSIST

Indicates if the device which sent this beacon can assist with commissioning a device onto the LoWPAN.

Public methods

boolean equals(Object rhs)

Indicates whether some other object is "equal to" this one.

byte[] getBeaconAddress()

Returns a copy of the beacon address associated with this beacon.

Collection<Integer> getFlags()

Returns a collection of integers representing any flags associated with this beacon.

LowpanIdentity getLowpanIdentity()

Returns the LowpanIdentity object associated with this beacon.

int getLqi()

Returns the Link Quality Index (LQI) of the beacon.

int getRssi()

Returns the RSSI of the beacon, measured in dBm.

int hashCode()

Returns a hash code value for the object.

boolean isFlagSet(int flag)

Test for determining if a specific flag is set on this beacon.

String toString()

Returns a string representation of the object.

Inherited methods

From class java.lang.Object

Constants

FLAG_CAN_ASSIST

int FLAG_CAN_ASSIST

Indicates if the device which sent this beacon can assist with commissioning a device onto the LoWPAN.

Constant Value: 1 (0x00000001)

Public methods

equals

boolean equals (Object rhs)

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

  • It is reflexive: for any non-null reference value x, x.equals(x) should return true.
  • It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
  • It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
  • It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
  • For any non-null reference value x, x.equals(null) should return false.

The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).

Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.

Parameters
rhs Object: the reference object with which to compare.

Returns
boolean true if this object is the same as the obj argument; false otherwise.

getBeaconAddress

byte[] getBeaconAddress ()

Returns a copy of the beacon address associated with this beacon.

Returns
byte[]

getFlags

Collection<Integer> getFlags ()

Returns a collection of integers representing any flags associated with this beacon.

Returns
Collection<Integer>

getLowpanIdentity

LowpanIdentity getLowpanIdentity ()

Returns the LowpanIdentity object associated with this beacon.

Returns
LowpanIdentity

getLqi

int getLqi ()

Returns the Link Quality Index (LQI) of the beacon.

The returned value ranges between 0 and 255:

  • A value of 0 indicates that the LQI was not set.
  • A value of 1 indicates the worst possible quality where the decoded beacon is still valid.
  • A value of 255 indicates the best possible quality that can be recognized by the radio hardware.
  • Values 2-254 are intended to represent relative quality levels evenly distributed between the worst and best, with lower values always indicating a worse quality than higher values.

Returns
int

getRssi

int getRssi ()

Returns the RSSI of the beacon, measured in dBm.

Returns
int

hashCode

int hashCode ()

Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by HashMap.

The general contract of hashCode is:

  • Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
  • If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
  • It is not required that if two objects are unequal according to the equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java™ programming language.)

Returns
int a hash code value for this object.

isFlagSet

boolean isFlagSet (int flag)

Test for determining if a specific flag is set on this beacon.

Parameters
flag int

Returns
boolean

toString

String toString ()

Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

 getClass().getName() + '@' + Integer.toHexString(hashCode())
 

Returns
String a string representation of the object.