chrome.sockets.udp

This API is part of the deprecated Chrome Apps platform. Learn more about migrating your app.

Description
Use the chrome.sockets.udp API to send and receive data over the network using UDP connections. This API supersedes the UDP functionality previously found in the "socket" API.
Manifest Keys
The following keys must be declared in the manifest to use this API.
sockets

Summary

Types
CreateInfo
ReceiveErrorInfo
ReceiveInfo
SendInfo
SocketInfo
SocketProperties
Methods
bind
close
create
getInfo
getJoinedGroups
getSockets
joinGroup
leaveGroup
send
setBroadcast
setMulticastLoopbackMode
setMulticastTimeToLive
setPaused
update
Events
onReceive
onReceiveError

Types

CreateInfo

Properties

socketId
number
The ID of the newly created socket. Note that socket IDs created from this API are not compatible with socket IDs created from other APIs, such as the deprecated [socket](../socket/) API.

ReceiveErrorInfo

Properties

resultCode
number
The result code returned from the underlying recvfrom() call.
socketId
number
The socket ID.

ReceiveInfo

Properties

data
ArrayBuffer
The UDP packet content (truncated to the current buffer size).
remoteAddress
string
The address of the host the packet comes from.
remotePort
number
The port of the host the packet comes from.
socketId
number
The socket ID.

SendInfo

Properties

bytesSent
number optional
The number of bytes sent (if result == 0)
resultCode
number
The result code returned from the underlying network call. A negative value indicates an error.

SocketInfo

Properties

bufferSize
number optional
The size of the buffer used to receive data. If no buffer size has been specified explictly, the value is not provided.
localAddress
string optional
If the underlying socket is bound, contains its local IPv4/6 address.
localPort
number optional
If the underlying socket is bound, contains its local port.
name
string optional
Application-defined string associated with the socket.
paused
boolean
Flag indicating whether the socket is blocked from firing onReceive events.
persistent
boolean
Flag indicating whether the socket is left open when the application is suspended (see SocketProperties.persistent).
socketId
number
The socket identifier.

SocketProperties

Properties

bufferSize
number optional
The size of the buffer used to receive data. If the buffer is too small to receive the UDP packet, data is lost. The default value is 4096.
name
string optional
An application-defined string associated with the socket.
persistent
boolean optional
Flag indicating if the socket is left open when the event page of the application is unloaded (see Manage App Lifecycle). The default value is "false." When the application is loaded, any sockets previously opened with persistent=true can be fetched with getSockets.

Methods

bind

chrome.sockets.udp.bind(
  socketId: number,
  address: string,
  port: number,
  callback: function,
)

Binds the local address and port for the socket. For a client socket, it is recommended to use port 0 to let the platform pick a free port.

Once the bind operation completes successfully, onReceive events are raised when UDP packets arrive on the address/port specified -- unless the socket is paused.

Parameters

socketId
number
The socket ID.
address
string
The address of the local machine. DNS name, IPv4 and IPv6 formats are supported. Use "0.0.0.0" to accept packets from all local available network interfaces.
port
number
The port of the local machine. Use "0" to bind to a free port.
callback
function
The callback parameter looks like: (result: number) => void
- result
  number
  The result code returned from the underlying network call. A negative value indicates an error.

close

chrome.sockets.udp.close(
  socketId: number,
  callback?: function,
)

Closes the socket and releases the address/port the socket is bound to. Each socket created should be closed after use. The socket id is no longer valid as soon at the function is called. However, the socket is guaranteed to be closed only when the callback is invoked.

Parameters

socketId
number
The socket ID.
callback
function optional
The callback parameter looks like: () => void

create

chrome.sockets.udp.create(
  properties: SocketProperties,
  callback: function,
)

Creates a UDP socket with the given properties.

Parameters

properties
SocketProperties
The socket properties (optional).
callback
function
The callback parameter looks like: (createInfo: CreateInfo) => void
- createInfo
  CreateInfo
  The result of the socket creation.

getInfo

chrome.sockets.udp.getInfo(
  socketId: number,
  callback: function,
)

Retrieves the state of the given socket.

Parameters

socketId
number
The socket ID.
callback
function
The callback parameter looks like: (socketInfo: SocketInfo) => void
- socketInfo
  SocketInfo
  Object containing the socket information.

getJoinedGroups

chrome.sockets.udp.getJoinedGroups(
  socketId: number,
  callback: function,
)

Gets the multicast group addresses the socket is currently joined to.

Parameters

socketId
number
The socket ID.
callback
function
The callback parameter looks like: (groups: string[]) => void
- groups
  string[]
  Array of groups the socket joined.

getSockets

chrome.sockets.udp.getSockets(
  callback: function,
)

Retrieves the list of currently opened sockets owned by the application.

Parameters

callback
function
The callback parameter looks like: (socketInfos: SocketInfo[]) => void
- socketInfos
  SocketInfo[]
  Array of object containing socket information.

joinGroup

chrome.sockets.udp.joinGroup(
  socketId: number,
  address: string,
  callback: function,
)

Joins the multicast group and starts to receive packets from that group. The socket must be bound to a local port before calling this method.

Parameters

socketId
number
The socket ID.
address
string
The group address to join. Domain names are not supported.
callback
function
The callback parameter looks like: (result: number) => void
- result
  number
  The result code returned from the underlying network call. A negative value indicates an error.

leaveGroup

chrome.sockets.udp.leaveGroup(
  socketId: number,
  address: string,
  callback: function,
)

Leaves the multicast group previously joined using joinGroup. This is only necessary to call if you plan to keep using the socketafterwards, since it will be done automatically by the OS when the socket is closed.

Leaving the group will prevent the router from sending multicast datagrams to the local host, presuming no other process on the host is still joined to the group.

Parameters

socketId
number
The socket ID.
address
string
The group address to leave. Domain names are not supported.
callback
function
The callback parameter looks like: (result: number) => void
- result
  number
  The result code returned from the underlying network call. A negative value indicates an error.

send

chrome.sockets.udp.send(
  socketId: number,
  data: ArrayBuffer,
  address: string,
  port: number,
  callback: function,
)

Sends data on the given socket to the given address and port. The socket must be bound to a local port before calling this method.

Parameters

socketId
number
The socket ID.
data
ArrayBuffer
The data to send.
address
string
The address of the remote machine.
port
number
The port of the remote machine.
callback
function
The callback parameter looks like: (sendInfo: SendInfo) => void
- sendInfo
  SendInfo
  Result of the send method.

setBroadcast

chrome.sockets.udp.setBroadcast(
  socketId: number,
  enabled: boolean,
  callback: function,
)

Chrome 44+

Enables or disables broadcast packets on this socket.

Parameters

socketId
number
The socket ID.
enabled
boolean
true to enable broadcast packets, false to disable them.
callback
function
The callback parameter looks like: (result: number) => void
- result
  number
  The result code returned from the underlying network call.

setMulticastLoopbackMode

chrome.sockets.udp.setMulticastLoopbackMode(
  socketId: number,
  enabled: boolean,
  callback: function,
)

Sets whether multicast packets sent from the host to the multicast group will be looped back to the host.

Note: the behavior of setMulticastLoopbackMode is slightly different between Windows and Unix-like systems. The inconsistency happens only when there is more than one application on the same host joined to the same multicast group while having different settings on multicast loopback mode. On Windows, the applications with loopback off will not RECEIVE the loopback packets; while on Unix-like systems, the applications with loopback off will not SEND the loopback packets to other applications on the same host. See MSDN: http://goo.gl/6vqbj

Calling this method does not require multicast permissions.

Parameters

socketId
number
The socket ID.
enabled
boolean
Indicate whether to enable loopback mode.
callback
function
The callback parameter looks like: (result: number) => void
- result
  number
  The result code returned from the underlying network call. A negative value indicates an error.

setMulticastTimeToLive

chrome.sockets.udp.setMulticastTimeToLive(
  socketId: number,
  ttl: number,
  callback: function,
)

Sets the time-to-live of multicast packets sent to the multicast group.

Calling this method does not require multicast permissions.

Parameters

socketId
number
The socket ID.
ttl
number
The time-to-live value.
callback
function
The callback parameter looks like: (result: number) => void
- result
  number
  The result code returned from the underlying network call. A negative value indicates an error.

setPaused

chrome.sockets.udp.setPaused(
  socketId: number,
  paused: boolean,
  callback?: function,
)

Pauses or unpauses a socket. A paused socket is blocked from firing onReceive events.

Parameters

socketId
number
paused
boolean
Flag to indicate whether to pause or unpause.
callback
function optional
The callback parameter looks like: () => void

update

chrome.sockets.udp.update(
  socketId: number,
  properties: SocketProperties,
  callback?: function,
)

Updates the socket properties.

Parameters

socketId
number
The socket ID.
properties
SocketProperties
The properties to update.
callback
function optional
The callback parameter looks like: () => void

Events

onReceive

chrome.sockets.udp.onReceive.addListener(
  callback: function,
)

Event raised when a UDP packet has been received for the given socket.

Parameters

callback
function
The callback parameter looks like: (info: ReceiveInfo) => void
- info
  ReceiveInfo

onReceiveError

chrome.sockets.udp.onReceiveError.addListener(
  callback: function,
)

Event raised when a network error occured while the runtime was waiting for data on the socket address and port. Once this event is raised, the socket is paused and no more onReceive events will be raised for this socket until the socket is resumed.

Parameters

callback
function
The callback parameter looks like: (info: ReceiveErrorInfo) => void
- info
  ReceiveErrorInfo