WebSocket DAT

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The WebSocket DAT receives and parses WebSocket messages. WebSockets are fast an efficient two way communication protocol used by web servers and clients. Each message is parsed and appended as a row in the DAT's table. The table is FIFO "first-in first-out" and limited to parameter-set number of lines. An optional script may be run for each packet received. The WebSocket DAT also supports the Socket.IO up to version 0.9.16 handshake protocol. Secure (tls) websocket servers are also supported. Connections to different websocket sites are supported without requiring manual header setup.

See also: TCP/IP DAT

Example project: chat with WebSockets


WebSocket DAT on Old Wiki

Parameters - Connect Page

Active active - While on, the DAT receives information sent to the network port. While Off, no updating occurs. Data sent to the port is lost.

Network Address netaddress - The network address of the server computer. This address is a standard WWW address, such as foo or foo.bar.com. You can put an IP address (e.g. If you put localhost, it means the other end of the connection is on the same computer.

Network Port port - The port in which the DAT will accept messages.

Socket.io Format (0.9.16) socketio - When on, a Socket.io handshake is negotiated after the WebSocket handshake. Messages will continue as normal, plus Socket.IO heartbeats, timeouts and disconnection support are additionally available, which are useful for realtime applications.

Socket.io Address socketioaddress - Can be used to define initial socket.io header requests.

Parameters - Received Messages Page

Callbacks DAT callbacks - The Callbacks DAT will execute once for each message coming in.

Execute from executeloc - - Determines the location the script is run from.

  • Current Node current - The script is executed from the current node location.
  • Callbacks DAT callbacks - The script is executed from the location of the DAT specified in the Callbacks DAT parameter.
  • Specified Operator op - The script is executed from the operator specified in the From Operator parameter below.

From Operator fromop - The operator whose state change will trigger the DAT to execute its script when Execute from is set to Specified Operator. This operator is also the path that the script will be executed from if the Execute from parameter is set to Specified Operator.

Clamp Output clamp - The DAT is limited to 100 messages by default but with Clamp Output, this can be set to anything including unlimited.

Maximum Lines maxlines - Limits the number of messages, older messages are removed from the list first.

Clear Output clear - Deletes all lines except the heading. To clear with a python script op("opname").par.clear.pulse()

Bytes Column bytes - Outputs the raw bytes of the message in a separate column.

Parameters - Common Page

Language language - - Select how the DAT decides which script language to operate on.

  • Input input - The DAT uses the inputs script language.
  • Node node - The DAT uses it's own script language.

Edit/View Extension extension - - Select the file extension this DAT should expose to external editors.

  • dat dat - various common file extensions.
  • From Language language - pick extension from DATs script language.
  • Custom Extension custom - Specify a custom extension.

Custom Extension customext - Specifiy the custom extension.

Word Wrap wordwrap - - Enable Word Wrap for Node Display.

  • Input input - The DAT uses the inputs setting.
  • On on - Turn on Word Wrap.
  • Off off - Turn off Word Wrap.

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