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    TCP Communication

    Last updated: 2024-11-21 18:41:53
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      createTCPSocket

      This API is used via TCPSocket?wx.createTCPSocket().
      Feature description: Creates a TCP Socket instance.
      Return Value: A TCP Socket instance.
      Link limitations
      Allows communication with non-local IP within the local area network.
      Allows communication with configured server domain names.
      Prohibits connections to the following port numbers: below 1024, 1099, 1433, 1521, 1719, 1720, 1723, 2049, 2375, 3128, 3306, 3389, 3659, 4045, 5060, 5061, 5432, 5984, 6379, 6000, 6566, 7001, 7002, 8000-8100, 8443, 8888, 9200, 9300, 10051, 10080, 11211, 27017, 27018, 27019.
      A maximum of 20 TCPSockets can be created within every 5-minute interval.

      TCPSocket

      Note:
      A TCP Socket instance, using IPv4 protocol by default.
      When errCode is -2, the corresponding errno should be present in errMsg. Developers can examine the specific error message in the Linux code's errno-base.h and errno.h based on the errno.

      .bindWifi

      This method is used via TCPSocket.bindWifi(Object options).
      Feature Description: Binds the TCP Socket to the current Wi-Fi network, which will, upon successful execution, trigger the onBindWifi event (supported only on Android).
      Parameter and Description: Object options.
      Attribute
      Type
      Default value
      Required
      Note
      BSSID
      string
      -
      Yes
      The BSSID of the current Wi-Fi network, which can be obtained through wx.getConnectedWifi.
      Sample Code
      const tcp = wx.createTCPSocket()  
      tcp.bindWifi({ BSSID: 'xxx' })  
      tcp.onBindWifi(() => {})

      .close

      This method is used via TCPSocket.close().
      Feature Description: Disables connection.
      Sample Code
      const tcp = wx.createTCPSocket()  
      tcp.close()

      .connect

      This method is used via TCPSocket.connect(Object options).
      Feature Description: Initiates a connection on the specified socket.
      Parameter and Description: Object options.
      Attribute
      Type
      Default value
      Required
      Note
      address
      string
      -
      Yes
      The address to which the socket is to be connected.
      Port No.
      number
      -
      Yes
      The port to which the socket is to be connected.
      timeout
      number
      2
      No
      The timeout duration for the socket connection, defaulting to 2 seconds.
      Sample Code
      const tcp = wx.createTCPSocket()  
      tcp.connect({address: '192.168.193.2', port: 8848})

      .onClose

      This method is used via TCPSocket.onClose(function listener).
      Feature Description: Monitors events that are emitted once the socket is fully closed.
      Parameter and Description: function listener, the listener function for events triggered once the socket is fully closed.

      .offClose

      This method is used via TCPSocket.offClose(function listener).
      Feature Description: Removes the listener function for events that are emitted once the socket is fully closed.
      Parameter and Description: function listener, the listener function passed in by onClose. If this parameter is not passed in, all listener functions will be removed.
      Sample Code
      const listener = function (res) { console.log(res) }
      
      TCPSocket.onConnect(listener)
      TCPSocket.offConnect(listener) // The same function object as the listener must be passed in.

      .onConnect

      This method is used via TCPSocket.onConnect(function listener).
      Feature Description: Monitors events that are triggered when a socket connection is successfully established.
      Parameter and Description: function listener, the listener function for events triggered when a socket connection is successfully established.

      .offConnect

      This method is used via TCPSocket.offConnect(function listener).
      Feature Description: Removes the listener function for events triggered when a socket connection is successfully established.
      Parameter and Description: function listener, the listener function passed in by onConnect. If this parameter is not passed in, all listener functions will be removed.
      Sample Code
      const listener = function (res) { console.log(res) }
      
      TCPSocket.onConnect(listener)
      TCPSocket.offConnect(listener) // The same function object as the listener must be passed in.

      .onError

      This method is used via TCPSocket.onError(function listener).
      Feature Description: Monitoring is triggered when an error occurs.
      Parameters and Description: The listener function of function listener.
      Attribute
      Type
      Note
      errMsg
      string
      Error Message

      .offError

      This method is used via TCPSocket.offError(function listener).
      Feature Description: Removes the listener function that is triggered when an error occurs.
      Parameter and Description: function listener, the listener function passed in by onError. If this parameter is not passed in, all listener functions will be removed.
      Sample Code
      const listener = function (res) { console.log(res) }
      
      TCPSocket.onError(listener)
      TCPSocket.offError(listener) // The same function object as the listener must be passed in.

      .onMessage

      This method is used via TCPSocket.onMessage(function listener).
      Feature Description: Monitors events that are triggered when data is received.
      Parameter and Description: function listener, when receiving data to trigger the event of the listener function, the parameter Object res as follows:
      Attribute
      Type
      Note
      message
      ArrayBufffer
      Received message
      remoteInfo
      Object
      Sender's address information
      localInfo
      Object
      Recipient's address information
      Structure attributes of "remoteInfo"
      Structure attributes
      Type
      Note
      address
      string
      The address of the socket sending the message
      family
      string
      The protocol family in use, either IPv4 or IPv6.
      Port No.
      number
      Port No.
      size
      number
      The size of the message, measured in bytes.
      Structure attributes of "localInfo"
      Structure attributes
      Type
      Note
      address
      string
      The address of the socket sending the message
      family
      string
      The protocol family in use, either IPv4 or IPv6.
      Port No.
      number
      Port No.

      .offMessage

      This method is used via TCPSocket.offMessage(function listener).
      Feature Description: Removes the listener function of the event that is triggered when data is received.
      Parameter and Description: function listener, the listener function passed in by onMessage. If this parameter is not passed in, all listener functions will be removed.
      Sample Code
      const listener = function (res) { console.log(res) }
      
      TCPSocket.onMessage(listener)
      TCPSocket.offMessage(listener) // The same function object as the listener must be passed in.

      .onBindWifi

      This method is used via TCPSocket.onBindWifi(function listener).
      Feature Description: Monitors events triggered when a socket successfully binds to the current Wi-Fi network.
      Parameter and Description: function listener, the listener function for events triggered when a socket successfully binds to the current Wi-Fi network.

      .offBindWifi

      This method is used via TCPSocket.offBindWifi(function listener).
      Feature Description: Removes the listener function for events triggered when a socket successfully binds to the current Wi-Fi network.
      Parameters and Description: function listener, the listener function passed in by onBindWifi. If this parameter is not passed in, all listener functions will be removed.
      Sample Code
      const listener = function (res) { console.log(res) }
      
      TCPSocket.onBindWifi(listener)
      TCPSocket.offBindWifi(listener) // The same function object as the listener must be passed in.

      .write

      This method is used via TCPSocket.write(string|ArrayBuffer data).
      Feature Description: Sends data over the socket.
      Parameter and Description: string|ArrayBuffer data, the data to be sent.
      Sample Code
      const tcp = wx.createTCPSocket()  
      tcp.write('hello, how are you')
      
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