B4X

Bind and Listen for Incoming Connections

Demonstrates Socket.BindAndListen, which binds a TCP listener to a port and places it into listening mode, then accepts an incoming connection.

Background. The backlog argument bounds the queue of pending connections. When ClientIpAddress is empty, the listener binds to all interfaces. After listening, call AcceptNext to accept connections.

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Dim success As Boolean = False

Dim socket As ChilkatSocket
socket.Initialize("socket")

'  Bind a TCP listener to a port and place it into listening mode.  The 2nd argument is the backlog,
'  the maximum number of pending connections allowed to queue.
success = socket.BindAndListen(5000, 25)
If success = False Then
    Log(socket.LastErrorText)
    Return
End If


'  After the listener is established, accept the next incoming connection into a new Socket.
Dim connectedSock As ChilkatSocket
connectedSock.Initialize("connectedSock")
success = socket.AcceptNext(20000, connectedSock)
If success = False Then
    Log(socket.LastErrorText)
    Return
End If

Log("Accepted a connection.")