Action
Returns the port number of the peer.
Syntax
Result = GETDSTPort( socket)
Remarks
Result |
A WORD variable that is assigned with the port number of the peer or destination port number. |
Socket |
The socket number in the range from 0-3 |
When you are in server mode, it might be desirable to detect the port number of the connecting client.
You can use this for logging, security, etc.
See also
CONFIG TCPIP, GETSOCKET , SOCKETCONNECT, SOCKETSTAT , TCPWRITE, TCPWRITESTR, CLOSESOCKET , SOCKETLISTEN , GETDSTIP, URL2IP
Example
'-----------------------------------------------------------------------------------------
'name : servertest_TWI.bas
'copyright : (c) 1995-2025, MCS Electronics
'purpose : start the easytcp after the chip is programmed
' and create 2 connections
'micro : Mega88
'suited for demo : no
'commercial addon needed : yes
'-----------------------------------------------------------------------------------------
$regfile = "m88def.dat" ' specify the used micro
$crystal = 8000000 ' used crystal frequency
$baud = 19200 ' use baud rate
$hwstack = 128 ' default use 32 for the hardware stack
$swstack = 128 ' default use 10 for the SW stack
$framesize = 128 ' default use 40 for the frame space
' xram access
Print "Init , set IP to 192.168.1.70" ' display a message
Enable Interrupts ' before we use config tcpip , we need to enable the interrupts
Config Tcpip = Int1 , Mac = 12.128.12.34.56.78 , Ip = 192.168.1.70 , Submask = 255.255.255.0 , Gateway = 192.168.1.1 , Localport = 1000 , Tx = $55 , Rx = $55 , Chip = W5100 , Spi = 1
Dim Bclient As Byte ' socket number
Dim Idx As Byte
Dim Result As Word , Result2 As Word ' result
Dim S As String * 80
Dim Flags As Byte
Dim Peer As Long
Dim L As Long
Do
Waitms 1000
For Idx = 0 To 3
Result = Socketstat(idx , 0) ' get status
Select Case Result
Case Sock_established
If Flags.idx = 0 Then ' if we did not send a welcome message yet
Flags.idx = 1
Result = Tcpwrite(idx , "Hello from W3100A{013}{010}") ' send welcome
End If
Result = Socketstat(idx , Sel_recv) ' get number of bytes waiting
Print "Received : " ; Result
If Result > 0 Then
Do
Print "Result : " ; Result
Result = Tcpread(idx , S)
Print "Data from client: " ; Idx ; " " ; Result ; " " ; S
Peer = Getdstip(idx)
Print "Peer IP " ; Ip2str(peer)
Print "Peer port : " ; Getdstport(idx)
'you could analyse the string here and send an appropiate command
'only exit is recognized
If Lcase(s) = "exit" Then
Closesocket Idx
Elseif Lcase(s) = "time" Then
Result2 = Tcpwrite(idx , "12:00:00{013}{010}")' you should send date$ or time$
End If
Loop Until Result = 0
End If
Case Sock_close_wait
Print "close_wait"
Closesocket Idx
Case Sock_closed
Print "closed"
Bclient = Getsocket(idx , Sock_stream , 5000 , 64) ' get socket for server mode, specify port 5000
Print "Socket " ; Idx ; " " ; Bclient
Socketlisten Idx
Print "Result " ; Result
Flags.idx = 0 ' reset the hello message flag
Case Sock_listen ' this is normal
Case Else
Print "Socket status : " ; Result
End Select
Next
Loop
End