Keep Alive code for WiFi

Here we have a very simple example of how to make sure the wireless AP does not drop the connection when in extended idle state.  What the code is doing is to periodically

dim ka_counter as byte=0  'counter for keep alive

'This is the code for setting up the socket
sub on_sys_init()
    sock.num=4
    sock.rxbuffrq(1)
    sock.txbuffrq(1)
    sock.protocol=PL_SOCK_PROTOCOL_UDP
    sock.localportlist="10000"
    sock.allowedinterfaces="WLN"
    sock.targetbcast =YES
    sock.inconmode=PL_SOCK_INCONMODE_ANY_IP_ANY_PORT
    sock.reconmode=PL_SOCK_RECONMODE_0
end sub

'this is the code that you use for sending out the broadcast packet,

sub on_sys_timer
    if ka_counter=120 then
        sock.num=4
        sock.targetinterface = PL_SOCK_INTERFACE_WLN
        sock.targetip = "255.255.255.255"
        sock.targetport=10000
        sock.setdata("1")
        sock.send
        sock.connect
        
        ka_counter=0
    else
        ka_counter=ka_counter+1
    end if
end sub