please a sample with timer and TRY catch

[Silvio.Falconi]

I have a timer

DEFINE TIMER oTimer INTERVAL 500 OF oWnd ;
ACTION ( nTime++, if ( nTime == 4, UpdateSendReceive(), ))
ACTIVATE TIMER oTimer

on UpdateSendReceive() must call some function but it not run well

Code: Select all  Expand view  RUN

function UpdateSendReceive()
local nReC
if ! lWorking
   //nReC:=TGMSGS->(recno())
   sysrefresh()
TRY
   if isinternet()
      if oTimer:nInterval=5000
         oTimer:nInterval=1500
         ntime:=0
      endif
      lWorking = .T.
      ReadMessage()
      sysrefresh()
    *  replymsgAdmin()
    *  sysrefresh()
      ReplyMsg()
      sysrefresh()
   else
    if oTimer:nInterval#5000
       oTimer:nInterval=5000
       ntime:=0
    endif
 endif

  SELECT MS
       MS->(OrdSetFocus(1))   //TAG "UpdtId"
       MS->(DbGoTop())

   oBrw:setfocus()
   obrw:Refresh()

   lWorking = .F.

CATCH oError
   oErr:=.t.
end
endif
sysrefresh()

return nil
 

I wish on each 1500 second it call UpdateSendReceive()
How i resolve ?