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   tp_sendsub() - send part of string

   nSent := tp_sendsub(nPort, cString, nStart, [nLength], [nTimeout])

   nPort       Serial port number.
   cString     String to send.
   nStart      Starting position in string.
   nLength     Number of characters to send.
   nTimeout    Maximum wait time, in seconds.

   Returns     Number of characters sent.

   Sends part of a string to the serial port.  This is equivalent to:

       tp_send(nPort, substr(cString, nStart, nLength), nTimeout)

   tp_sendsub() is faster and does not cause as much memory
   fragmentation.

   Example:

       cCommand := "ATZ" + chr(13) + chr(10)
       for i := 1 to len(cCommand)
           tp_sendsub(1, cCommand, i, 1)
           tp_delay(0.05)
       next