98    global svghmi_session

    98     global svghmi_session

    99    size = ctypes.c_uint32()

    99     size = ctypes.c_uint32()

   100    ptr = ctypes.c_void_p()

   100     ptr = ctypes.c_void_p()

   101    res = 0

   101     res = 0

   102    while True:

   102     while True:

   103        res=svghmi_send_collect(ctypes.byref(size), ctypes.byref(ptr))

   103         res=svghmi_send_collect(ctypes.byref(size), ctypes.byref(ptr))

   104        if res == 0:

   104         if res == 0:

   105            # TODO multiclient : dispatch to sessions

   105             # TODO multiclient : dispatch to sessions

   106            if svghmi_session is not None:

   106             if svghmi_session is not None:

   107                svghmi_session.sendMessage(ctypes.string_at(ptr.value,size.value))

   107                 svghmi_session.sendMessage(ctypes.string_at(ptr.value,size.value))

   108        elif res not in [errno.EAGAIN, errno.ENODATA]:

   108         elif res == errno.ENODATA:

   109            break

   109             # this happens when there is no data after wakeup

   110             # because of hmi data refresh period longer than PLC common ticktime

   111             pass 

   112         else:

   113             # this happens when finishing

   114             break