Doing things in a callback routine

Hi,

In a callback routine for netsnmp_register_int_instance() I would like 
to be able to do things like turn on a kettle.

My problem is that in the callback I don't know if it's a GET or a SET.

Also, if turning on the kettle failed, how can I convey that failure 
back to the SET operation?


For example If I have this:
     netsnmp_register_int_instance("my example int variable",
                                   my_registration_oid,
                                   OID_LENGTH(my_registration_oid),
                                   &example1, my_callback_function);

Then in my_callback_function:

void my_callback_function(void) {
     /* Here is where I want to know if its a GET or a SET */
     /* If SET: set kettle to value X */
}

Similarly, how would I be able to read the temperature of the kettle 
on-the-fly with a GET. It seems that the callback routine is called 
almost as an afterthought.

Many thanks,
Thomas

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