/** \brief enable or disable gpe protocol
@param client_index - opaque cookie to identify the sender
@param context - sender context, to match reply w/ request
@param is_en - enable protocol if non-zero, else disable
*/
/** \brief enable or disable gpe protocol
@param client_index - opaque cookie to identify the sender
@param context - sender context, to match reply w/ request
@param is_en - enable protocol if non-zero, else disable
*/