Function esp_idf_sys::esp_event_handler_instance_register

pub unsafe extern "C" fn esp_event_handler_instance_register(
    event_base: esp_event_base_t,
    event_id: i32,
    event_handler: esp_event_handler_t,
    event_handler_arg: *mut c_void,
    instance: *mut esp_event_handler_instance_t
) -> esp_err_t

@brief Register an instance of event handler to the default loop.

This function does the same as esp_event_handler_instance_register_with, except that it registers the handler to the default event loop.

@param[in] event_base the base ID of the event to register the handler for @param[in] event_id the ID of the event to register the handler for @param[in] event_handler the handler function which gets called when the event is dispatched @param[in] event_handler_arg data, aside from event data, that is passed to the handler when it is called @param[out] instance An event handler instance object related to the registered event handler and data, can be NULL. This needs to be kept if the specific callback instance should be unregistered before deleting the whole event loop. Registering the same event handler multiple times is possible and yields distinct instance objects. The data can be the same for all registrations. If no unregistration is needed, but the handler should be deleted when the event loop is deleted, instance can be NULL.

@note the event loop library does not maintain a copy of event_handler_arg, therefore the user should ensure that event_handler_arg still points to a valid location by the time the handler gets called

@return

• ESP_OK: Success
• ESP_ERR_NO_MEM: Cannot allocate memory for the handler
• ESP_ERR_INVALID_ARG: Invalid combination of event base and event ID or instance is NULL
• Others: Fail