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Functions of class afb_service
==============================
All the functions of the class **afb_daemon** use the default api.
This are internally aliased to the corresponding legacy function of
class **afb_api**.
```C
/**
* Calls the 'verb' of the 'api' with the arguments 'args' and 'verb' in the name of the binding.
* The result of the call is delivered to the 'callback' function with the 'callback_closure'.
*
* For convenience, the function calls 'json_object_put' for 'args'.
* Thus, in the case where 'args' should remain available after
* the function returns, the function 'json_object_get' shall be used.
*
* The 'callback' receives 3 arguments:
* 1. 'closure' the user defined closure pointer 'callback_closure',
* 2. 'status' a status being 0 on success or negative when an error occured,
* 2. 'result' the resulting data as a JSON object.
*
* @param api The api name of the method to call
* @param verb The verb name of the method to call
* @param args The arguments to pass to the method
* @param callback The to call on completion
* @param callback_closure The closure to pass to the callback
*
* @see also 'afb_req_subcall'
*/
void afb_service_call(
const char *api,
const char *verb,
struct json_object *args,
void (*callback)(void*closure, int status, struct json_object *result),
void *callback_closure);
/**
* Calls the 'verb' of the 'api' with the arguments 'args' and 'verb' in the name of the binding.
* 'result' will receive the response.
*
* For convenience, the function calls 'json_object_put' for 'args'.
* Thus, in the case where 'args' should remain available after
* the function returns, the function 'json_object_get' shall be used.
*
* @param api The api name of the method to call
* @param verb The verb name of the method to call
* @param args The arguments to pass to the method
* @param result Where to store the result - should call json_object_put on it -
*
* @returns 0 in case of success or a negative value in case of error.
*
* @see also 'afb_req_subcall'
*/
int afb_service_call_sync(
const char *api,
const char *verb,
struct json_object *args,
struct json_object **result);
```
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