Consumer client and rd_kafka_conf_set_error_cb

[andreamartini]

I'm using c++ librdkafka 2.3.0.
I created a simple client consumer for kafka. I would like to test if my client consumer is able to intercept error like network connection lost and so on.
To do that, i use two callbacks in this way:

 bool CKafkaTestConsumer::Init()
 {
 bool bValue=false;
 ...
  _rkConfiguration = rd_kafka_conf_new();		// rd_kafka_conf_t* _rkConfiguration: declared in header file
  rd_kafka_conf_set_error_cb(_rkConfiguration, CKafkaTestConsumer::_errorCallback);
  rd_kafka_conf_set_log_cb(_rkConfiguration, CKafkaTestConsumer::_loggerCallback);
  
  ...
  return bValue;
  }
  
  /*static method*/
  void CKafkaTestConsumer::_loggerCallback(const rd_kafka_t* rk, int level, const char* fac, const char* buf)
{
	...
	
	 rd_kafka_resp_err_t lastError = rd_kafka_last_error();    // return NO ERROR
	 ...
}
  /*static method*/
void CKafkaTestConsumer::_errorCallback(rd_kafka_t* rk, int err, const char* reason, void* opaque)
{	...
}

After i disconnect network cable(to cause network error), client invokes method CKafkaTestConsumer::_loggerCallback, but no CKafkaTestConsumer::_errorCallback.
Unfortunally in CKafkaTestConsumer::_loggerCallback i have no error detection. I have to parse const char* buf to understand error type.

My questions are:

1. Can my consumer client invoke _errorCallback in case of (network) error? If yes, how?
2. If previous point is not possible, can i retrieve error type in _loggerCallback ?

thank you in advance.
Kind regards