Variable length not working?

[KPE]

/**@brief Attribute metadata. */
typedef struct
{
  ble_gap_conn_sec_mode_t read_perm;       /**< Read permissions. */
  ble_gap_conn_sec_mode_t write_perm;      /**< Write permissions. */
  uint8_t                 vlen       :1;   /**< Variable length attribute. */
  uint8_t                 vloc       :2;   /**< Value location, see @ref BLE_GATTS_VLOCS.*/
  uint8_t                 rd_auth    :1;   /**< Read Authorization and value will be requested from the application on every read operation. */ 
  uint8_t                 wr_auth    :1;   /**< Write Authorization will be requested from the application on every Write Request operation (but not Write Command). */
} ble_gatts_attr_md_t;

Whenever I set .vlen to true the softdevice fails with error 7 on the call to: sd_ble_gatts_characteristic_add

Is this functionality implemented, and are there any examples using it?

[KPE]

Ohh, and sorry for the mysterious memory dump, but I think this is the only way that I can back up my postings. You wouldn't get much out of looking at the code I use, as it is quite "alien" compared to plain C.

This is what I'm currently working at, and my guess it that it probably wouldn't make much sense:

class StandardInCD: public Characteristic<String20> {
public:
	StandardInCD(UUID uuid) : Characteristic(uuid, "StandardIn") {
		_handler_func = NULL;
		CharacteristicMetadata.Properties.SetWrite(true);
//		CharacteristicMetadata.GetUserDescriptorMetadata()->SetVariableLength(true);
		Metadata.SetVariableLength(true);
//		CharacteristicMetadata.GetUserDescriptorMetadata()->SetValueLocation(GattsAttributeMetadata::ValueLocation::Stack);
//		SetMaximumLength(20);
//		SetInitialLength(0);
	}

	virtual void OnValueWrittenEvent(ble_gatts_evt_write_t& writeEvent) {
		std::string stackstring((char*)writeEvent.data, writeEvent.len);
		TraceLine(stackstring.c_str());
		string result = s_Commands->ExecuteCommand(stackstring);
		TraceLine(result.c_str());
	}

	void SetValueHandlerFunc (std::function<void (uint8_t*, uint16_t length)> handler_func)
	{
		_handler_func = handler_func;
	}

private:
	std::function<void (uint8_t*, uint16_t length)> _handler_func;
};